Doing Math On Tables
Oct 26, 2004
Hello everyone:
I have a database for one of my websites, a picture rating site. Anyways, right now there are quicte a few tables, and I was wondering how to give the server a break and was wondering if this was possible:
Basicly I have a members table, and a votes table. Members will rate other users pcitures on a scale of one to ten, then the votes will be inserted into the votes table. The only problem with this is that calcuating all the votes a user has can put a straing on the server. I was wondering if it would be possible to create a math column in the members table that would automaticly figure out the users average and having it stored in a field in the members table, so all I would have to do is query the members average located in the mebers table, rather than tallying all the votes in the votes table for each member.
Hope this makes sense, a tutorial or any suggestions would be great!
Thanks
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Dec 13, 2006
in the below sql why is year(classdate) " + " a " + " MONTH(classdate) a math command giving me 2006 - 12 = 167
and not "2006/12" as text? please help me
cmdGetCat = New SqlDataAdapter("SELECT DISTINCT year(classdate) " + " a " + " MONTH(classdate) AS monthcode FROM dbo.classT INNER JOIN dbo.classgiven ON dbo.classT.classcode = dbo.classgiven.classcode WHERE (dbo.classT.discount = '-1') AND (dbo.classT.coned IS NOT NULL) ", conNorthwind)
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Nov 18, 2007
How do i update a sql table so that the result cannot be less than zero?for example, lets say I have the column "Number"I have a sql update statement that subtracts 1 from number:"Update oTable SET Number = (Number - 1)"Except that Number cannot be less than zero. Is there a way to do this in sql statement so that I don't have to have a select statement just to check that Number is greater than zero to begin with? Thanks
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Feb 2, 2004
I have 2 questions.
1) Lets say we have a table
CREATE TABLE TEST
(
N INT
)
These table have 10 records - the numbers from 1 to 10.
I need 1 query ONLY which will update the table and make it with 100 records - the numbers from 1 to 100.
2) How with 1 query ONLY i have select only the prime numbers
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Jan 16, 2006
I have some dates stored in a field named "visit"
In a select they show as the format:
2005-07-28 10:45:00.000
So I need to write a query that will select Visits that are more than 90 days old. I thought it might be something simple like:
Select * from patientVisit where ((getdate())-Visit>90)
But that is pulling all visits not just 90 day old ones.
How do I pull the current date/time and compute the cutoff date time that would be 90 days prior for my selection Where clause?
Thanks
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Jun 30, 2006
I need to create a new column where I subtract one column by another.
I've been looking fo that for a while now, can someone explain how to do this?
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Mar 31, 2006
Hi,How to find the list of SQL math functions in SQL Server 2005?ThanksKai
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Nov 23, 2006
select convert(float,'1.2334e+006')1233400.0select convert(decimal(20,2),'1.2334e+006')Server: Msg 8114, Level 16, State 5, Line 1Error converting data type varchar to numeric.can I set some options arithabort etc to have a workaround to thisproblem?Thanks.
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Dec 1, 2007
I'm not a professional dba or dbd, but I'm proficient in the basics ofdatabase design and sql. I want to create a database of mathdefinitions, and I'm wondering how one would go about creating adatabase that contains mathematical notation (and I'm not just talkingabout basic symbols where I could get away with ascii code). I needto be able to insert a wide variety of mathematical expressions, fromfractions to integrals, into fields (just like you can enter in-linemath symbols in MS Word using equation editor). I have no clue how togo about this. Is it a matter of developing certain programmingskills/languages? Would such a capabliltiy be proprietary (dbms-specific)? Is it possible at all? Any help would be appreciated.Thank you.
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Jul 20, 2005
Hi AllI'm trying to find a math function (if it exists) in SQL Server. If itdoesnt exist, then maybe someone can tell me what its called so I cando a bit more reading on itBasically I want to do this:Parameter Components1 12 23 1, 24 45 1, 46 2, 47 3, 48 89 1, 8and so onI'd like to be able to call a function and it would return true orfalse like sofunctionname(1, 9) = trueso 1 is a component of 9functionname(2, 9) = falseso 2 is not a component of 9functionname(4, 5) = trueso 4 is a component of 5If anyone could tell me if it exists in C#, VB.NET, VB6 or VBScript,I'd appreciate it!Thanks in advanceSam
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Jan 9, 2008
Below is my table layout, query, and results. I need to perform some date math to display how much time is elapsed between locations as patients are checked into each care_unit. I believe I could use the unique careunit_key but am not sure how to go about this.
[srm].[CDMAB_CAREUNITS]
[CAREUNIT_KEY] [decimal](37, 0) NOT NULL,
[EPISODE_KEY] [decimal](38, 0) NULL,
[CARE_UNIT] [char](20) NULL,
[ROOM_NO] [char](5) NULL,
[BED_NO] [char](5) NULL,
[DATE_IN] [datetime] NULL,
[TIME_IN] [char](6) NULL
select
cu.careunit_key,
cu.care_unit,
convert(nvarchar,e.ADMISSION_DATE, 101) as Admit_Date,
convert(nvarchar,e.EPISODE_DATE, 101) as Discharge_Date,
convert(nvarchar,cu.date_in,101) as date_in,
substring(cu.time_in, 1,5) as time_in,
convert(nvarchar,cu.date_in,101) +
convert(datetime,substring(cu.time_in, 1,5)) as date_time_in
FROM srm.episodes e
inner join srm.CDMAB_CAREUNITS cu on cu.episode_key = e.episode_key
inner join srm.item_header ih on ih.item_key = e.episode_key
inner join srm.patients p on p.patient_key = ih.logical_parent_key
where e.account_number = '11111777777'
CAREUNIT_KEY
CARE_UNIT
ADMIT_DATE
DISCHARGE_DATE
DATE_IN
TIME_IN
DATE_TIME_IN
1488831
3
12/10/2007
12/11/2007
12/10/2007
3:00
12/10/07 3:00
1498258
S4C
12/10/2007
12/11/2007
12/10/2007
5:54
12/10/07 5:54
1498406
SREC
12/10/2007
12/11/2007
12/10/2007
11:05
12/10/07 11:05
1498472
S6W
12/10/2007
12/11/2007
12/10/2007
12:37
12/10/07 12:37
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Apr 19, 2007
Good day all
Does anyone know if there is such a quary that can be written which would add up(or any math functions) a line of cells (on different rows) similar to that of working with a excel document?
If so please steer me towards the correct syntax for this.
Regards
Rob
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Mar 12, 2008
Hi,
I have a column coming from DB2. It is the time is stored as 6 decimals of a second. So the value I got coming in is 44846(DT_I8), which needs to be divided by 60 to get minutes (747 minutes remainder 26 seconds). Then divide 747 by 60 to get 12 hours remainder 27 minutes. Thus the time is 12:27:26.
I have got a dervived column doing (DT_R8)(SUBSTRING((DT_WSTR,8)PSCCLOGTIM,1,5)) / 60 but the answer I am getting out is 747.433333. Close, but not close enough. Now I assume my problem has something to do with the Math being done on actual numbers not Time based numbers.
Anyone got any ideas on where I am going wrong and what the expression should look like?
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Mar 28, 2007
I have been trying to make a database that counts up and down votes (like eBay ratings or reddit votes). I think (hope) I have got the database design right.
I know that you can perform math functions in SQL, but I want to use two COUNT()s from the same table and subtract one (the down votes) from the other (the up votes).
I have been learning ASP.NET 2.0 and it's going well, but I really need help with this. I asked a question on this forum before and the answers were great and really helpful.
If anyone can help that would be great. Thank you.
Jack.
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Nov 19, 2003
I need to perform some division on the results of two alias columns that perform counts in a query. What is the best way to do this?
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Jul 20, 2005
The business rule is, the sales manager is commissioned on the avg. numberof appointments set up per salesrep per day during the month.I have 2 tables: The UserLog table records only 1 entry per day per user(salesrep). This will log how many salesreps worked a particular day. Thesecond table logs any appointments set up.UserLog: ID, UserName, EnteredTimeAppointment: ApptID, EnteredTime, ApptDateI figured that, for a given date ranged, I could1. sum the number of appointments2. sum the number of days worked2. sum the salesreps / number of days = avg number of salesreps per day3. number of appointments / avg number of salesreps per day = avg numberof appointments per sales repBut this logic is flawed. If I average out every day and then take anaverage of this daily average, I get a different result. Any ideas on howto best solve this problem?Thanks.
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Dec 6, 2007
To set the stage, Tables are set up as such for this question:
-----------
Table: Answers
ID - Integer - Auto
Answer - Integer
QuestionID - Integer - FK from the QuizMaster table
StudentID - Integer - FK from the Students table
Table: QuizMaster
ID - Integer - Auto
Answer - Integer
Table: Students
ID - Integer - Auto
StudentName - Varchar(50)
----------
I would like to have an either a sql statement (1st) or a stored procedure (2nd) that would give me the percent correct for each student on the test.
In Access I could cheat and use this:
Code BlockSELECT Students.StudentName,
Count(Students.StudentName) AS TotalCorrect,
(SELECT Count(QuizMaster.ID) FROM QuizMaster;) AS TotalQuestions,
([TotalCorrect])/([TotalQuestions])*100 AS PercentValue
FROM (Answers INNER JOIN Students
ON Answers.StudentID = Students.ID)
INNER JOIN QuizMaster
ON (Answers.Answer = QuizMaster.Answer)
AND (Answers.QuestionID = QuizMaster.ID)
GROUP BY Students.StudentName
ORDER BY Students.StudentName, PercentValue;
Which is composed of the following...
Code Block
SELECT Students.StudentName,
Count(Students.StudentName) AS TotalCorrect
FROM (Answers INNER JOIN Students
ON Answers.StudentID = Students.ID)
INNER JOIN QuizMaster
ON (Answers.Answer = QuizMaster.Answer)
AND (Answers.QuestionID = QuizMaster.ID)
GROUP BY Students.StudentName;
SELECT Count(QuizMaster.ID) AS TotalQuestions
FROM QuizMaster;
([TotalCorrect])/([TotalQuestions])*100 AS PercentValue
But... that wont fly in SQL Server...What would work without using temp tables?
What would be the EASIEST way to do this?
Another way someone suggested is:
Code BlockCREATE PROCEDURE GetStudentGradeByID @StudentID Integer
AS
BEGIN
DECLARE @TotalQuestionsAsked as Integer;
DECLARE @StudentName as VarChar(50);
DECLARE @QuestionsCorrect as Integer;
DECLARE @PercentCorrect as Float;
set @TotalQuestionsAsked = select COUNT(*)FROM QuizMaster;
set @StudentName = select StudentName from Students where ID = @StudentID;
set @QuestionsCorrect = select count(Answers.ID) from Answers LEFT JOIN QuizMaster on Answers.QuestionID = QuizMaster.ID where StudentID = @StudentID AND QuizMaster.Answer = Answers.Answer;
set @PercentCorrect = (CAST (@QuestionsCorrect AS FLOAT) / CAST (@TotalQuestionsAsked AS FLOAT)) * 100.0;
select @QuestionsCorrect as TotalCorrect, @StudentName as Student, @TotalQuestionsAsked as NumQuestions, @PercentCorrect as CorrectPct;
END
But I need this as a datasource for a datagrid that would show all students etc... so using a parameter isn't really what I want.
So... could a stored procedure work for this?
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Jan 29, 2008
hi,
declare @query1 varchar(1000)
declare @query2 varchar(1000)
set @query1 = 'select count(*) from table1'
set @query2 = 'select count(*) from table2'
select @query1 - @query2
basically, i want to show the difference of this 2 select statements.. how do i do it?
thanks in advance!
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Oct 2, 2007
The value in the table of one DB is 17869 sq. ft. Now to insert this value in a new table of other database the reporting basis is 1000 i.e I need to do 17869/1000 = 17.8 so I have to take the value as 18. Another thing to be kept in mind is the value in the new table should have leading Zeroes. If the value is 18 it should be displayed as 0000018 ( data type in new table is Varchar(7) and in old table char (9) ). What can be the best way to implement this??
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Sep 23, 2007
hi,
how can i make mathematical operations with the DateTime format from thw Sql? -- this is the format 9/6/2007 11:09:00 PM --
how can i substract 30 days from that date and know the resulting one?
if i have two dates, how can i know what number of hours and minutes are between them (if they are fewer than 24), or what number of days and hours and minutes are (if the difference is grater than 24 hours)
please help me, thanks
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Jun 17, 2008
Hello,
I have this column of time values:
00:00:03.3592675
00:00:00
00:00:03.8592515
00:00:03.6873820
00:00:03.8436270
00:00:03.3436430
It is in varchar format. I tried converting it to datetime but get an invalid format error message.
How can I sum up these values and average them out?
Thanks!
--PhB
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Mar 5, 2008
In reference to this thread:
http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=50392
madhivanan asks for sample table data to avoid using a cursor. I could really use this, so here is the table
CREATE TABLE #T (
FORMULA VARCHAR(15),
ANSWER decimal(15,8)
)
INSERT INTO #T SELECT '1', NULL
INSERT INTO #T SELECT '1.0 + 2', NULL
INSERT INTO #T SELECT '1/2', NULL
INSERT INTO #T SELECT '1/2+2', NULL
INSERT INTO #T SELECT '1/(2+2)',NULL
INSERT INTO #T SELECT '3*7.5', NULL
INSERT INTO #T SELECT '3/2*.6-2', NULL
INSERT INTO #T SELECT '(1-1)', NULL
SELECT * FROM #T
-- RUN THE MATH FUNCTIONS, UPDATE THE TABLE'S ANSWER COLUMN WITH THE ANSWER
SELECT * FROM #T
DROP TABLE #T
I would expect this output:
FORMULA ANSWER
====================
1 NULL
1.0 + 2 NULL
1/2 NULL
1/2+2 NULL
1/(2+2) NULL
3*7.5 NULL
3/2*.6-2 NULL
FORMULA ANSWER
====================
1 1.00000000
1.0 + 2 3.00000000
1/2 0.50000000
1/2+2 2.50000000
1/(2+2) 0.25000000
3*7.5 22.50000000
3/2*.6-2 -1.10000000
(1-1) 0.00000000
Any help appreciated, thanks,
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Jan 30, 2006
How do i implement this pseudocode in a SQL stored proc?
In my stored proc, intDS and intSS are the corresponding locally declared variables: @cnt1 and @cnt2 (both are int's).
double intRating = 0;
if (intDS != 0)
intRating = ((intDS - intSS ) / intDS) * 100;
if (intRating < 0)
intRating = 0;
intRating = RoundUpDown(intRating);
The last line should round up or downd the decimal value, if it has decimals, to the next round/whole number... e.g. 28.4352635 to 28.
Thank you!
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Jan 28, 2008
I realize this gets into business logic, but a DB based solution might be best. Possibly some pre-calculated measurement tables.
Business problem: Creating a cut list for a window covering (blinds) system. It's preferably a fast calculation I could execute while the user awaits "order confirmation and pricing". A .5 second delay per order would be acceptable.
An order can have unlimited number of line items, but typically between 1 and 20 (number of windows in a single house).
(For this problem) the raw material is man-made, and therefore is always the same length for a particular pattern/color (take 12' for this example; we stock patterns in 9', 12', or 16' but it's always the same for a given pattern/color). I need to tell the cutters how to use the rawmaterial with minimal waste. Note: The saw blade takes 1/16th inch.
For each line item; I have pre-calculated the exact cut size and number of slats. Measurements are in inches at 1/8 (.125) inch increments. The length of raw material length we stock for this pattern is an easy link.
The goal is to average less than 6 inches waste per 12' piece of raw material.
Example order:
5 line items for pattern/color FAUX/white, stocked in 12' lengths.
Line 1: 34 slats at 35.125 inches.
Line 2: 36 slats at 36.875 inches.
Line 3: 50 slats at 42 inches.
Line 4: 55 slats at 70 inches.
Line 5: 52 slats at 30 inches.
The resulting cut-list-workorder would evaluate all lines together and tell them how many 12' slats to pull and how to cut them with minimal material waste.
My question:
I'm left wondering if a database style pre-populated answer list (or some other database based solution) might be a lot faster and simpler than some chess-style complex trial-and-error array based VB algorythm (that I haven't even begun to imagine how to write). If so; how would it look?
In addition; the cutters get something like $10/hr so we can't make it too complex. I'd rather waste a little material and avoid undue confusion, but not much. With $5+ million in this material per year, excess waste can really add up. Imagine the difference between 12% and 15% waste. It's an area worth investing in.
Sorry; I know it's not a simple question. Someone might find it interesting enough to solve, or at least provide hope for a DB solution. At present; I just can't imagine it.
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Oct 20, 2005
Christine the Pharmacist writes "Please pardon as I am not horribly advanced with SQL...
Using SQL Server 2000, Windows 2000, Service pack 4
I'm trying to figure out marketshares for "preferred" products. I have a table put together by hospital and month of medication use with the totals of each drug dispensed in columns as well.
(example table below)
Hospital Month Drug A Drug B Drug C Drug D
A 7 5 10 58 73
B 7 NULL 26 98 43
etc.
** Drug C and Drug D are the preferred drugs
I'm getting correct preferred % in all cases except when a value is NULL (result is NULL). I'm using an aggregate (sum), which should ignore NULLs, but it ignores NULLs within a column, and not ignoring across columns. I've tried setting concat_null_yields_null off and I'm still getting NULL (since I'm using the plus sign).
This is my admittedly confused select statement, suspect this is where my problem lies (problems with saying "sum", but using "+" as well?):
select a.Hospital,a.month,convert(float,sum(c.Drug_C+d.Drug_D))/convert(float,sum(a.Drug_A+b.Drug_B+
c.Drug_C+d.Drug_D)) as preferred_share
Thanks for any advice!"
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Feb 25, 2015
I want to evaluate a math formula inside of a function, so I can't use dynamic SQL.
I found that the query on an XML-variable with a literal works well.
DECLARE @sParsedFormula varchar(200);
DECLARE @xFormula xml;
SET @xFormula = '';
SET @sParsedFormula = '1+2';
SELECT @xFormula.query('3+3') , @xFormula.query('sql:variable("@sParsedFormula")')Output (1st value is correctly evaluated, 2nd not):
"6", "1+2"
I can't directly pass @sParsedFormula to the query otherwise I get "The argument 1 of the XML data type method "query" must be a string literal". What is the correct XQuery-syntax to evaluate the SQL:variable?
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Feb 20, 2007
Using a reporting services model/report builder we have two related tables:
- Fundings, (parent)
- Draws, (child)
Report Builder reports that subtract "Total Fundings.Amount", (which is SUM(FundingAmount)) from "Total Draw Amount", (which is SUM(DrawAmount)) to get a balance work as expected except when there are no Draw rows, in which case a NULL is returned. Obviously we want to convert NULL values of "Total Draw Amount" to zero so that when subtracted from "Total Fundings.Amount" the correct value is displayed. I've searched for a function similar to COALESCE (Transact-SQL) in report builder but found nothing.
Can anybody help me with this?
Thanks
Bruce
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Oct 5, 2015
How Can I Create Two Column with Math Function In one Column Like Below.
Create Table Tbl_V_Voucher_Details
(
Id Int IDentity (1,1) Primary Key,
Catid Int Foreign Key References Tbl_V_Voucher_Info(Id),
ItemId Int Foreign Key References Tbl_V_Item(Id),
Discription varchar
(100),
Qty Int,
Price Float,
Qty * Price As Total
)
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Jan 24, 2008
I'm new to my company, although not new to SQL 2005 and I found something interesting. I don't have an ERD yet, and so I was asking a co-worker what table some data was in, they told me a table that is NOT in SQL Server 2005's list of tables, views or synonyms.
I thought that was strange, and so I searched over and over again and still I couldn't find it. Then I did a select statement the table that Access thinks exists and SQL Server does not show and to my shock, the select statement pulled in data!
So how did this happen? How can I find the object in SSMS folder listing of tables/views or whatever and what am I overlooking?
Thanks,
Keith
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Dec 7, 2006
We have 20 -30 normalized tables in our dartabase . Also we have 4tables where we store the calculated data fron those normalised tables.The Reason we have these 4 denormalised tables is when we try to dothe calcultion on the fly, our site becomes very slow. So We haveprecalculated and stored it in 4 tables.The Process we use to do the precalcultion, will get do thecalculation and and store it in a temp table. It will compare the thetemp with denormalised tables and insert new rows , delte the old oneans update if any changes.This process take about 20 mins - 60mins. Ittakes long time because in this process we first do the calculationregardless of changes and then do a compare to see what are changed andremove if any rows are deleted, and insert new rowsand update thechanges.Now we like to capture the rows/columns changed in the normalisedtables and do only those chages to the denormalised table , which weare hoping will reduce the processing time by atleast 50%WE have upgraded to SQL SERVER 2005.So We like to use the newtechnology for this process.I have to design the a model to capture the changes and updated onlythose changes.I have the list of normalised tables and te columns which will affectthe end results.I thought of using Triggers or OUTPUT clause to capture the changes.Please help me with the any ideas how to design the new process
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Oct 7, 2015
I am using the following select statement to get the row count from SQL linked server table.
SELECT Count(*) FROM OPENQUERY (CMSPROD, 'Select * From MHDLIB.MHSERV0P')
MHDLIB is the library name in IBM DB2 database. The above query gives me only the row count of table MHSERV0P. However, I need to get the names, rowcounts, and sizes of all tables that exist in MHDLIB librray. Is it possible at all?
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Feb 5, 2007
From Newbie to Newbie,
Add reference to:
'Microsoft ActiveX Data Objects 2.8 Library
'Microsoft ADO Ext.2.8 for DDL and Security
'Microsoft Jet and Replication Objects 2.6 Library
--------------------------------------------------------
Imports System.IO
Imports System.IO.File
Code Snippet
'BACKUP DATABASE
Public Shared Sub Restart()
End Sub
'You have to have a BackUps folder included into your release!
Private Sub BackUpDB_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BackUpDB.Click
Dim addtimestamp As String
Dim f As String
Dim z As String
Dim g As String
Dim Dialogbox1 As New Backupinfo
addtimestamp = Format(Now(), "_MMddyy_HHmm")
z = "C:Program FilesVSoftAppMissNewAppDB.mdb"
g = addtimestamp + ".mdb"
'Add timestamp and .mdb endging to NewAppDB
f = "C:Program FilesVSoftAppMissBackUpsNewAppDB" & g & ""
Try
File.Copy(z, f)
Catch ex As System.Exception
System.Windows.Forms.MessageBox.Show(ex.Message)
End Try
MsgBox("Backup completed succesfully.")
If Dialogbox1.ShowDialog = Windows.Forms.DialogResult.OK Then
End If
End Sub
Code Snippet
'RESTORE DATABASE
Private Sub RestoreDB_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles
RestoreDB.Click
Dim Filename As String
Dim Restart1 As New RestoreRestart
Dim overwrite As Boolean
overwrite = True
Dim xi As String
With OpenFileDialog1
.Filter = "Database files (*.mdb)|*.mdb|" & "All files|*.*"
If .ShowDialog() = Windows.Forms.DialogResult.OK Then
Filename = .FileName
'Strips restored database from the timestamp
xi = "C:Program FilesVSoftAppMissNewAppDB.mdb"
File.Copy(Filename, xi, overwrite)
End If
End With
'Notify user
MsgBox("Data restored successfully")
Restart()
If Restart1.ShowDialog = Windows.Forms.DialogResult.OK Then
Application.Restart()
End If
End Sub
Code Snippet
'CREATE NEW DATABASE
Private Sub CreateNewDB_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles
CreateNewDB.Click
Dim L As New DatabaseEraseWarning
Dim Cat As ADOX.Catalog
Cat = New ADOX.Catalog
Dim Restart2 As New NewDBRestart
If File.Exists("C:Program FilesVSoftAppMissNewAppDB.mdb") Then
If L.ShowDialog() = Windows.Forms.DialogResult.Cancel Then
Exit Sub
Else
File.Delete("C:Program FilesVSoftAppMissNewAppDB.mdb")
End If
End If
Cat.Create("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:Program FilesVSoftAppMissNewAppDB.mdb;
Jet OLEDB:Engine Type=5")
Dim Cn As ADODB.Connection
'Dim Cat As ADOX.Catalog
Dim Tablename As ADOX.Table
'Taylor these according to your need - add so many column as you need.
Dim col As ADOX.Column = New ADOX.Column
Dim col1 As ADOX.Column = New ADOX.Column
Dim col2 As ADOX.Column = New ADOX.Column
Dim col3 As ADOX.Column = New ADOX.Column
Dim col4 As ADOX.Column = New ADOX.Column
Dim col5 As ADOX.Column = New ADOX.Column
Dim col6 As ADOX.Column = New ADOX.Column
Dim col7 As ADOX.Column = New ADOX.Column
Dim col8 As ADOX.Column = New ADOX.Column
Cn = New ADODB.Connection
Cat = New ADOX.Catalog
Tablename = New ADOX.Table
'Open the connection
Cn.Open("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:Program FilesVSoftAppMissNewAppDB.mdb;Jet
OLEDB:Engine Type=5")
'Open the Catalog
Cat.ActiveConnection = Cn
'Create the table (you can name it anyway you want)
Tablename.Name = "Table1"
'Taylor according to your need - add so many column as you need. Watch for the DataType!
col.Name = "ID"
col.Type = ADOX.DataTypeEnum.adInteger
col1.Name = "MA"
col1.Type = ADOX.DataTypeEnum.adInteger
col1.Attributes = ADOX.ColumnAttributesEnum.adColNullable
col2.Name = "FName"
col2.Type = ADOX.DataTypeEnum.adVarWChar
col2.Attributes = ADOX.ColumnAttributesEnum.adColNullable
col3.Name = "LName"
col3.Type = ADOX.DataTypeEnum.adVarWChar
col3.Attributes = ADOX.ColumnAttributesEnum.adColNullable
col4.Name = "DOB"
col4.Type = ADOX.DataTypeEnum.adDate
col4.Attributes = ADOX.ColumnAttributesEnum.adColNullable
col5.Name = "Gender"
col5.Type = ADOX.DataTypeEnum.adVarWChar
col5.Attributes = ADOX.ColumnAttributesEnum.adColNullable
col6.Name = "Phone1"
col6.Type = ADOX.DataTypeEnum.adVarWChar
col6.Attributes = ADOX.ColumnAttributesEnum.adColNullable
col7.Name = "Phone2"
col7.Type = ADOX.DataTypeEnum.adVarWChar
col7.Attributes = ADOX.ColumnAttributesEnum.adColNullable
col8.Name = "Notes"
col8.Type = ADOX.DataTypeEnum.adVarWChar
col8.Attributes = ADOX.ColumnAttributesEnum.adColNullable
Tablename.Keys.Append("PrimaryKey", ADOX.KeyTypeEnum.adKeyPrimary, "ID")
'You have to append all your columns you have created above
Tablename.Columns.Append(col)
Tablename.Columns.Append(col1)
Tablename.Columns.Append(col2)
Tablename.Columns.Append(col3)
Tablename.Columns.Append(col4)
Tablename.Columns.Append(col5)
Tablename.Columns.Append(col6)
Tablename.Columns.Append(col7)
Tablename.Columns.Append(col8)
'Append the newly created table to the Tables Collection
Cat.Tables.Append(Tablename)
'User notification )
MsgBox("A new empty database was created successfully")
'clean up objects
Tablename = Nothing
Cat = Nothing
Cn.Close()
Cn = Nothing
'Restart application
If Restart2.ShowDialog() = Windows.Forms.DialogResult.OK Then
Application.Restart()
End If
End Sub
Code Snippet
'COMPACT DATABASE
Private Sub CompactDB_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles
CompactDB.Click
Dim JRO As JRO.JetEngine
JRO = New JRO.JetEngine
'The first source is the original, the second is the compacted database under an other name.
JRO.CompactDatabase("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:Program
FilesVSoftAppMissNewAppDB.mdb; Jet OLEDB:Engine Type=5", "Provider=Microsoft.Jet.OLEDB.4.0;
Data Source=C:Program FilesVSoftAppMissNewAppDBComp.mdb; JetOLEDB:Engine Type=5")
'Original (not compacted database is deleted)
File.Delete("C:Program FilesVSoftAppMissNewAppDB.mdb")
'Compacted database is renamed to the original databas's neme.
Rename("C:Program FilesVSoftAppMissNewAppDBComp.mdb", "C:Program FilesVSoftAppMissNewAppDB.mdb")
'User notification
MsgBox("The database was compacted successfully")
End Sub
End Class
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Jul 20, 2005
I'm working on an ASP.Net project where I want to test code on a localmachine using a local database as a back-end, and then export it tothe production machine where it uses the hosting provider's SQL Serverdatabase on the back-end. Is there a way to export tables from oneSQL Server database to another in such a way that if a table alreadyexists in the destination database, it will be updated to reflect thechanges to the local table, without existing data in the destinationtable being lost? e.g. suppose I change some tables in my localdatabase by adding new fields. Can I "export" these changes to thedestination database so that the new fields will be added to thedestination tables (and filled in with default values), without losingdata in the destination tables?If I run the DTS Import/Export Wizard that comes with SQL Server andchoose "Copy table(s) and view(s) from the source database" and choosethe tables I want to copy, there is apparently no option *not* to copythe data, and since I don't want to copy the data, that choice doesn'twork. If instead of "Copy table(s) and view(s) from the sourcedatabase", I choose "Copy objects and data between SQL Serverdatabases", then on the following options I can uncheck the "CopyData" box to prevent data being copied. But for the "CreateDestination Objects" choices, I have to uncheck "Drop destinationobjects first" since I don't want to lose the existing data. But whenI uncheck that and try to do the copy, I get collisions between theproperties of the local table and the existing destination table,e.g.:"Table 'wbuser' already has a primary key defined on it."Is there no way to do what I want using the DTS Import/Export Wizard?Can it be done some other way?-Bennett
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