I have several tables where I have used the command
distinct first_name, last_name, dob
to unduplicate.
I was wondering if I could create a new column in my table that combines the existing records for first_name, last_name and dob?
Can someone help me create a composite key on ms sql server through the enterprise manager?
Thanks,
Laura
Hi
I'm trying to create a composite Primary Key on a table. This is the SQL I've written:
CREATE TABLE BookingItems
(
BookingID INT NOT NULL
REFERENCES Bookings(BookingID),
EquipmentTypeID INT NOT NULL
REFERENCES EquipmentType(EquipmentTypeID),
CONSTRAINT PK_BookingItems_id PRIMARY KEY
(BookingID, EquipmentTypeID)
)
Is this right? I'm trying to define a Primary Key made up of BookingID and EquipmentTypesID, which are both Foreign Keys as defined in the column definition.
Thanks
Jon
Made an interesting discovery today - a column of data type Bit is not allowed to participate in composite key. Rather surprised.
I have a certain unique code that exhibits 2 unique states, which rendered the use of the boolean column, so the uniqueness goes <code>-1 and <code>-0. Is there any 'hack' so to speak to avoid using a Tinyint for the boolean column instead?
Hello,
I have a table which has a composite primary key consisting of four columns, one of them being a datetime called Day.
The nice thing afaik with this composite key is that it prevents duplicate entries in the table for any given day. But the problem is probably two-fold
1. multiple columns need to be used for joins and I think this might degrade performance?
2. in client applications such as asp.net these primary keys must be sent in the query string and the query string becomes long and a little bit unmanagable.
A possible solutions I'm thinking of is dropping the existing primary key and creating a new identity column and a composite unique index on the columns from the existing composite key.
I would like to have some tips, recommendations and alternatives for what I should do in this case.
Hi All!I would like to have a composite PK on 3 columns, one of them is nullCREATE TABLE TableA (ColA int NOT NULL ,ColB int NOT NULL ,ColC char (3) NULL ,......)GOALTER TABLE TableA ADDCONSTRAINT TableA_PK PRIMARY KEY CLUSTERED(ColA,ColB,ColC)GOSQL Server does not allow having a composite PK with one nullable column:What is wrong to have values?1,100,NULL1,200,ABC1,200,ABD.....Code in C applies to Values in B and for some values in B the code does not exist.I can work out and define a special Code:NEV(not existing value), but in general I do not understand this restriction.Thanks
View 3 Replies View RelatedHow do I improve a 3 column, composite clustered index on a large table when the developer insists there is no other way to achieve uniqueness? They say a uniqueindentifier column will not work.
View 5 Replies View RelatedHi,I created a composite index (lastname, firstname). I know the followingqueries will use this index:WHERE lastname = ...WHERE lastname = ... AND firstname = ...Also this won't use the index:WHERE firstname = ...But how about: WHERE firstname = .. AND lastname = ...And why?Thanks a lot,Baihao--Posted via Mailgate.ORG Server - http://www.Mailgate.ORG
View 13 Replies View RelatedWant to check my thinking with you folks...
I have a table with a clustered composite index, consisting of 3 columns, which together form a unique key. For illustration, the columns are C1, C2 & C3.
Counts of distinct values for columns are C1 425, C2 300,000 & C3 4,000,000
C3 is effectively number of seconds since 01/01/1970.
The usage of the table is typically, insert a row, do something else, then update it.
Currently, the index columns are ordered C3,C1,C2. Fill factor of 90%.
My thinking is that this composite index is better ordered C1,C2,C3.
My reasoning is that having C3 as the leading column, biases all the inserts towards one side of the indexes underlying B-tree, causing page splits. Also, there'll be a bunch of "wasted" space across the tree, as the values going into C3 only ever get bigger (like an identity), so the space due to the fill factor in lower values never gets used.
Welcome your thoughts.
I created composite clustered index key based on Gender and Salary column
The Query executed Successfully and <g class="gr_ gr_135 gr-alert gr_tiny gr_spell undefined ContextualSpelling multiReplace" data-gr-id="135" id="135">i</g>
got composite index key id Gender(-), Salary I <g class="gr_ gr_310 gr-alert gr_gramm undefined Grammar only-ins replaceWithoutSep" data-gr-id="310" id="310">want</g> know why Gender(-) display like this?
And Gender is <g class="gr_ gr_391 gr-alert gr_spell undefined ContextualSpelling ins-del multiReplace" data-gr-id="391" id="391">nvarchar</g> (20)
Hi,
I am trying to create a inline function which is listed below.
USE [Northwind]
SET ANSI_NULLS ON
GO
CREATE FUNCTION newIdentity()
RETURNS TABLE
AS
RETURN
(SELECT ident_current('orders'))
GO
while executing this function in sql server 2005 my get this error
CREATE FUNCTION failed because a column name is not specified for column 1.
Pleae help me to fix this error
thanks
Purnima
Is there a way for me to create a column in SQL?
What Im looking to do is create a view with columns from a specific table. In addition to this I would like to append a column to the view which would contain data based on the data from a pre-existing column.
Table AColumn 1Column 2Column 3
View AColumn 1Column 2Column 3Column 4
Now here is the Row structureColumn 1 Column 2 Column 3 Column 4Test Test A ONTest Test B OFF
So if Column 3 contains "A" as its field data than Column 4 will contain "ON" and if Column 3 contains "B" than Column 4 will contain "OFF"
Is this possible?
TIA,
Stue.
I have a ACTION column. i.e Its only disply SELL/BUY.
ACTION
BUY
BUY
BUY
SELL
SELL
SELL
SELL
BUY
BUY
SELL
SELL
SELL
BUY
How to create another column display like this
ACTION
BUY 1
BUY 2
BUY 3
SELL 1
SELL 2
SELL 3
SELL 4
BUY 1
BUY 2
SELL 1
SELL 2
SELL 3
BUY 1
Help me anyone...
I have a ACTION column. i.e Its only disply SELL/BUY.
ACTION
BUY
BUY
BUY
SELL
SELL
SELL
SELL
BUY
BUY
SELL
SELL
SELL
BUY
How to create another column display like this
ACTION
BUY 1
BUY 2
BUY 3
SELL 1
SELL 2
SELL 3
SELL 4
BUY 1
BUY 2
SELL 1
SELL 2
SELL 3
BUY 1
Help me anyone...
I'm using SQL Server 2008 to solve the following exercise.
I have three Tables:
Table CUSTOMER with columns: CustomerID,Company,ContactName,Phone
Table ORDER with columns: OrderID,OrderDate,ShippedDate,ShipperID,Freight,CustomerID
Table Shipper with columns:ShipperID,Company,Phone
I need to Create a view listing the shipper and the number of unshipped orders. I have been trying to use joins or possibly subqueries, but I'm not getting a correct result for a ShipperID with NO unshipped orders.My view should looks like: ShipperID, Company, Phone, UnshippedOrders
I have created new columns fields in a table using EManager. However, I am wondering Which command do we use to create columns through the analyser??? Is it the same like the "Insert into"?
View 3 Replies View RelatedI have a table that looks like this:
id, x
1 9.5
2 10
3 11
...
n x
and what I would like is to update this table with the differences of values in the x column (x[2]-x[1]) where the first difference would just be defined as 0.
result table would look like this:
id, x, dx
1 9.5 0 (where dx[1] defined to be 0)
2 10 0.5 (where dx[2] = 10-9.5 = 0.5)
3 11 1.0 (where dx[3]= 11-10 = 1.0)
...
Any suggestions on the best way to do this?
Hello,
I'm just using SSIS to build my first data warehouse. I've read quite a bit, but I'm stuck at the very first task: I need to assign a key column (just an int that starts at 1 and basically numbers the rows). What transformation do I use? I was going to use the derived column, but if that's the case, I don't know the script for the expression to do it. If I'm right, would someone mind supplying that also?
Thanks a lot,
Andy
Hi,Good morning to All.
I have some doubt.I cannot do anything without knowing the reason why we are doing that particular thing.
Any way, my doubt is:
While creating table, in some places I see COLLATE clause.
For example, recently I have seen this.
CREATE TABLE dbo.OrderDetails( OrderDetailID INT IDENTITY(1,1) NOT NULL, ItemNumber VARCHAR(20) COLLATE SQL_Latin1_General_CP1_CI_As NULL, Qty INT NULL)ON [PRIMARY]
In the above table, why the Collate clause for ItemNumber column? What is the advantage with that clause?I have seen sql server help for this. I have found 1011 results for the query SELECT * FROM fn_helpcollations().Then I searched for SQL_Latin related collations using: SELECT * FROM fn_helpcollations() where name like 'SQL_Latin%'I have found 31 results.How can I know which clause i have to use for which type of query?
Can anybody please tell answers for all these doubts?
Thanks in advance.
Regards,Ashok kumar.
I need a view that will:
1) select the distinct values in a column (the easy part)
2) assign the equivalent of an identity column to each row containing the distinct value it returns.
For example TableA contains 25 records but one of the columns only contains three unique values (say, 'A','B', & 'C').
This is what I want my view to return:
1 A
2 B
3 C
In other words, I need the view to assign the 1, 2 and 3 to the individual rows.
Thanks in advance for any pointers on this one.
creating a custom column that will put a list of 5 values for each unique value(or in this case Employee).
So I have a Employee table were I pull a list of all active employees -
Example -
024Swanson, Ronrswanson@tv.com
026Donaughy, Jackjdonaughy@tv.com
028Scott, Michaelsmichael@tv.com
What I want to do is add a column that has 5 values and create a row for each value
I want it too look like this -
024Swanson, Ronrswanson@tv.com a
024Swanson, Ronrswanson@tv.com b
024Swanson, Ronrswanson@tv.com c
024Swanson, Ronrswanson@tv.com d
024Swanson, Ronrswanson@tv.com e
[Code] ....
Currently all my query looks like is this -
SELECT EmpID, LastFirst, Email
FROM dbo.EmpList
WHERE (Active = 1)
hi,i am a beginner to ms sql server2000i have a tablecreate table ddd (a int, b int)by table structure is a bnow when i enter a value in b column suppose '2' in column bbext time when i insert a value in the column a i have to get the valuein b as 3 is thi spossible with triggersinsert into gdg values (1,2)a b1 2insert into gdg (a) values(2)a b2 3----------------> i have to get this 3 automaticallyis there any method to get thispls help mesatish
View 1 Replies View RelatedHello,
I am trying to recreate a primary key that I dropped in a table....
I'm using a statement like
ALTER TABLE temp WITH NOCHECK add CONSTRAINT PK__tempkey PRIMARY KEY CLUSTERED
(
num,
store
)
But apparently the "store" column was created without a "not null" and it let it create the PK during the table creation but now it won't let me add the PK with that nullable column..
Does anyone know how to get it to use that column to create a primary key after the initial table creation?
Here is the error i get
Cannot define PRIMARY KEY constraint on nullable column in table
Thanks a lot
Hi!
How can I make a relation that would let me relate an employee to two departments?
There is a table with emloyees and each one works in a department and there is a foreign key relation in the child (employees) table to the parent (departments) table. So can an employee work in two departments? (it's not impossible to imagine, is it?) And how would I retrieve all the employees of a department?
Or in other words, if I were working on some kind of software for my local supermarket and they need to keep track of all bills they ever gave out. I would make this products table and this bills table. Then I would create a foreign key column in the products table and fill it with bill_ids from the bills table and make retrieving bill items a simple getchildrow[](bill_row). Note that this is only an analogy, I need it done this way. How? (using C# express 2005, and SQL express and DataSets)
Does column order matter when creating a table? For example, Should NOT NULL columns always come before NULL columns? Should most frequently used columns always be near the top? What about text, ntext and image data types? Should they always appear near the end of the column order?
View 1 Replies View RelatedHi Guys
I'm trying to create a view in SQL Server to display only one copy of all records in a table, where some of the records are exact matches to other records (except for an ID autoincrement field)
I have the following code that displays distinct titles:
sql Code:
Original
- sql Code
SELECT DISTINCT DocTitle
FROM dbo.TBL_TABLE_NAME
SELECT DISTINCT DocTitleFROM dbo.TBL_TABLE_NAME
But when i use this code (adding one field to query), it displays all the duplicate records also, which I do not want:
sql Code:
Original
- sql Code
SELECT DISTINCT DocTitle, ID
FROM dbo.TBL_TABLE_NAME
SELECT DISTINCT DocTitle, IDFROM dbo.TBL_TABLE_NAME
I want to get the distinct results for DocTitle, with 5 other columns added to the query so they can be displayed in a web page list.
The query I want is something like this, but I can not get it to work:
sql Code:
Original
- sql Code
SELECT DISTINCT DocTitle, ID, FirstName, LastName, Company, DocDescription, DocFile
FROM dbo.TBL_TABLE_NAME
ORDER BY DocTitle
SELECT DISTINCT DocTitle, ID, FirstName, LastName, Company, DocDescription, DocFileFROM dbo.TBL_TABLE_NAMEORDER BY DocTitle
I know this query works from an MS Access DB, but I need it to work from SQL Server.
I am using SQL Server 2000
Any help is greatly appreciated.
Alex
I have 5 million rows of table, and going to create Non Clustered Index for Datetime values column. Creating Non clustered Index on Datetime value column will affect performance or not.
View 4 Replies View RelatedI have a varchar column in a table, which is an unique key column. Now when I design this table should I use this column as a primary key or should I add one more Integer column as a primary key column for the performance?
One more point is, when ever I do a search on this table I will search based on that unique varchar column values only, so even then if I add new integer column just for Primary key I will not use this column for searching values.
With these information, can some body help me in deciding this?
This is a fairly simple question, but what is the easiest way to:create a new numbered column (where value is simply the row number) inan existing table and setting it as a primary key?
View 1 Replies View Related
Hi all,
My code below creates a trigger that fires whenever a change occurs to a 'myTable' row, but this is not what I want. I only want to log changes made to a single field called 'Charges', when that field is changed I want to log it, can anyone tell me how to modify my code to do this, thanks
Create Trigger dbo.myTrigger
ON dbo.[myTable]
FOR UPDATE
AS
Declare @now DATETIME
Set @now = getdate()
BEGIN TRY
Insert INTO dbo.myAuditTable
(RowImage,Charges,ChangeDate,ChangeUser)
SELECT 'BEFORE',Charges,@now, suser_sname()
FROM DELETED
Insert INTO dbo.myAuditTable
(RowImage,Charges,ChangeDate,ChangeUser)
SELECT 'AFTER',Charges,@now, suser_sname()
FROM INSERTED
END TRY
BEGIN CATCH
ROLLBACK TRANSACTION
END CATCH
I have a table that looks like this:
[Timestamp] [P]
2008-04-06 17:30:00 119
2008-04-06 17:30:03 120
2008-04-06 17:30:07 119
2008-04-06 17:30:11 118
2008-04-06 17:30:12 129
2008-04-06 17:30:13 125
What I'm after is to create a new [dtP] column where the [dtP] is the [P] value at least 5 seconds later. I would assume I should use the dateadd() function but I've tried [Timestamp] = dateadd(ss,5,[Timestamp]) in my WHERE clause and to no avail. Any suggestions on the best way to proceed?
Desired Result:
[Timestamp] [P] [dtP]
2008-04-06 17:30:00 119 120
2008-04-06 17:30:03 120 121
2008-04-06 17:30:07 121 122
2008-04-06 17:30:11 122 125
2008-04-06 17:30:12 128 125
2008-04-06 17:30:13 129 etc...
2008-04-06 17:30:14 125
Hi. I am trying to figure out the code for sorting a manual (non-identity) number column in my table. the purpose is to
show the user's pictures in perfect order (1,2,3,4,5,6...).
The Jist of my problem... When a user first inserts six pictures, he gets:
|1|
|2|
|3|
|4|
|5|
|6|
All is good. But, say he deletes picture |3|. Now the list order looks like this:
|1|
|2|
<- |3| is removed
|4|
|5|
|6|
And, then he inserts two more pictures, now he his this:
|1|
|2|
|4|
|5|
|6|
|7| <- |7| & |8| are added
|8|
What i want to acheive is a "reshuffling" of the number order every time a picture is removed. So, when |3| is removed, |4| becomes |3|, |5| becomes |4| and so on. There should never be a gap in the order.
I am new to stored procedures, and have been trying to figure this out. Below is my guesswork:
Code:
ALTER PROCEDURE dbo.sp_NewPersonalPic
(
@photo_name VARCHAR(50) = NULL,
@photo_location VARCHAR(100) = NULL,
@photo_size VARCHAR(50) = NULL,
@user_name VARCHAR(50) = NULL,
@photo_caption VARCHAR(150) = NULL,
@photo_default BIT = NULL,
@photo_private BIT = NULL,
@photo_number INTEGER = NULL,
@photo_date DATETIME = NULL
)
AS
BEGIN
SELECT @photo_date = CONVERT(DATETIME,convert(char(26), getdate(), 109))
END
BEGIN
SET @photo_number = 1
SELECT
@photo_number = (
SELECT COUNT(*)
FROM dbo.PersonalPhotos b
WHERE
a.photo_date < b.photo_date
)
FROM
dbo.PersonalPhotos a
ORDER BY
a.photo_date
END
BEGIN
My thinking is that it would be a safe bet to use the "photo_date" column as a litmus for my "photo_number" column (ie, the most recent record inserted by the user will always be at a later date than the previously inserted record). So:
photo_number photo_date
|1| 2006-06-26 21:43:36.653
|2| 2006-06-26 21:43:50.000
|3| 2006-06-26 21:45:25.217
|4| 2006-06-26 21:45:33.763
|5| 2006-06-26 22:39:42.670
|6| 2006-06-26 22:39:49.200
If |3| is removed above, the numbers are reordered based on the time of entry sequence.
Any suggestions on how to acheive this in my stored procedure? Currenly, i get the correct order, but it goes crazy when i delete and add.
Thanks and sorry for the verbose post.
I am looking for a way to create a temp column who's value would take the value of another column and prepend a value like this to it "domain". This is the Select statement I currently have:
SELECT Nalphakey,[Last Name],[First Name],[User Name],[E-mail Address],[User Name]
FROM SkywardUserProfiles
I understand how to create an Alias for an existing column, but not sure how to do what I am wanting. I also understand that the following will do the concatenation that I need, but I have only used it in an UPDATE query, and I'm not sure how to use it within a Select statement or if that's even possible:
domainName=CONCAT('domain',User Name);