How To Select Max Value Among A Number Of Fields For Every Row?
Jan 2, 2004
Hi,
I have a fairly basic query I want to make but I'm struggling on figuring out how to do it. Let's say I have some fields (e.g. Value1, Value2, Value3, etc). I simply want to do a Select statement that returns the highest value among those fields for every row in my db.
At first I thought of the built in Max function until I realized that is for within a column only.
declare @NumberToCompareTo int set @NumberToCompareTo = 8 declare @table table ( number int ) insert into @table select 4
[Code] ....
The query selects 4 and 5 of course. Now what I'm looking for is to retrieve the number less or equal to @NumberToCompareTo, I mean the most immediate less number than the parameter. So in this case 5
I would like to store all information on them in this table but that amounts to quite a lot of fields (about 50) and some of these will store a lot of HTML text in them.
Is it best to split the table up for performance reasons or will it make little difference?
i'm wondering if there's a possibility for me to insert values into a table without knowing fix number of fields? in other words, i won't know how many fields i have in a single table until users enter data.
any suggestions or recommendations are welcome. thanks in advance.
I am working on a project which requires having a form that must be filled by the user. The number of the fields on this form is arround 150. Is it a good idea to have a database table with 150 fields (columns)? If its not what would be a better approach for this case? Handling this many fields on a windows form is another issue but first I would like to know about how to deal with the data storage.
I've found out how to to the Insert into my table (col1, col2) Select (col1, col2...) from othertable where regId= @regId in my earlier question but do i have to name every column as i have about 80 in my table. Can't I use an asterisk or something....
What I need to do is re-populate a unique number into multiple fields,
Let me explain, An employee can appear in the first table only once but can be in the second table multiple times with multiple employee numbers .There is a field called TFN that is unique and we are using it to create a unique id called KRid so what I have done is created 2 tables namely TEST_TBL and TEST2_TBL . In TEST_TBL I am populating a KRid with a unique no being produced by the TFN field only once i.e 12345 being the resulting unique id number. If an employee has 2 employee numbers i.e empno 1 and empno 1000,only employee no 1 will have the unique KRid created but nothing for 1000 because the record already exists , so what has me stumped is that the TFN for employee empno 1 and the TFN for empno 1000 are the same. How do I get the KRid (12345 from empno 1) to populate empno 1000 in TEST2_TBL , The second table has all records in so I can group the second table by TFN id but how do I populate employee 1000 in the second table with the KRid 12345.
Please help!!!!! Below are how the tables are set up and an example of the result.
TABLE 1
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[TEST_TBL]') and OBJECTPROPERTY(id, N'IsUserTable') = 1) drop table [dbo].[TEST_TBL] GO
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[TEST2_TBL]') and OBJECTPROPERTY(id, N'IsUserTable') = 1) drop table [dbo].[TEST2_TBL] GO
SELECT NPE000.EmpNumber, NPET00.RecordStatus, NPE000.KR_ID, NPE000.Surname, NPE000.FirstName, NPE000.SecondName, NPE000.Class, NPE000.DateEmployed, NPE000.DateOfBirth, NPE000.HoursPerDay, NPE000.HoursPerWeek, NPE000.PassportNo, NPE000.AwardCode, NPE000.EmailPayslipTo, NPE000.Location, NPE000.Grade, NPE000.DateTerminated, NPE000.EmploymentType, NPE000.DistCode, NPE000.EmpStatus, NPET00.TaxRefNo FROM NPE000 NPE000, NPET00 NPET00 WHERE NPET00.RecordStatus = 0 and NPET00.TaxRefNo <> ' 111111111' and NPET00.TaxRefNo <> ' 000000000' AND LENGTH(NPET00.TaxRefNo) >= 9 AND LENGTH(NPE000.KR_ID) >= 0 AND NPE000.EmpNumber = NPET00.EmpNumber
Query goes as follows for table 2:
SELECT NPE000.EmpNumber, NPE000.FirstName, NPE000.Surname, NPE000.Class, NPE000.Location, NPE000.EmploymentType, NPE000.EmpStatus, NPET00.TaxRefNo, NPE000.Paypoint, NPE000.KR_ID, FROM NPE000, NPET00 WHERE Recordstatus = 0 and (EmploymentType = 1 AND EmpStatus = 1 AND NPE000.EmpNumber = NPET00.EmpNumber
From this you can see that in table 1 it will only create 1 KR_ID for only one employee number but in table 2 I am bringing through all employee records. In table 2 I can group by NPET00.TaxRefNo which will bring all NPET00.TaxRefNo's togeather. From that I would like to populate the other employee numbers with the unique KR_ID.
I am able to import a CSV file into a temporary table as long as I know the number of fields in the CSV file. Here is what I would like to do:
I would like to have a CSV file which has UP to 6 entries per row. I would like to insert each row into a table; if the there three fields, then I want to insert them into the first three columns to the temporary table. If there are four, then insert into the first four fields. Is this possible?
I'm writing a query that will be used in Jasper Ireports, but prefer to have the values done ahead of time using SQL rather than relying on the report to do the lifting.The fields are pretty straight forward, only the display is where I have a question.
Fields Used: PERIOD ('MON-yyyy') and VALUE
The results must start with the CURRENT PERIOD (AUG-2014) in one column and the VALUE for the current period multiplied by 1/12 (VALUE*(1/12)).The next column should return the VALUE for CURRENT PERIOD - 1 (JUL-2014) and multiply by 2/12 (VALUE*(2/12))
This should continue for the last 11 months and would end with OCT-2013 with the value being multiplied (VALUE*(11/12)).Is the easiest solution to this a CASE statement looking at PERIOD then PERIOD minus one month, minus two months...etc?
I need to associate aggregate gross_revenue with calendar year, but do not have a date field that reflects payment dates, just contract periods a start_date and an end_date. The contract periods are typically 1 or 2 years and can start at any time I.e start_date 6/1/2012, end date 5/31/13. I think by finding the number of days that fall in each calendar year and storing in a temp table, I can create a simple formula to associate revenue to each year.
Hello I have some flat files that contain CSV records with different number of fields but the first 4 fields of each record type are the same of each re. eg there would be an entry of one record that has eight fields and another that has 6 fields. Which of the items in the toolbox can i use to filter the records based on the entry in the first 4 fields so i can process the filtered records.
The select command below will output one patient’s information in 1 row:
Patient id Last name First name Address 1 OP Coverage Plan 1 OP Policy # 1 OP Coverage Plan 2
[code]...
This works great if there is at least one OP coverage. There are 3 tables in which to get information which are the patient table, the coverage table, and the coverage history table. The coverage table links to the patient table via pat_id and it tells me the patient's coverage plan and in which priority to bill. The coverage history table links to the patient and coverage table via patient id and coverage plan and it gives me the effective date.
select src.pat_id, lname, fname, addr1, max(case when rn = 1 then src.coverage_plan_ end) as OP_Coverage1, max(case when rn = 1 then src.policy_id end) as OP_Policy1,
For example in a table with this fields "field1, L1,L3,L100" field2 the count is 3
it would be better to match a number into the like but i thinks it cannot be done in the like so i've to add another condition to ensure all the text after L is a number.
is this the best way to do it?
Select count(*) from Information_Schema.Columns Where Table_Name = @Table AND column_name like 'L%' and ISNUMERIC(SUBSTRING(column_name,2, len(column_name)-1))=1
what is the best way to uses ssis to deal with a CSV file that contains a number of records that contain a different number of fields ?
I could just load as a single column delimited by <CRLF> but then I would have to write the code to parse the line, effectively detokenising the columns myself but if that is the case then why uses ssis at all ?
Im trying to determine the best way to store data gathered from a form that a user will fill out online. The form is dynamic and is customized at run time based on group-specific criteria. The end result is a form that might have 3 extra text boxes, 2 extra sets of radio buttons and a freeform textbox, whereas for another group, there might be a slightly different set of input fields. Now comes the issue of storing this data. Since the fields can be somewhat dynamic, it could get tricky to define table columns for each possible input field. So Im considering storing the data as xml. Has anyone else had to build custom forms and ended up storing the data as xml ?
The thing about the region is that it can be defined by states only, in which case CountyID and CityId are NULL, can be defined by Counties too, in which case only CityID is NULL or it can be defined up to City level, in which case all 3 are set to something. Example, Northeast would be all cities from northeast, but Pocono would be just some counties in PA, and so on...
The issue is now selecting all cities that belong into a region... Normally I would join the Zips table with the Region_Data table and retrieve all CityIDs... The issue is that, as I said, the CountyID and CityID might be null for some records, so I am not sure how to retrieve them?
I came up with one idea in which I create 3 temporary tables and I select in them all the records that have 1) only state, 2) only state and county, 3) all 3, then I join each and I union the results...
But I am wondering if there is a way to do the select in one shot?
I have a really large table with many Proposal fields and corresponding approval fields.
Propose1 Approve1 Propose2 Approve2
Would it be good practice or even possible for me to select all proposal fields using a wildcard somehow within the select statement. If it is ok, how would I go about doing it?
I have: Dim queryString As String = "SELECT distinct [CSULOG5].[status] + [CSULOG5].[lmca_nbr] FROM [CSULOG5]" I even tried & instead of +. but it doesn't like it. Is it legit syntax for mssqlserver? This is a vb project aspnet
Could anyone tell me what governs whether a column is set as nullable or not nullable when creating a table using SELECT...INTO. It just seems to pick at random for me! I'm quite sure this is not the case. Is there a way to force a column to be non- nullable? I seem to be wasting a lot of time going through and altering the schema so I can use the columns in keys and indexes.
The data I have has a 1 in for each Yes answer and a 2 for each no answer. I just want the select statement to show the word yes when there's a 1 and the word no when there's a 2. I don't need to update or change the database. Could anyone lead me in the right direction here? Thanks
In order to ask my question on a SQL query I will use a simplified version of a table I was struggling with...
¦¦¦¦SHOP¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦CARS
KILBURN MOTORS¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦Mercedes KILBURN MOTORS¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦BMW KILBURN MOTORS¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦FIAT BRIXTON AUTOMOBILE¦¦¦¦¦¦¦¦¦¦¦¦¦¦Mercedes BRIXTON AUTOMOBILE¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦BMW WEST HAMPSTEAD CARS¦¦¦¦¦¦¦¦¦¦¦¦¦Mercedes CAMDEM MOTORS¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦FIAT NORTHERN LONDON CAR-STORE¦¦¦¦¦¦¦¦¦¦¦BMW NORTHERN LONDON CAR-STORE¦¦¦¦¦¦¦¦¦¦¦FIAT
So my question is: how can I select only SHOPs which have no CARS variety (e.g. a variety =1)?
In other words I am looking for a Query that would give me this outcome:
¦¦¦¦SHOP¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦CARS
WEST HAMPSTEAD CARS¦¦¦¦¦¦¦¦¦¦¦¦¦Mercedes CAMDEM MOTORS¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦FIAT
...because WEST HAMPSTEAD CARS, selling Mercedes only, has a CARS variety equal to 1 as well as Camdem Motors which sells only FIAT.
I tried with this query:
SELECT DISTINCT SHOP, CARS FROM CAR_SELLERS GROUP BY SHOP, CARS HAVING COUNT(CARS) = 1
But it doesn't work.
In addition I also would like to know for example how to create a similar query for a different desired CARS variety (e.g. 2, 3...)
How to do the tabs or attach images in the Post New Topic Message box... I wanted to attach a screen shot of the table but I was not able to and so, in order to post my question, I prepared a simplified version of the table plus I had to do the tabs/spaces manually with the symbol (¦)
Hi,Is there a way to exclude fields in a query other than just includingthe ones you want. If there are 20 fields and you want to see all but3, it would be a lot easier to exclude the 3.Thanks
I thought this was working, but apparently it was not. I was wondering how I would create a SELECT Statement for values that are blank (Equal to ""). I really could have swore that this was working, but I guess it wasn't.
// create an open the connection OleDbConnection conn = new OleDbConnection(conString); OleDbCommand command = new OleDbCommand(); command = conn.CreateCommand();
// create the DataSet DataSet ds = new DataSet();
// run the query command.CommandText = "SELECT ID AS [#], Company AS [Company], FName AS [First Name], LName AS [Last Name], Type AS [Type] FROM Table1 WHERE Tags = @P0;"; OleDbDataAdapter adapter = new OleDbDataAdapter(); adapter = new OleDbDataAdapter(command); command.Parameters.Add("@P0", OleDbType.VarChar).Value = ""; adapter.Fill(ds);
// close the connection conn.Close();
bindingSource1.DataSource = ds.Tables[0];
DataGridView.DataSource = bindingSource1;
// set the size of the dataGridView Columns this.DataGridView.Columns[0].Visible = false; this.DataGridView.Columns[1].Width = 234; this.DataGridView.Columns[2].Width = 50; this.DataGridView.Columns[3].Width = 50; this.DataGridView.Columns[4].Width = 75;
//Sort on the Title Column DataGridViewColumn sortColumn = DataGridView.Columns[1]; ListSortDirection direction; direction = ListSortDirection.Ascending; DataGridView.Sort(sortColumn, direction);
//Set the Selected Property of the First Row to False DataGridView.Rows[0].Selected = false; } catch { }
I have a table with two sets of fields, one for PRIMARY Mail Address and the other for ALTERNATE Mail Address. Both sets are five fields long. I will call them PRIMARY & ALTERNATE for this discussion. I want to select the PRIMARY fields if ALTERNATE is either null or zero, and the ALTERNATE fields if data is present.
I have used this syntax but it gives a table with both the PRIMARY & SECONDARY records.
SELECT TXPRCL, TXALTR, TXANAM FROM dbo.PCWEBF21 WHERE (TXALTR > 0) UNION SELECT TXPRCL, TXTAXP, TXTNAM FROM dbo.PCWEBF21 WHERE TXALTR = 0
Would a Select Case work? something like
Select PRIMARY when ALTERNATE = 0, and ALTERNATE when ALTERNATE > 0 or is not null.
Hi, how do i do a select statement with asp.net to return a record if a field is null. I have the following code: SqlCommand cmd = new SqlCommand("SELECT * FROM Categories WHERE ParentId = @ParentId", cn);.Parameters.Add("@ParentId", SqlDbType.Int).Value = parentId != null ? (object) parentId : DBNull.Value;cn.Open(); The variable parentId is a nullable int. However when i pass in a null value it doesn't return anything even though there are records in the database that have a null value for the ParentId field. Appreciate if someone could tell me what i am doing wrong. Thanks
Is it possible to combine fields and text in a select statement? In a dropDownList I want to show a combination of two different fields, and have the value of the selected item come from a third field. So, I thought I could maybe do something like this: SELECT DISTINCT GRP AS GroupName, "Year: " + YEAR + "Grade: " + GRD AS ShowMe FROM GE_Data WHERE (DIST = @DIST)
I hoped that would take the values in YEAR and GRD and concatenate them with the other text. Then my dropDownList could show the ShowMe value and have the GroupName as the value it passes on. However, when I test this in the VS Query Builder, it says that Year and Grade are unknown column names and changes the double-quotes to square brackets. If this is possible, or there's a better way to do it, I'd love some more info. Thanks! -Mathminded
I m writing a stored procedure to query a table Population that has the following fields - CityId, CityName, Plus0, Plus10, Plus20, Plus30, Plus40, Plus50, Plus60, Plus70, Plus80. The field Plus0 contains the number of people of age > 0 living in the city, Plus10 contains the number of people of age > 10 living in the city and so on. Given the city id and age groups like 20To40, 50To60, 40Plus, etc., I should be able to query the number of people in the city corresponding to the requested age group. Note that if the requested age group was 20To60, I need to make use of only 2 fields Plus20 and Plus60 in the table to compute this value. And if the requested age group was 40Plus, then I need only the value in the field Plus40. The problem is that a wide variety of age groups can be requested like 0Plus, 10Plus, ... , 80Plus, 0To10, 0To20, 0To30, .... 70To80.
Which is the most effecient way to handle this ?
1. Have a stored procedure that returns all the fields even though only 1 or 2 of them would be actually used ?
In this case, if I returned data for a large number of cities then there would be a lot of unnecessary information that was returned by the query. Lots of data would be passed through the network though most of it would not be used.
2. Have a stored procedure that takes in parameters @Plus0, @Plus10, @Plus20, .. @Plus80 that are bits indicating whether the field was required or not and then using a CASE statement to return values for a field only if the corresponding bit parameter was set, and returning NULL if the corresponding bit paramter was not set ?
In this case, I would be returning NULL for all those fields that were not required for a particular age group. This would save some network bandwidth, wouldn't it ?
3. Pass in the age group itself (ex: 0To20) as a parameter to the stored procedure and have lots of IF statements, one for each age group, that return only the fields that are needed for that age group.
This leads to a lot of code repitition.
4. Use a similar approach as above but use dynamic SQL queries to avoid code repitition.
But using dynamic SQL queries can affect the performance of the stored procedure as they need to be compiled each time.
I used this statement, select * from table1 where date1 = null, in SQL Query window and got a few records back. Now, I used the same statement in my VB 5 code and no record is found. How do I select all the records in table1 which do not have values in field date1? Thanks for the help.
