Function Used Twice In Select Statement
May 22, 2008
Hi,
I've got a complex UDF I need to call twice in a select statement, as shown below:
SELECT
dbo.myFunction(colName),
dbo.myFunction(colName) * 2
FROM
tableName
The problem is, the result of "dbo.myFunction(colName)" is not being cached, so the function is executed again for "dbo.myFunction(colName) * 2". This is having a significant impact on performance (doubling the amount of time it takes for the query to execute).
Is there any way I can write the query so that dbo.myFunction is only executed once?
Thanks for your help,
Andrew
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Jan 21, 2004
CREATE FUNCTION GetPerson (@SSN integer, @NamePrefix varchar(10), @FirstName varchar(30), @MiddleName varchar(30), @LastName varchar(40), @NameSuffix varchar(10), @HomeID integer, @MailID integer, @DOB timestamp, @Gender varchar(1), @MaritalStatus varchar(1))
RETURNS integer as
BEGIN
DECLARE @PersonID integer
set @PersonID=0
if @SSN>0 and @SSN<999999999
Begin
select Min(lngPersonID) AS PersonID from Persons where lngSSN=@SSN
End
ELSE
if @SSN is not null
BEGIN
IF @LastName is not null and @FirstName is not null and @MiddleName is not null and @NamePrefix is not null and @NameSuffix is not null
Begin
select MIN(lngPersonID) AS PersonID from Persons
where strNamePrefix= @NamePrefix and strFirstName=@FirstName
and strMiddleName=@MiddleName and strLastName=@LastName
and strNameSuffix=@NameSuffix and lngSSN=@SSN
End
ELSE
if @LastName is not null
BEGIN
select MIN(lngPersonID) as PersonID from Persons
where strLastName=@LastName
and lngSSN = @SSN
END
END
return (@personID)
END
I m having problem with the "Select" function
the error I m getting is
Select statements included within a function cannot return data to a client (error 444)
Cann I use "select" statement in the function? If not what is the alternative?
I reduced the size of the sproc because it is a big one, I donn have any proble with syntax.
Thanks
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Aug 23, 1999
Can I write a function inside a Select statement in sql server 7.0
If so HOW ?
Manish Mehta
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Feb 3, 2015
I'm trying to use the DateDiff function within my select statement, but I'd like to add the parameter of greater than 30 days. This will have the query only return records where my bill stop date is greater than 30 days from the completion date. I currently have the datediff function within my select statement as
DATEDIFF (d,A.StopBillDate, a.CompletionDate) as [DIFFERENCE]
I would prefer to keep the datediff function within the select statement so as to have difference in days appear as a column within my output.I have been unable to add the parameter of > 30 days to the query without getting an error.
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Oct 19, 2004
Ok, for a bunch of cleanup that i am doing with one of my Portal Modules, i need to do some pretty wikid conversions from multi-view/stored procedure calls and put them in less spid calls.
currently, we have a web graph that is hitting the sql server some 60+ times with data queries, and lets just say, thats not good. so far i have every bit of data that i need in a pretty complex sql call, now there is only one thing left to do.
Problem:
i need to call an aggregate count on the results of another aggregate function (sum) with a group by.
*ex: select count(select sum(Sales) from ActSales Group by SalesDate) from ActSales
This is seriously hurting me, because from everything i have tried, i keep getting an error at the second select in that statement. is there anotherway without using views or stored procedures to do this? i want to imbed this into my mega sql statement so i am only hitting the server up with one spid.
thanks,
Tom Anderson
Software Engineer
Custom Business Solutions
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Jul 9, 2014
I am selecting the count of the students in a class by suing select COUNT(studentid) as StCount FROM dbo.student But I need to use a case statement on this like if count is less than 10 I need to return 'Small class' if the count is between 10 to 50 then I need to return 'Medium class' and if the count is more than 50 then 'Big class'.
Right now I am achieving this by the following case statement
SELECT 'ClassSize' = CASE WHEN Stcount<10 THEN 'Small Class'
WHEN Stcount>=10 and StCount<=50THEN 'Medium Class'
WHEN Stcount>50 THEN 'Big Class'
END
FROM(
select COUNT(studentid) as Stcount FROM dbo.student) Stdtbl
But can I do this with just one select statement?
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Nov 3, 2015
The select statement:
SELECT DATEDIFF(n , LAG(CAST(Date AS DATETIME) + CAST(Time AS DATETIME), 1) OVER ( ORDER BY Date, Time ),
CAST(Date AS DATETIME) + CAST(Time AS DATETIME))
FROM [DataGapTest]
Gives the right output:
NULL
1
1
3548
0
However, when I put the statement in a function, I get only zeros as the output. It's as if the lag and current value are always the same (but they are not of course).
CREATE FUNCTION dbo.GetTimeInterval(@DATE date, @TIME time)
RETURNS INT
AS
BEGIN
DECLARE @timeInterval INT
SELECT @timeInterval = DATEDIFF(n , LAG(CAST(@Date AS DATETIME) + CAST(@Time AS DATETIME), 1) OVER ( ORDER BY Date, Time ),
CAST(@Date AS DATETIME) + CAST(@Time AS DATETIME))
FROM dbo.[DataGapTest]
RETURN @timeInterval
END
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May 26, 2015
I tend to learn from example and am used to powershell. If for instance in powershell I wanted to get-something and store it in a variable I could, then use it again in the same code. In this example of a table order items where there are order_num, quantity and item_prices how could I declare ordertotal as a variable then instead of repeating it again at "having sum", instead use the variable in its place?
Any example of such a use of a variable that still lets me select the order_num, ordertotal and group them etc? I hope to simply replace in the "having section" the agg function with "ordertotal" which bombs out.
select order_num, sum(quantity*item_price) as ordertotal
from orderitems
group by order_num
having sum(quantity*item_price) >=50
order by ordertotal;
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Sep 3, 2007
Hello... im having a problem with my query optimization....
I have a query that looks like this:
SELECT * FROM table1
WHERE location_id IN (SELECT location_id from location_table WHERE account_id = 998)
it produces my desired data but it takes 3 minutes to run the query... is there any way to make this faster?... thank you so much...
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Aug 29, 2006
I am currently having this problem with gridview and detailview. When I drag either onto the page and set my select statement to pick from one table and then update that data through the gridview (lets say), the update works perfectly. My problem is that the table I am pulling data from is mainly foreign keys. So in order to hide the number values of the foreign keys, I select the string value columns from the tables that contain the primary keys. I then use INNER JOIN in my SELECT so that I only get the data that pertains to the user I am looking to list and edit. I run the "test query" and everything I need shows up as I want it. I then go back to the gridview and change the fields which are foreign keys to templates. When I edit the templates I bind the field that contains the string value of the given foreign key to the template. This works great, because now the user will see string representation instead of the ID numbers that coinside with the string value. So I run my webpage and everything show up as I want it to, all the data is correct and I get no errors. I then click edit (as I have checked the "enable editing" box) and the gridview changes to edit mode. I make my changes and then select "update." When the page refreshes, and the gridview returns, the data is not updated and the original data is shown. I am sorry for so much typing, but I want to be as clear as possible with what I am doing. The only thing I can see being the issue is that when I setup my SELECT and FROM to contain fields from multiple tables, the UPDATE then does not work. When I remove all of my JOIN's and go back to foreign keys and one table the update works again. Below is what I have for my SQL statements:------------------------------------------------------------------------------------------------------------------------------------- SELECT:SELECT People.FirstName, People.LastName, People.FullName, People.PropertyID, People.InviteTypeID, People.RSVP, People.Wheelchair, Property.[House/Day Hab], InviteType.InviteTypeName FROM (InviteType INNER JOIN (Property INNER JOIN People ON Property.PropertyID = People.PropertyID) ON InviteType.InviteTypeID = People.InviteTypeID) WHERE (People.PersonID = ?)UPDATE:UPDATE [People] SET [FirstName] = ?, [LastName] = ?, [FullName] = ?, [PropertyID] = ?, [InviteTypeID] = ?, [RSVP] = ?, [Wheelchair] = ? WHERE [PersonID] = ? ---------------------------------------------------------------------------------------------------------------------------------------The only fields I want to update are in [People]. My WHERE is based on a control that I use to select a person from a drop down list. If I run the test query for the update while setting up my data source the query will update the record in the database. It is when I try to make the update from the gridview that the data is not changed. If anything is not clear please let me know and I will clarify as much as I can. This is my first project using ASP and working with databases so I am completely learning as I go. I took some database courses in college but I have never interacted with them with a web based front end. Any help will be greatly appreciated.Thank you in advance for any time, help, and/or advice you can give.Brian
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Jan 9, 2015
Ok I have a query "SELECT ColumnNames FROM tbl1" let's say the values returned are "age,sex,race".
Now I want to be able to create an "update" statement like "UPATE tbl2 SET Col2 = age + sex + race" dynamically and execute this UPDATE statement. So, if the next select statement returns "age, sex, race, gender" then the script should create "UPDATE tbl2 SET Col2 = age + sex + race + gender" and execute it.
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Jul 20, 2005
hiI need to write a stored procedure that takes input parameters,andaccording to these parameters the retrieved fields in a selectstatement are chosen.what i need to know is how to make the fields of the select statementconditional,taking in consideration that it is more than one fieldaddedfor exampleSQLStmt="select"if param1 thenSQLStmt=SQLStmt+ field1end ifif param2 thenSQLStmt=SQLStmt+ field2end if
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Oct 29, 2007
Hi guys,
I have the query below (running okay):
Code Block
SELECT DISTINCT Field01 AS 'Field01', Field02 AS 'Field02'
FROM myTables
WHERE Conditions are true
ORDER BY Field01
The results are just as I need:
Field01 Field02
------------- ----------------------
192473 8461760
192474 22810
Because other reasons. I need to modify that query to:
Code Block
SELECT DISTINCT Field01 AS 'Field01', Field02 AS 'Field02'
INTO AuxiliaryTable
FROM myTables
WHERE Conditions are true
ORDER BY Field01
SELECT DISTINCT [Field02] FROM AuxTable
The the results are:
Field02
----------------------
22810
8461760
And what I need is (without showing any other field):
Field02
----------------------
8461760
22810
Is there any good suggestion?
Thanks in advance for any help,
Aldo.
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Jul 4, 2006
Hello friends,
I want to use select statement in a CASE inside procedure.
can I do it? of yes then how can i do it ?
following part of the procedure clears my requirement.
SELECT E.EmployeeID,
CASE E.EmployeeType
WHEN 1 THEN
select * from Tbl1
WHEN 2 THEN
select * from Tbl2
WHEN 3 THEN
select * from Tbl3
END
FROM EMPLOYEE E
can any one help me in this?
please give me a sample query.
Thanks and Regards,
Kiran Suthar
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May 5, 2015
I am attempting to run update statements within a SELECT CASE statement.
Select case x.field
WHEN 'XXX' THEN
UPDATE TABLE1
SET TABLE1.FIELD2 = 1
ELSE
UPDATE TABLE2
SET TABLE2.FIELD1 = 2
END
FROM OuterTable x
I get incorrect syntax near the keyword 'update'.
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Sep 6, 2007
I am using RS 2000. I have a multi select parameter where I can select multiple states by separating with a comma. I am trying to figure out how to incorporate an "All" parameter.
Query:
Select [name], city, state, zipcode
From Golf inner join charlist_to_table(@State,Default)f on State = f.str
Function:
CREATE FUNCTION charlist_to_table
(@list ntext,
@delimiter nchar(1) = N',')
RETURNS @tbl Table (listpos int IDENTITY(1, 1) NOT NULL,
str varchar(4000),
nstr nvarchar(2000)) AS
BEGIN
DECLARE @pos int,
@textpos int,
@chunklen smallint,
@tmpstr nvarchar(4000),
@leftover nvarchar(4000),
@tmpval nvarchar(4000)
SET @textpos = 1
SET @leftover = ''
WHILE @textpos <= datalength(@list) / 2
BEGIN
SET @chunklen = 4000 - datalength(@leftover) / 2
SET @tmpstr = @leftover + substring(@list, @textpos, @chunklen)
SET @textpos = @textpos + @chunklen
SET @pos = charindex(@delimiter, @tmpstr)
WHILE @pos > 0
BEGIN
SET @tmpval = ltrim(rtrim(left(@tmpstr, @pos - 1)))
INSERT @tbl (str, nstr) VALUES(@tmpval, @tmpval)
SET @tmpstr = substring(@tmpstr, @pos + 1, len(@tmpstr))
SET @pos = charindex(@delimiter, @tmpstr)
END
SET @leftover = @tmpstr
END
INSERT @tbl(str, nstr) VALUES (ltrim(rtrim(@leftover)),
ltrim(rtrim(@leftover)))
RETURN
END
GO
Anyone have any ideas?
Thanks,
Deb
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Oct 20, 2014
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INSERT INTO EMImportListing ("
sql += " CustId,Title,Description,JobCity,JobState,JobPostalCode,JobCountry,URL,Requirements, "
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[code]....
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Jul 11, 2007
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May 15, 2008
Hi,
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Oct 11, 2004
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Mar 24, 2005
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Feb 19, 2003
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May 6, 2008
Hello,
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Jul 19, 2006
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returns int
as
Begin
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return 0
end
GO
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Invalid use of side-effecting or time-dependent operator in 'DELETE' within a function.
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Oct 15, 2007
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Feb 25, 2008
Hi,
I have a Query some thing like this,
Select Table1.Code, 'field2' = CASE
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WHEN 2 THEN (Select name From Table3 where Table3.Code=Table1.Code)
WHEN 3 THEN (Select name From Table4 where Table4.Code=Table1.Code)
END
FROM Table1
Do I need to use Function instead of CASE for better performance ?
Regards
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Apr 26, 2005
Dear Friends.
I m trying to use the insert statement with in the function !
and i m getting this errror !
Server: Msg 443, Level 16, State 2, Procedure GetTotalCOst, Line 16
Invalid use of 'INSERT' within a function.
Please help me how to rectify it and how i can use the Insert statement with in the function !
Here is the code for the function.
create function dbo.GetTotalCOst(@varWork_no as numeric,@varSubWork_no as numeric)returns numeric as
begin
Declare @valCost integer
Declare @TotService integer
Declare @TotParts integer
Declare @TotLabour integer
Declare @TotTravel integer
Declare @TotSubContract integer
select @TotService= isnull(sum(quantity*costprice),0) From SB_Service_Suppply_Details where work_no=@varWork_no and subwork_no=@varSubWork_no
select @TotParts= isnull(sum(quantity*costprice),0) From SB_PARTS_dETAILS where work_no=@varWork_no and subwork_no=@varSubWork_no
insert into dbo.SB_InvoiceCostingService values(@TotService,@TotParts,1,1,1,1,1,1)
return (@valCost)
end
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Aug 22, 2007
hi,
I am using a function in sql server 2005 like this:
...... myfunction(... @FlagOn int)
.......
begin
return
(
if(@FlagOn = 1)
select * from.......
else
select * form....
)
end
But it keeps complaining there is some syntax error around if. What is it?
Thanks.
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