TABLE Variables
Jul 20, 2005
Hey everyone,
I read in a SQL Server book that you can now create a table
variable.
DECLARE @TMP TABLE (list of fields)
Then you can you can use the statement
INSERT INTO @TMP
SELECT (whatever).
I've tried it and it works. The book also says that you
should be able to pass these variables between stored
procedures and functions. Problem is, when I try to
declare the variable at the top of the procedure, the
syntax checker hates it.
Anyone else out there try this out?
SAM
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Apr 10, 2008
How do I use table names stored in variables in stored procedures?
Code Snippetif (select count(*) from @tablename) = 0 or (select count(*) from @tablename) = 1000000
I receive the error 'must declare table variable '@tablename''
I've looked into table variables and they are not what I would require to accomplish what is needed.
After browsing through the forums I believe I need to use dynamic sql particuarly involving sp_executesql. However, I am pretty new at sql and do not really understand how to use this and receive an output parameter from it(msdn kind of confuses me too). I am tryin got receive an integer count of the records from a certain table which can change to anything depending on what the user requires.
Code Snippet
if exists(Select * from sysobjects where name = @temptablename)
drop table @temptablename
It does not like the 'drop table @temptablename' part here. This probably wouldn't be an issue if I could get temporary tables to work, however when I use temporary tables i get invalid object '#temptable'.
Heres what the stored procedure does.
I duplicate a table that is going to be modified by using 'select into temptable'
I add the records required using 'Insert into temptable(Columns) Select(Columns)f rom TableA'
then I truncate the original table that is being modified and insert the temporary table into the original.
Heres the actual SQL query that produces the temporary table error.
Code Snippet
Select * into #temptableabcd from TableA
Insert into #temptableabcd(ColumnA, ColumnB,Field_01, Field_02)
SELECT ColumnA, ColumnB, Sum(ABC_01) as 'Field_01', Sum(ABC_02) as 'Field_02',
FROM TableB
where ColumnB = 003860
Group By ColumnA, ColumnB
TRUNCATE TABLE TableA
Insert into TableA(ColumnA, ColumnB,Field_01, Field_02)
Select ColumnA, ColumnB, Sum(Field_01) as 'Field_01', Sum('Field_02) as 'Field_02',
From #temptableabcd
Group by ColumnA, ColumnB
The above coding produces
Msg 208, Level 16, State 0, Line 1
Invalid object name '#temptableabcd'.
Why does this seem to work when I use an actual table? With an actual table the SQL runs smoothly, however that creates the table names as a variable problem from above. Is there certain limitation with temporary tables in stored procedures? How would I get the temporary table to work in this case if possible?
Thanks for the help.
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May 19, 2014
I am trying to update one table when records are inserted in another table.
I have added the following trigger to the table “ProdTr” and every time a record is added I want to update the field “Qty3” in the table “ActInf” with a value from the inserted record.
My problem appears to be that I am unable to fill the variables with values, and I cannot understand why it isn’t working, my code is:
ALTER trigger [dbo].[antall_liter] on [dbo].[ProdTr]
for insert
as
begin
declare @liter as decimal(28,6)
[Code] ....
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Feb 2, 2006
Hello,I am writing a function that uses two table variables. The structures ofboth are shown here:DECLARE @workdates TABLE (conflict CHAR(1),workdate SMALLDATETIME)DECLARE @existing TABLE (workdate SMALLDATETIME)I need to do an update on the first table:UPDATE @workdatesSET conflict = 'X'FROM @existing sWHERE workdate = s.workdateI am concerned that the unqualified 'workdate' in the WHERE clause willgive me an ambiguous column reference. Is this SQL statement valid?Thanks,Andrew
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May 9, 2007
Will reporting services allow the use of table variables in the SQL query?
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Jun 11, 2007
I want to querry a table based on the input of a form, I have tables Monday, Tuesday ect., and want to display the records for Monday if the user selects Monday in a menu. I need to delcare a table name but am not sure how?
DELCARE @myVar char(20)
SET myVar = Request.Form("select2");
"SELECT * FROM @myVar"
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Apr 28, 2008
I know user defined global table variables are not allowed in sql. I'm trying to avoid using temporty tables for speed reasons. I have a function in which a table variable is defined, and a function within that function that needs to call that table variable. Any ideas?
Thanks
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Feb 28, 2005
Is it possible to do something like this in SQL:
DECLARE @TABLE table
if @GOOD = 1 BEGIN
Set @Table = Table1
END ELSE BEGIN
Set @Table = OtherTable
END
SELECT * FROM @TABLE
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May 4, 2007
So, I've got a problem with using table variable "fields" and a simple variable in calculations. It ain't workin'. See the bolded code below. When I run the SP, it returns 0 for those values. Anyone got any clues? Is this a table variable limitation? ALTER PROCEDURE YearlyTotalsInPercentages(@Year int) ASBEGINDECLARE @TotalSum intDECLARE @Totals TABLE
(
CBDCYearlyTotals int, ProductLine varchar(50))INSERT INTO @Totals (CBDCYearlyTotals, ProductLine)SELECT SUM(dbo.Main.Hours), dbo.Project.ProductLineFROM dbo.Main INNER JOIN dbo.Department ON dbo.Main.DeptNo = dbo.Department.DeptNo INNER JOIN dbo.Project ON dbo.Main.ProjectNo = dbo.Project.ProjectNoWHERE dbo.Main.UserID LIKE 'CI%' AND dbo.Project.ControlLocation = 'IND' AND DATEPART(yyyy, dbo.Main.DataDate) = @Year AND dbo.Main.Active = 1GROUP BY dbo.Project.ProductLine SET @TotalSum = (SELECT SUM(dbo.Main.Hours)FROM dbo.Main INNER JOIN dbo.Department ON dbo.Main.DeptNo = dbo.Department.DeptNo INNER JOIN dbo.Project ON dbo.Main.ProjectNo = dbo.Project.ProjectNoWHERE dbo.Main.UserID LIKE 'CI%' AND dbo.Project.ControlLocation = 'IND' AND DATEPART(yyyy, dbo.Main.DataDate) = @Year AND dbo.Main.Active = 1) SELECT t.CBDCYearlyTotals AS CBDCYearlyTotals, t.ProductLine AS ProductLine, @TotalSum AS TotalSum, ROUND((t.CBDCYearlyTotals/@TotalSum) * 100, 1) AS Percentage FROM @Totals tEND
GO
Thanks Yall
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Jan 6, 2004
hi all!
I am using table variables instead of creating a temp table because it seems to be faster
But now I need qualify the table variable so I can join it with another table having a field with same name of a field from the table variable. U know if I can do that?
ex: with temp table
create table #tmp.... (F1...)
#tmp.f1
with table variable
declare @temp table(...
@table.f1 - can´t do it
the first question is if I can join the table variable with another table and how to do that qualifying the variable table, that is, putting the name of the var temp with the field, because the other table has a field with same name
thank to all and happiness for all 2004
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Aug 23, 2004
Hello, all. I'm attempting to insert data into a table variable using dynamic SQL created at runtime.
However, with a Table variable, SQL server will not allow the EXEC method to be used in an INSERT statement.
How do I go about this?
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May 4, 2000
I am trying to add a variable to a temporary table name. Throughout a stored procedure, I do a lot with this table. I delete, insert, update, and query this table. Is there a way to do the following without having to set the entire 'select * from ...' line as a variable? Below is what I am trying to accomplish. It all works until the select * line. Is there a way to accomplish what I am trying to do below?
Declare @table varchar(255),
@PassedID integer
set @passedID=5
set @table="test"+CONVERT(varchar(20), @passedID)
select * from @table
Thanks,
Jon
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Nov 14, 2005
I have a cursor which populates a variable with the name of each user table within my DB.
I'm trying to copy the tables one at a time by using a command like this:
SELECT * INTO @NewTable FROM @OrigTable
Query analyzer tells me that there's incorrect syntax near the keyword 'INTO'.
This seems fair enough to me as I assume it's trying to put the data into the variable rather than the table name which is held within the variable. Does any know how I can get around this?
Are there any alternative ways of copying the table structure (preferable without the data)?
BTW both variables are of type char(100)
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Aug 23, 2013
I have a table that has two columns POLICY_NUMBER and POLICY_TYPE
POLICY_NUMBER POLICY-TYPE
123 1
123 1
123 1
567 2
567 2
789 1
789 1
345 1
345 1
345 1
I need to write a script that give me the following result
policy_type_count policy_type
3 1
1 2
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Nov 6, 2014
Can we use tables variables in triggers... if yes, any example...
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Feb 16, 2006
Can an identity be created in a table variable?
Can joins be performed between table variables to be inserted into another table variable?
Am I better of using a temporary table?
(I'm working in a stored procedure here)
Thanks in advance
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Jul 20, 2005
I have a problem with executing following T-SQL select query.My select statement looks like thisSELECT * FROM (@TableName_FirstPart + @TableName_secondPart)**@TableName_FirstPart & @TableName_SecondPart are Local variables**Im getting Incorrect syntax error for this statement.Following is the error message:"Server: Msg 170, Level 15, State 1, Line 55Line 55: Incorrect syntax near '+'."Is it possible to construct table names in the FROM clause dynamically ?Thanks in advance
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Apr 18, 2005
It's come up more than once for me, where I need to DECLARE and SET several SQL variables in a Stored Procedure where many of these values come from the same table record - what is the best method for doing this, where I don't have to resort to making a separate query for each value.
Currently I'll do something like this:
DECLARE @var1 intSET @var1 = (SELECT TOP 1 field1 FROM table1 WHERE recordkey = @somekey)DECLARE @var2 nvarchar(20)SET @var2 = (SELECT TOP 1 field2 FROM table1 WHERE recordkey = @somekey)
Of course, I'd rather just have to query "table1" just once to assign my variables.
What obvious bit of T-SQL am I missing?
Thank you in advance.
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Mar 8, 2006
How do I know when to use a table variable, and when to use a temp table in my stored procedures? It seems that in most cases table variables are more efficient (in terms of execution time / CPU usage) but some of my stored procedures perform an order of magnitute better with temp tables instead.
Short of testing the stored proc both ways, how do I know what to do?
declare @Temp table
or
create table #Temp
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Mar 19, 2006
Is it possible to use variable name to dynamically define a query in a stored procedure? EX:
@Column = 'COUNT(*)'
@Category = 'Products'
@Table = 'Items. + @Category
SELECT @Column
FROM @Table
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Jun 21, 2001
This should be a relatively easy one... Are table variables, the data type, SQL (92 or 99) compliant?
TIA,
R2ro
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Oct 20, 2013
I need to move data from one table to another using variable percentages and business days.
Here is the basic idea:
Variables: varTable1, varTable2, varPercentage
Get varPercentage of rows of VarTable1 that have a date of "current business date -1" and place into varTable2.
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Jun 22, 2006
Hi, I am new to using SQL for anything more in depth than querying and reporting.
I am trying to create a series of SQL scripts which will be used across several customer sites so need to be easily customisable. What I want to do is have all of the table names, field names and customisable items handled by variables which will be declared and set at the beginning of the script, making them easy to find and change. The problem I am having at the moment is with creating a new table using variables for table name and field names, can anyone help?
quote:
DECLARE
@a_tmptbl varchar(15),
@a_fieldid1 varchar(15)
set @a_fieldid1 = 'newFieldid'
set @a_tmptbl = 'newTable'
create table @a_tmptbl ( @a_fieldid1 varchar(15), value float, counter INT);
insert into @a_tmptbl values ( "foobar", 21.76, 1);
select * from @a_tmptbl;
The error I am getting is:
quote:Server: Msg 170, Level 15, State 1, Line 8
Line 8: Incorrect syntax near '@a_tmptbl'.
Server: Msg 137, Level 15, State 1, Line 10
Must declare the variable '@a_tmptbl'.
Server: Msg 137, Level 15, State 1, Line 12
Must declare the variable '@a_tmptbl'.
Any advice would be gratefully accepted
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Jul 23, 2005
What would be the correct syntax, if any, that allows updating a tablevariable in a statement that uses the same table variable in a correlatedsubquery? Here's an example:DECLARE @t table (N1 int NOT NULL, N2 int NOT NULL)UPDATE @t SETN1 = (SELECT COUNT(1)FROM @t AS tWHERE t.N2 < @t.N2)This doesn't compile, complaining about "variable @t" in the WHERE clause.I'm not so interested in a way to rewrite this particular statement to makeit work, but rather in a general way to refer to table variables in thecontexts where correlation names cannot be used.Thank you.--remove a 9 to reply by email
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Dec 15, 2005
I am running SQL Server Best Practices on a SQL 2000database and it is recommending me to change the temptables inside SPs to table variables.I had read already in other places to use table variablesover temp tables. I also know I can't create indexes asI can on temp tables. Instead I'll have to create eithera primary key and/or a unique index on a table variable.One question I have is let's say I will be putting thousandsof records in a temp table, should i still choose a tablevariable over a temp table for this? Or is there arecommended limit where if I have to store certainnumber of records then it's better to store them ina temp table rather than a table variable? Or numberof records is not the factor to decide whether to usetemp tables or table variables?I would like to know when it's ideal or best to usetemp tables instead of table variables and vice versa.Thank you
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Mar 10, 2006
Hi,I have a user-defined function which returns a table (call it '@a'),and has another table defined as a variable (call it '@b'). When I tryto do the following query, I get "Must declare the variable '@b'" and"Must declare the variable '@a'." How do I remedy this?The query:UPDATE @aSETstuff =(SELECT otherStuff From @bWHERE @b.someID = @a.someID)
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Jul 20, 2005
HiI'm using the SQL 2000 table variable to hold 2 different fact sets.I'm declaring the variable @CurrentTable and inserting into it using aSELECT statement with no problems.I'm leaving certain of the columns null in order to later update themwith the PK.Problem is in the UPDATE syntax I'm usingUPDATE @CurrentTableSET ManagerTitle = (select mgrs.pos_title from mgrs) wheremgrs.pos_num = @CurrentTable.MgrPosNumIt is insisting I declare the @CurrentTable variable when I try to useit in the where clause.Is it simply out-of-scope or am I really doing something foolish?Andrew
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Aug 16, 2007
Hello,
I need to check if the IDs in table A on the server X exist in table B (if not check table C, if not in C, check table D ) on the server Y. The problem is that the table name changes every year and I need to use the variable for the reference table name in LookUp component in the Dataflow Task.
Can anyone help me?
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May 7, 2008
I have a function that returns a table of matching names. For the most part it returns under 5,000 results which doesn't cause too much lag joining to the search report data (which is indexed). But sometimes there might be 10,000 + search name results. I find this and higher can cause excessive lag joining. Is it possible to index this result table from the function? Or any other suggestions?
THANKS
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Nov 16, 2006
Hi,
What is the difference between CTE and table variables.
I read that CTE is used so that the tables do not get persisted in the database. Do the table variables have the same efficiency? i.e. not persisted in the database.
Can you throw some light over here if you understand the two concepts clearly please?
Thanks
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Jan 11, 2006
I am using a table variable inside a stored procedure that I am trying to execute from an OLE Datasource task in IS. I know there was a problem doing this in DTS, which would result in an Invalid Pointer error. I am not getting that error, but I am getting an error that says "[OLE DB Source [55]] Error: A rowset based on the SQL command was not returned by the OLE DB provider." The stored procedure runs fine on it's own.
Any thoughts?
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Nov 16, 2006
I have variables and values stored in a table in this format
process_id | t_variable | t_value
-----------------------------------------------------
1 | Remote_Log_Server | AUSCPSQL01
...
many such rows
how to assign values to variables in SSIS?
basically i'm looking for SQL equivalent of the following query i currently use to assign values to multiple variables (in a single query)
SELECT
@varRemoteLogServer=MAX(CASE WHEN [t_variable] = 'Remote_Log_Server' THEN [t_value] END)
,@varVariable2=MAX(CASE WHEN [t_variable] = 'variable2_name' THEN [t_value] END)
FROM Ref_Table
WHERE process_id=1
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Nov 8, 2004
i'm trying to create a stored procedure that takes 2 input parameters (taken from a querystring): a table name, and a number that needs to be checked whether it exists within that table. yes, i have different tables, one for each forum, so they will have the same structures -- i'm figuring this approach will result in faster page-load times if the tables have less in them. if everyone here tells me that having one table for all the forums will work fine, i'll just go that route, but if not, here's my procedure:
Create Procedure VerifySubjectNum
(@forum_ID VARCHAR(10), @subject_num INT)
As
If Exists
(SELECT subject_num FROM @forum_ID WHERE subject_num = @subject_num)
Return 1
Else
Return 0
when i try to create this, i get an error saying @forum_ID must be declared... why doesn't it work within the select for the EXISTS?
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