Question

I have a variable table:

DECLARE @A_Table TABLE(ID INT, att1 VARCHAR(100), att2 nvarchar(200))

I want to make dynamic sql, so I insert into this table some data (all inside a loop):

WHILE (@i <= 100) BEGIN         
  SELECT @other_att  = NAME  FROM @other_Table where ID =  @i;
  SET @sql = 'INSERT ' + @A_Table+ '(ID,att1,att2) SELECT '+CAST(@i AS VARCHAR)+' , '''+ @other_att+''', SUM('+ @other_att') FROM '+ @EVEN_OTHER_Table;
EXEC (@sql);

END 

sql every time would look like:

INSERT INTO @A_Table SELECT 1 , 'subject', SUM(subject)
INSERT INTO @A_Table SELECT 2 , 'age', SUM(age)
INSERT INTO @A_Table SELECT 3 , 'sex', SUM(sex).... 

AND after executing this :
SO I will get:

@A_Table:
id    att1   att2
1   subject   4.3
2   age       4.5
3   sex       4.1

but I get an error:

Msg 137, Level 16, State 1, Line 48
Must declare the scalar variable "@A_Table".

SO what is it the syntax to insert dynamically into a variable table?

Ok I have understood it.

Answer 1

You have a table variable, not a variable that contains the table name.

So you would need the following.

WHILE (@i <= 100) BEGIN         
  SELECT @other_att  = NAME  FROM @other_Table where ID =  @i;
  SET @sql = 'INSERT INTO @A_Table (ID,att1,att2) SELECT '+CAST(@i AS VARCHAR)+' , '''+ @other_att+''', SUM('+ @other_att') FROM @EVEN_OTHER_Table';
EXEC (@sql);

END 

You would also need to declare the table variable as a statement inside the @sql variable, and execute your declare table and inserts together, or use a local/global temporary table.

With a local temporary table (stored in the tempdb) you could do something like this.

CREATE TABLE #testtbl (ID INT);
EXEC ('INSERT INTO #testtbl VALUES (1)');
SELECT * FROM #testtbl
DROP TABLE #testtbl

Some good info about temporary tables in BOL

http://msdn.microsoft.com/en-us/library/ms174979.aspx – quite far down the page

And the table type.

http://msdn.microsoft.com/en-us/library/ms175010.aspx