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use ALTER TABLE on a Table Variable

Posted on 2003-11-07
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Last Modified: 2012-05-04
Hey folks,

Im stumped.  I have a table variable that I need to alter dynamically:

DELCARE @tDate smalldatetime
DECLARE @BeginDate smalldatetime
DECLARE @EndDate smalldatetime

SET @BeginDate = '1/1/03'
SET @EndDate = '12/31/03'
SET @tDate = @Begindate

DECLARE @Scores TABLE (StudentName varchar(100))

WHILE (@tDate < @EndDate)  BEGIN
  SET @tVar = dbo.MonthName(Month(@tDate),1) + ' ' +  convert(varchar,year(@tDate))
  ALTER TABLE @Scores ADD @tVar VARCHAR(20) NULL
  SET @tDate = DATEADD(month,1,@tDate)
END

If the answer is you cant use ALTER TABLE for Table Variables, then how can I change my table variable after its been declared

I also tried DECLARE @Scores TABLE (@fieldNames) and that didn't work at all.

HELP!!
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Question by:DialM4Monkey
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4 Comments
 
LVL 15

Accepted Solution

by:
namasi_navaretnam earned 250 total points
ID: 9703225
If you need to dynamicaly add column you will need to use traditional temp tables.

drop table #test

create table #test
(
col1 int
)

alter table #test
add col2 int

select * from #test
0
 
LVL 22

Expert Comment

by:CJ_S
ID: 9704079
Just like you cannot place constraints on a table variable.

create table x(id smalldatetime constraint t_id default getdate())
and
declare @t table (id smalldatetime constraint t_id default getdate())


Use temporary tables instead like namasi pointed out. Just don't forget to remove them once you're finished.
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