Is there anyway to reset the identity of a Table Variable?

Question

Say I have a table variable:

DECLARE @MyTableVar TABLE (ID INT IDENTITY(1,1), SomeData NVARCHAR(300))

After I have inserted 250 rows, I nee

Answer 1

Since you are re-using your table, if I got it right, how about you do not initialize your counters to 1 and instead use this as an example?

DECLARE @ctr INT
IF @ctr IS NULL or @ctr <= 0 --this part is to control @ctr value on loops
   SET @ctr = 1
ELSE
   SELECT @ctr = MIN(id) FROM @tbl

This way, you are not restarting your loop to 1 nor is there a need for you to truncate the table.

Answer 2

I just had this idea and it works!!! :

declare @TableVariable table (
    IdentityColumn int identity(1,1),
    SomeOtherValue int,
    DesiredResult int
)
declare @FirstIdentityValueEachTimeYouLoadDataToTable int
declare @Count int
set @Count = 1

while @Count <= 5
begin
    delete @TableVariable

    insert into @TableVariable (SomeOtherValue) select 45
    insert into @TableVariable (SomeOtherValue) select 90
    insert into @TableVariable (SomeOtherValue) select 2

    select @FirstIdentityValueEachTimeYouLoadDataToTable = min(IdentityColumn) from @TableVariable

    Update @TableVariable set DesiredResult = IdentityColumn - @FirstIdentityValueEachTimeYouLoadDataToTable + 1

    select * from @TableVariable
    set @Count = @Count + 1
end 

Answer 3

You can't reseed the identity value on a Table Variable but you can do the same thing with a Temp Table:

CREATE  TABLE #TAB(ID INT IDENTITY,VALUE VARCHAR(10))
DECLARE @RESEED INT = 32
DBCC CHECKIDENT(#TAB,RESEED,@RESEED)
INSERT INTO #TAB  
SELECT 'TEST'
SELECT * FROM #TAB  

Answer 4

Is it possible to have another int column on your table variable and update that column with modulo after the insert is finished?

declare @Mytablevar table
(
id int identity(1,1)
,id1 int
somedata nvarchar(300)
)

-- insert your data as you would.  After insert is finished, do the following:

update @mytablevar set id1 = case when id > 250 then id % 250 else id end

Answer 5

If you are using SQL Server then use this DBCC CHECKIDENT('Customer', RESEED, 0) Where Customer is a table name. When you insert records into table after this command your primery key column value will be start from 1 again.

Read this http://codedotnets.blogspot.in/2012/09/how-to-reset-identity-in-sql-server.html

Answer 6

DELETE FROM does not reset identity. TRUNCATE does.