Question

I want to write a t-sql stored procedure (aka sproc) which selects 3 columns from ‘MyTable’. In addition, I want to update the table in the same sproc:

1. I select the third value from the table.
2. If it equals ‘true’, I want to update the relevant record in the table to ‘false’

I wasn’t sure what syntax should I use. Could you help me out?

ALTER procedure [dbo].[My_PROC]
    @ID varchar(10)
AS
BEGIN

    declare @Col3 bit;

    set @Col3 = select Col3
    from dbo.MyTable  with (nolock)
    where @ID = ID


    if @Col3 = 'true'  
        update dbo.dbo.MyTable set col3 = 'false'
        where @ID = ID

    select Col1, 
    Col2, 
    Col3
    from dbo.MyTable table  with (nolock) where @ID = ID,
    table.Col1,
    table.Col2,
    @Col3   
END

edit: I want to return the original Col3 (not the updated value).

Answer 1

Use:

ALTER procedure [dbo].[My_PROC]
    @ID varchar(10)
AS
BEGIN

    SELECT t.col1, 
           t.col2, 
           t.col3
      FROM dbo.MyTable AS t WITH (NOLOCK)
     WHERE t.id = @ID

    -- No need for an IF statement to determine updating...
    UPDATE dbo.dbo.MyTable 
       SET col3 = 'false'
     WHERE id = @ID
       AND t.col3 = 'true'

END

I don’t know what you’re intending for the final SELECT, but I can update it once I understand what you intended.