Why is my alter table statement not properly adding a column to my temporary table?

问题

I have a temporary table created at the beginning of this stored procedure. It is created successfully and can be selected from and inserted to.

Here is the create statement

CREATE TABLE #tmpImportData (GuideFirstName VARCHAR(MAX), GuideLastName VARCHAR(MAX), 
                             email VARCHAR(MAX), group_id_text VARCHAR(MAX), CandidateName VARCHAR(MAX), 
                             grade_text VARCHAR(5), dateofbirth DATE

                             )

My problem is trying to update a column after I alter the temporary table. I get the error

Msg 207, Level 16, State 1
invalid column name

Code:

declare @SQl1 nvarchar(max)
set @SQL1 ='
ALTER TABLE #tmpImportData 
ADD group_id INT
ALTER TABLE #tmpImportData 
ADD guide_id INT
ALTER TABLE #tmpImportData 
ADD password_plain_text VARCHAR(500)
ALTER TABLE #tmpImportData 
ADD guide_email VARCHAR(500)
ALTER TABLE #tmpImportData 
ADD class_id INT'

exec sp_executesql @Sql1

UPDATE #tmpImportData 
SET group_id = CAST(group_id_text AS INT)

UPDATE #tmpImportData 
SET group_id = 0 WHERE group_id IS NULL

回答1:

try do it like this

declare @SQl1 nvarchar(max)
set @SQL1 ='
ALTER TABLE #tmpImportData 
ADD ['+@group_id+'] INT
ALTER TABLE #tmpImportData 
ADD ['+@guide_id+'] INT
ALTER TABLE #tmpImportData 
ADD ['+@password_plain_text+'] VARCHAR(500)
ALTER TABLE #tmpImportData 
ADD ['+@guide_email+'] VARCHAR(500)
ALTER TABLE #tmpImportData 
ADD ['+@class_id+]' INT'

exec  @Sql1

UPDATE #tmpImportData 
SET group_id = CAST(group_id_text AS INT)

UPDATE #tmpImportData 
SET group_id = 0 WHERE group_id IS NULL

来源：https://stackoverflow.com/questions/27339995/why-is-my-alter-table-statement-not-properly-adding-a-column-to-my-temporary-tab

标签

sql-server

tsql

sql-update

ddl

alter-table