如何让SQL Server忽略检查？

I have a SQL script that populates a temp column and then drops the column at the end of the script. The first time it runs, it works fine because the column exists, then it gets dropped. The script breaks the 2nd time because the column no longer exists, even though the IF statement ensures that it won't run again. How do I get around SQL checking for this field?I have a SQL script that populates a temp colum