sql,sql-server,sql-server-2008,tsql,stored-procedures , copy table and drop it


copy table and drop it

Question:

Tag: sql,sql-server,sql-server-2008,tsql,stored-procedures

I know we can simply create a new table and copy the old table by doing

select * into tbl2 from tbl1

i would like to check if table tbl2 exists, if it does then copy all the rows, if it doesn't then create a new one without having to specify the column names in tbl2 since I'm copying all the columns from tbl2 in tbl1. then, I would like to drop old table(tbl1)

if not exists(select * from tbl1 where id = 1)
   create table tbl2()
   drop tbl1
go

Answer:
IF (EXISTS (SELECT * 
         FROM INFORMATION_SCHEMA.TABLES 
         WHERE TABLE_NAME = 'tbl2'))
BEGIN
    -- tbl2 exists, so just copy rows
    INSERT INTO tbl2 SELECT * FROM tbl1;
END
ELSE BEGIN
    -- tbl2 doesn't exist, so create new table tbl2 and copy rows 
    SELECT * INTO tbl2 FROM tbl1;
    DROP tbl1;
END

This won't copy indexes, keys, etc though - just the column names on create (in the else branch).


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