sql动态创建多列

DECLARE @C CHARACTER(20) /*声明列*/
DECLARE @NUM INT     /*声明创建指定行数*/
DECLARE @sql CHARACTER(500) /*声明执行sql语句*/
SET @NUM = 10 /*定义为10列*/
WHILE ( @NUM > 0 ) 
    BEGIN 
        SET @C = CONVERT(CHARACTER(10), @NUM) /*设置列*/
        SET @sql = ‘ALTER TABLE dbo.Table_1 ADD colu‘ + @C + ‘ CHARACTER(50)‘/*设置sql语句*/
        EXEC(@sql) /*执行sql语句*/
        SET @NUM = @NUM - 1 /*递减*/
    END