摘要:
--1.向已有表中增加一列ALTER TABLE TableName ADD ColumnName VARCHAR(20) NULL--2.删除表中的某一列ALTER TABLE TableName DROP COLUMN ColumnName--3.修改某一列的数据类型ALTER TABLE Ta... 阅读全文
摘要:
SELECT replace(ltrim(rtrim(Realname)),' ','') AS RealnameFROM UserInfoWHERE replace(ltrim(rtrim(Realname)),' ','') ='张飞' 阅读全文