单个表的删除: DELETE FROM tableName WHERE columnName = value; 删除表内的所有行: 即:保留表的结构、属性、索引 DELETE FROM tablename; DELETE * FROM tablename; 删除同一张表内的所有内容(删除数据、表结构) TRUNCATE customer; 无法报告删除了几行,且只能用于单一表 多表连接删除: DELETE orders,itrms FROM orders,items WHERE orders.userid = items.userid AND orders.orderid = i