复制代码 代码如下: table a columns(key,value); table b columns(key,value); SELECT a.* FROM a LEFT JOIN b ON a.key = b.key WHERE b.key IS NULL
复制代码 代码如下:table a columns(key,value); table b columns(key,value); SELECT a.* FROM a LEFT JOIN b ON a.key = b.key WHERE b.key IS NULL
