摘要: SELECT语句的完整语法为: (7) SELECT (8) DISTINCT <select_list>(1) FROM <left_table>(3) <join_type> JOIN <right_table>(2) ON <join_condition>(4) WHERE <where_co 阅读全文
posted @ 2019-06-05 20:22 绘画者 阅读(1138) 评论(0) 推荐(0) 编辑