排序结果因mysql中的内连接和左连接而异
我刚刚在一个查询中发现了这个不规则的问题,为什么在使用内连接和左连接时结果不同?例如,结果是在临时命中表和最终查询中排序的吗?
我举了一个例子来说明问题:
# cleanup
drop temporary table if exists ids;
drop temporary table if exists arts;
# create temporary tables
create temporary table arts ( id int, title varchar(100), posted datetime );
create temporary table ids ( id int, artid int );
# insert dummy articles
insert into arts ( id, title, posted ) VALUES ( 1, 'a', '2010-04-01' );
insert into arts ( id, title, posted ) VALUES ( 2, 'b', '2010-07-01' );
insert into arts ( id, title, posted ) VALUES ( 3, 'c', '2010-06-01' );
insert into arts ( id, title, posted ) VALUES ( 4, 'd', '2010-08-01' );
# insert ordered list of hits
insert into ids ( id, artid ) values ( 1, 4 );
insert into ids ( id, artid ) values ( 2, 2 );
insert into ids ( id, artid ) values ( 3, 3 );
insert into ids ( id, artid ) values ( 4, 1 );
# execute queries
select i.artid, a.posted from ids i left join arts a on a.id = i.artid;
select i.artid, a.posted from ids i inner join arts a on a.id = i.artid;
# cleanup
drop temporary table if exists arts;
drop temporary table if exists ids;
第一个查询返回:
4,2,3,1 (as expected, ordered by posted-column descending)
第二个回归:
1,2,3,4 (ordered by pk?)
没有找到相关结果
已邀请:
1 个回复
琶竞捆栓