c是作为 select id,title from info14 union all select id,title from info15 union all select id,title from info16 union all select id,title from info17 union all select id,title from info18这个查询结果的别名...
select id,title from info14 union all select id,title from info15 union all select id,title from info16 union all select id,title from info17 union all select id,title from info18...
(select id,title from info14 union all select id,title from info15 union all select id,title from info16 union all select id,title from info17 union all select id,title from info18...
