例如,One mysql server machine A has One table called "tableA" under in a database called databaseA, anothermysql server machine B has one table called "tableB" under in a database called databaseB.如何加入tableA
我的问题是:MySQL抱怨说:
You have an error inyour SQL syntax; check the manual that corresponds to your MySQL server version for the right syntaxto use near 'INNER JOIN abc USING (abc_id) WHERE x <
我创建了这两个表: `GameGenre` varchar(20) NOT NULL,GameName`) ON DELETE CASCADE ON UPDATE CASCADE我的查询需要基于GameScoreTotal.OverallScoreTotal从游戏表中返回前十名游戏的所有信息我尝试过的查询:FROM Game
FULL JOIN<
这是很好的工作,但有3个表,大大减少了我的表现。在这种情况下,使用联接比多个请求具有更低的性能。JOIN PoiLink p14_ ON p0_.id = p14_.childId LEFT JOIN Poi p15_ ON p14_.parentId = p15_.id LEFT JOIN PersonJOIN Service s21_ ON p15_.id = s21_.id LEFT JOIN PoiLink p22_ ON p0_.id = p22_.parentId LEFT