MYSQL更新语句内部联接表

尝试这个：

UPDATE business AS bINNER JOIN business_geopre AS g ON b.business_id = g.business_idSET b.mapx = g.latitude,  b.mapy = g.longitudeWHERe  (b.mapx = '' or b.mapx = 0) and  g.latitude > 0

既然您说查询产生了语法错误，所以我创建了一些可以对其进行测试的表，并确认查询中没有语法错误：

mysql> create table business (business_id int unsigned primary key auto_increment, mapx varchar(255), mapy varchar(255)) engine=innodb;Query OK, 0 rows affected (0.01 sec)mysql> create table business_geopre (business_geopre_id int unsigned primary key auto_increment, business_id int unsigned not null, latitude varchar(255) not null, longitude varchar(255) not null, foreign key (business_id) references business(business_id)) engine=innodb;Query OK, 0 rows affected (0.01 sec)mysql> UPDATE business AS b    -> INNER JOIN business_geopre AS g ON b.business_id = g.business_id    -> SET b.mapx = g.latitude,    ->   b.mapy = g.longitude    -> WHERe  (b.mapx = '' or b.mapx = 0) and    ->   g.latitude > 0;Query OK, 0 rows affected (0.00 sec)Rows matched: 0  Changed: 0  Warnings: 0

看到？没有语法错误。我针对MySQL 5.5.8进行了测试。