MySQL 更新内连接表查询

发布于11月09日

我不知道问题出在哪里.使用MySQL 5.0，我在try 运行以下MySQL更新查询时出现编译错误:

UPDATE  b
SET b.mapx = g.latitude,
    b.mapy = g.longitude
FROM business AS b
INNER JOIN business_geocode g ON b.business_id = g.business_id
WHERE (b.mapx = '' OR b.mapx = 0) AND
      g.latitude > 0

所有字段名都是正确的.有什么 idea 吗？

更新:

因为您说查询产生了语法错误，所以我创建了一些表，可以对其进行测试，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_geocode (business_geocode_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_geocode 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

看见没有语法错误.我对MySQL 5.5.8进行了测试.