Question

我不知道问题是什么。使用MySQL 5.0，在尝试运行以下MYSQL更新语句时出现编译错误

  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

所有字段名称都是正确的。有什么想法吗？

Answer 1

试试这个：

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

更新

由于您说查询产生了语法错误，因此我创建了一些可以对其进行测试的表，并确认我的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

请参阅？没有语法错误。我测试了MySQL 5.5.8。

Answer 2

SET子句应在表规范之后。

UPDATE business AS b INNER JOIN business_geocode 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

Answer 3

对于MySql WorkBench，请使用以下内容：

update emp as a
inner join department b on a.department_id=b.id
set a.department_name=b.name
where a.emp_id in (10,11,12);

MYSQL更新语句内部联接表

3 个答案:

更新