更新连接另一个表的表

Question

更新一个表加入另外一个表.

UPDATE t1 SET  t1.col1 =1 FROM table1 t1 JOIN  table2 t2 
ON t1.ID=t2.ID
WHERE t1.Name='Test' AND t2.Age=25;

我收到此错误,您的SQL语法中有错误; 查看与您的MySQL服务器版本对应的手册,以便在'FROM table1 t1 JOIN table2 t2附近使用正确的语法...

有什么想法吗？

谢谢.

Answer 1

声明中不应该有一个FROM子句UPDATE,该SET子句应遵循完整的表引用:

UPDATE  table1 t1 
JOIN    table2 t2 ON t1.ID = t2.ID
SET     t1.col1 = 1
WHERE   t1.Name = 'Test' AND t2.Age = 25;

测试用例:

CREATE TABLE table1 (id int, col1 int, name varchar(20));
CREATE TABLE table2 (id int, age int);

INSERT INTO table1 VALUES (1, 0, 'Test');
INSERT INTO table1 VALUES (2, 0, 'Test');
INSERT INTO table1 VALUES (3, 0, 'No Test');

INSERT INTO table2 VALUES (1, 20);
INSERT INTO table2 VALUES (2, 25);
INSERT INTO table2 VALUES (3, 25);

结果:

SELECT * FROM table1;
+------+------+---------+
| id   | col1 | name    |
+------+------+---------+
|    1 |    0 | Test    |
|    2 |    1 | Test    |
|    3 |    0 | No Test |
+------+------+---------+
3 rows in set (0.00 sec)