UPDATE

UPDATE 语句用于修改指定表中的数据。

语法图

UpdateStmt:

UpdateStmt

TableRef:

TableRef

TableRefs:

TableRefs

AssignmentList:

AssignmentList

WhereClauseOptional:

WhereClauseOptional

CREATE TABLE t1 (id INT NOT NULL PRIMARY KEY AUTO_INCREMENT, c1 INT NOT NULL);

Query OK, 0 rows affected (0.11 sec)

INSERT INTO t1 (c1) VALUES (1), (2), (3);

Query OK, 3 rows affected (0.02 sec)
Records: 3  Duplicates: 0  Warnings: 0

SELECT * FROM t1;

+----+----+
| id | c1 |
+----+----+
|  1 |  1 |
|  2 |  2 |
|  3 |  3 |
+----+----+
3 rows in set (0.00 sec)

UPDATE t1 SET c1=5 WHERE c1=3;

Query OK, 1 row affected (0.01 sec)
Rows matched: 1  Changed: 1  Warnings: 0

SELECT * FROM t1;

+----+----+
| id | c1 |
+----+----+
|  1 |  1 |
|  2 |  2 |
|  3 |  5 |
+----+----+
3 rows in set (0.00 sec)

UPDATE 语句与 MySQL 完全兼容。如发现任何兼容性差异，请在 GitHub 上提交 issue。