UPDATE
UPDATE 语句用于修改指定表中的数据。
语法图
UpdateStmt:
TableRef:
TableRefs:
AssignmentList:
WhereClauseOptional:
示例
mysql> CREATE TABLE t1 (id INT NOT NULL PRIMARY KEY AUTO_INCREMENT, c1 INT NOT NULL);
Query OK, 0 rows affected (0.11 sec)
mysql> INSERT INTO t1 (c1) VALUES (1), (2), (3);
Query OK, 3 rows affected (0.02 sec)
Records: 3 Duplicates: 0 Warnings: 0
mysql> SELECT * FROM t1;
+----+----+
| id | c1 |
+----+----+
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
+----+----+
3 rows in set (0.00 sec)
mysql> UPDATE t1 SET c1=5 WHERE c1=3;
Query OK, 1 row affected (0.01 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> SELECT * FROM t1;
+----+----+
| id | c1 |
+----+----+
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
+----+----+
3 rows in set (0.00 sec)
MySQL 兼容性
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。