DROP VIEW
该语句用于从当前选择的数据库中删除视图对象。它不会影响视图所引用的任何基础表。
语法概要
- DropViewStmt
- TableNameList
- TableName
DropViewStmt ::=
'DROP' 'VIEW' ( 'IF' 'EXISTS' )? TableNameList RestrictOrCascadeOpt
TableNameList ::=
TableName ( ',' TableName )*
TableName ::=
Identifier ('.' Identifier)?
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),(4),(5);
Query OK, 5 rows affected (0.03 sec)
Records: 5 Duplicates: 0 Warnings: 0
mysql> CREATE VIEW v1 AS SELECT * FROM t1 WHERE c1 > 2;
Query OK, 0 rows affected (0.11 sec)
mysql> SELECT * FROM t1;
+----+----+
| id | c1 |
+----+----+
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 5 |
+----+----+
5 rows in set (0.00 sec)
mysql> SELECT * FROM v1;
+----+----+
| id | c1 |
+----+----+
| 3 | 3 |
| 4 | 4 |
| 5 | 5 |
+----+----+
3 rows in set (0.00 sec)
mysql> DROP VIEW v1;
Query OK, 0 rows affected (0.23 sec)
mysql> SELECT * FROM t1;
+----+----+
| id | c1 |
+----+----+
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 5 |
+----+----+
5 rows in set (0.00 sec)
MySQL 兼容性
TiDB 中的 DROP VIEW 语句与 MySQL 完全兼容。如果你发现任何兼容性差异，请报告一个 bug。