文档目录

CREATE VIEW

使用 CREATE VIEW 语句将 SELECT 语句保存为类似于表的可查询对象。TiDB 中的视图是非物化的,这意味着在查询视图时,TiDB 将在内部重写查询,以将视图定义与 SQL 查询结合起来。

语法图

CreateViewStmt:

CreateViewStmt

OrReplace:

OrReplace

ViewAlgorithm:

ViewAlgorithm

ViewDefiner:

ViewDefiner

ViewSQLSecurity:

ViewSQLSecurity

ViewName:

ViewName

ViewFieldList:

ViewFieldList

ViewCheckOption:

ViewCheckOption

示例

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),(4),(5);
Query OK, 5 rows affected (0.03 sec)
Records: 5  Duplicates: 0  Warnings: 0
CREATE VIEW v1 AS SELECT * FROM t1 WHERE c1 > 2;
Query OK, 0 rows affected (0.11 sec)
SELECT * FROM t1;
+----+----+
| id | c1 |
+----+----+
|  1 |  1 |
|  2 |  2 |
|  3 |  3 |
|  4 |  4 |
|  5 |  5 |
+----+----+
5 rows in set (0.00 sec)
SELECT * FROM v1;
+----+----+
| id | c1 |
+----+----+
|  3 |  3 |
|  4 |  4 |
|  5 |  5 |
+----+----+
3 rows in set (0.00 sec)
INSERT INTO t1 (c1) VALUES (6);
Query OK, 1 row affected (0.01 sec)
SELECT * FROM v1;
+----+----+
| id | c1 |
+----+----+
|  3 |  3 |
|  4 |  4 |
|  5 |  5 |
|  6 |  6 |
+----+----+
4 rows in set (0.00 sec)
INSERT INTO v1 (c1) VALUES (7);
ERROR 1105 (HY000): insert into view v1 is not supported now.

MySQL 兼容性

  • 目前 TiDB 中的视图不可插入且不可更新。

另请参阅