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

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