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

  1. mysql> CREATE TABLE t1 (id INT NOT NULL PRIMARY KEY auto_increment, c1 INT NOT NULL);
  2. Query OK, 0 rows affected (0.11 sec)
  4. mysql> INSERT INTO t1 (c1) VALUES (1),(2),(3),(4),(5);
  5. Query OK, 5 rows affected (0.03 sec)
  6. Records: 5  Duplicates: 0  Warnings: 0
  8. mysql> CREATE VIEW v1 AS SELECT * FROM t1 WHERE c1 > 2;
  9. Query OK, 0 rows affected (0.11 sec)
  11. mysql> SELECT * FROM t1;
  12. +-+-+
  13. | id | c1 |
  14. +-+-+
  15. |  1 |  1 |
  16. |  2 |  2 |
  17. |  3 |  3 |
  18. |  4 |  4 |
  19. |  5 |  5 |
  20. +-+-+
  21. 5 rows in set (0.00 sec)
  23. mysql> SELECT * FROM v1;
  24. +-+-+
  25. | id | c1 |
  26. +-+-+
  27. |  3 |  3 |
  28. |  4 |  4 |
  29. |  5 |  5 |
  30. +-+-+
  31. 3 rows in set (0.00 sec)
  33. mysql> INSERT INTO t1 (c1) VALUES (6);
  34. Query OK, 1 row affected (0.01 sec)
  36. mysql> SELECT * FROM v1;
  37. +-+-+
  38. | id | c1 |
  39. +-+-+
  40. |  3 |  3 |
  41. |  4 |  4 |
  42. |  5 |  5 |
  43. |  6 |  6 |
  44. +-+-+
  45. 4 rows in set (0.00 sec)
  47. mysql> INSERT INTO v1 (c1) VALUES (7);
  48. 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