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)
  3. mysql> INSERT INTO t1 (c1) VALUES (1),(2),(3),(4),(5);
  4. Query OK, 5 rows affected (0.03 sec)
  5. Records: 5 Duplicates: 0 Warnings: 0
  6. mysql> CREATE VIEW v1 AS SELECT * FROM t1 WHERE c1 > 2;
  7. Query OK, 0 rows affected (0.11 sec)
  8. mysql> SELECT * FROM t1;
  9. +-+-+
  10. | id | c1 |
  11. +-+-+
  12. | 1 | 1 |
  13. | 2 | 2 |
  14. | 3 | 3 |
  15. | 4 | 4 |
  16. | 5 | 5 |
  17. +-+-+
  18. 5 rows in set (0.00 sec)
  19. mysql> SELECT * FROM v1;
  20. +-+-+
  21. | id | c1 |
  22. +-+-+
  23. | 3 | 3 |
  24. | 4 | 4 |
  25. | 5 | 5 |
  26. +-+-+
  27. 3 rows in set (0.00 sec)
  28. mysql> INSERT INTO t1 (c1) VALUES (6);
  29. Query OK, 1 row affected (0.01 sec)
  30. mysql> SELECT * FROM v1;
  31. +-+-+
  32. | id | c1 |
  33. +-+-+
  34. | 3 | 3 |
  35. | 4 | 4 |
  36. | 5 | 5 |
  37. | 6 | 6 |
  38. +-+-+
  39. 4 rows in set (0.00 sec)
  40. mysql> INSERT INTO v1 (c1) VALUES (7);
  41. 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