DROP-MATERIALIZED-VIEW

Name

DROP MATERIALIZED VIEW

Description

该语句用于删除物化视图。同步语法

语法：

1. DROP MATERIALIZED VIEW [IF EXISTS] mv_name ON table_name;
  1. IF EXISTS: 如果物化视图不存在，不要抛出错误。如果不声明此关键字，物化视图不存在则报错。
  2. mv_name: 待删除的物化视图的名称。必填项。
  3. table_name: 待删除的物化视图所属的表名。必填项。

Example

表结构为

1. mysql> desc all_type_table all;
2. +----------------+-------+----------+------+-------+---------+-------+
3. | IndexName      | Field | Type     | Null | Key   | Default | Extra |
4. +----------------+-------+----------+------+-------+---------+-------+
5. | all_type_table | k1    | TINYINT  | Yes  | true  | N/A     |       |
6. |                | k2    | SMALLINT | Yes  | false | N/A     | NONE  |
7. |                | k3    | INT      | Yes  | false | N/A     | NONE  |
8. |                | k4    | BIGINT   | Yes  | false | N/A     | NONE  |
9. |                | k5    | LARGEINT | Yes  | false | N/A     | NONE  |
10. |                | k6    | FLOAT    | Yes  | false | N/A     | NONE  |
11. |                | k7    | DOUBLE   | Yes  | false | N/A     | NONE  |
12. |                |       |          |      |       |         |       |
13. | k1_sumk2       | k1    | TINYINT  | Yes  | true  | N/A     |       |
14. |                | k2    | SMALLINT | Yes  | false | N/A     | SUM   |
15. +----------------+-------+----------+------+-------+---------+-------+
  1. 删除表 all_type_table 的名为 k1_sumk2 的物化视图

1. drop materialized view k1_sumk2 on all_type_table;

物化视图被删除后的表结构

1. +----------------+-------+----------+------+-------+---------+-------+ 2. | IndexName | Field | Type | Null | Key | Default | Extra | 3. +----------------+-------+----------+------+-------+---------+-------+ 4. | all_type_table | k1 | TINYINT | Yes | true | N/A | | 5. | | k2 | SMALLINT | Yes | false | N/A | NONE | 6. | | k3 | INT | Yes | false | N/A | NONE | 7. | | k4 | BIGINT | Yes | false | N/A | NONE | 8. | | k5 | LARGEINT | Yes | false | N/A | NONE | 9. | | k6 | FLOAT | Yes | false | N/A | NONE | 10. | | k7 | DOUBLE | Yes | false | N/A | NONE | 11. +----------------+-------+----------+------+-------+---------+-------+ 2. 删除表 all_type_table 中一个不存在的物化视图

1. drop materialized view k1_k2 on all_type_table; 2. ERROR 1064 (HY000): errCode = 2, detailMessage = Materialized view [k1_k2] does not exist in table [all_type_table]

删除请求直接报错 3. 删除表 all_type_table 中的物化视图 k1_k2，不存在不报错。

1. drop materialized view if exists k1_k2 on all_type_table; 2. Query OK, 0 rows affected (0.00 sec)

存在则删除，不存在则不报错。

Keywords

1. DROP, MATERIALIZED, VIEW

Best Practice