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