DROP-MATERIALIZED-VIEW
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:
DROP MATERIALIZED VIEW [IF EXISTS] mv_name ON table_name;
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。
mv_name: 待删除的物化视图的名称。必填项。
table_name: 待删除的物化视图所属的表名。必填项。
Example
表结构为
mysql> desc all_type_table all;
+----------------+-------+----------+------+-------+---------+-------+
| IndexName | Field | Type | Null | Key | Default | Extra |
+----------------+-------+----------+------+-------+---------+-------+
| all_type_table | k1 | TINYINT | Yes | true | N/A | |
| | k2 | SMALLINT | Yes | false | N/A | NONE |
| | k3 | INT | Yes | false | N/A | NONE |
| | k4 | BIGINT | Yes | false | N/A | NONE |
| | k5 | LARGEINT | Yes | false | N/A | NONE |
| | k6 | FLOAT | Yes | false | N/A | NONE |
| | k7 | DOUBLE | Yes | false | N/A | NONE |
| | | | | | | |
| k1_sumk2 | k1 | TINYINT | Yes | true | N/A | |
| | k2 | SMALLINT | Yes | false | N/A | SUM |
+----------------+-------+----------+------+-------+---------+-------+
删除表 all_type_table 的名为 k1_sumk2 的物化视图
drop materialized view k1_sumk2 on all_type_table;
物化视图被删除后的表结构
+----------------+-------+----------+------+-------+---------+-------+
| IndexName | Field | Type | Null | Key | Default | Extra |
+----------------+-------+----------+------+-------+---------+-------+
| all_type_table | k1 | TINYINT | Yes | true | N/A | |
| | k2 | SMALLINT | Yes | false | N/A | NONE |
| | k3 | INT | Yes | false | N/A | NONE |
| | k4 | BIGINT | Yes | false | N/A | NONE |
| | k5 | LARGEINT | Yes | false | N/A | NONE |
| | k6 | FLOAT | Yes | false | N/A | NONE |
| | k7 | DOUBLE | Yes | false | N/A | NONE |
+----------------+-------+----------+------+-------+---------+-------+删除表 all_type_table 中一个不存在的物化视图
drop materialized view k1_k2 on all_type_table;
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
删除表 all_type_table 中的物化视图 k1_k2,不存在不报错。
drop materialized view if exists k1_k2 on all_type_table;
Query OK, 0 rows affected (0.00 sec)存在则删除,不存在则不报错。
Keywords
DROP, MATERIALIZED, VIEW