DROP MATERIALIZED VIEW
Descriptionβ
This statement is used to drop a materialized view. Synchronous syntax
grammar:
DROP MATERIALIZED VIEW [IF EXISTS] mv_name ON table_name;
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IF EXISTS: Do not throw an error if the materialized view does not exist. If this keyword is not declared, an error will be reported if the materialized view does not exist.
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mv_name: The name of the materialized view to delete. Required.
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table_name: The name of the table to which the materialized view to be deleted belongs. Required.
Examplesβ
The table structure is
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 |
+----------------+-------+----------+------+------ -+---------+-------+
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Drop the materialized view named k1_sumk2 of the table all_type_table
drop materialized view k1_sumk2 on all_type_table;
The table structure after the materialized view is deleted
+----------------+-------+----------+------+------ -+---------+-------+
| 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 |
+----------------+-------+----------+------+------ -+---------+-------+ -
Drop a non-existent materialized view in the table all_type_table
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]The delete request reports an error directly
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Delete the materialized view k1_k2 in the table all_type_table, if it does not exist, no error will be reported.
drop materialized view if exists k1_k2 on all_type_table;
Query OK, 0 rows affected (0.00 sec)If it exists, delete it, if it does not exist, no error is reported.
Keywordsβ
DROP, MATERIALIZED, VIEW