111 lines
4.0 KiB
Markdown
111 lines
4.0 KiB
Markdown
---
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{
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"title": "DROP MATERIALIZED VIEW",
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"language": "en"
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}
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---
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<!--
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Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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regarding copyright ownership. The ASF licenses this file
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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-->
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# DROP MATERIALIZED VIEW
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## description
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This statement is used to delete a materialized view. Synchronization syntax
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syntax:
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```
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DROP MATERIALIZED VIEW [IF EXISTS] mv_name ON table_name
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```
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1. IF EXISTS
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If the materialized view does not exist, doris will not throw an error. If this keyword is not declared, an error will be reported if the materialized view does not exist.
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Ranch
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2. mv_name
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The name of the materialized view to be deleted. Required.
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3. Table_name
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Name of the table to which the materialized view to be deleted belongs. Required.
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## example
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Table structure is
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```
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mysql> desc all_type_table all;
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+----------------+-------+----------+------+-------+---------+-------+
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| IndexName | Field | Type | Null | Key | Default | Extra |
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+----------------+-------+----------+------+-------+---------+-------+
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| all_type_table | k1 | TINYINT | Yes | true | N/A | |
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| | k2 | SMALLINT | Yes | false | N/A | NONE |
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| | k3 | INT | Yes | false | N/A | NONE |
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| | k4 | BIGINT | Yes | false | N/A | NONE |
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| | k5 | LARGEINT | Yes | false | N/A | NONE |
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| | k6 | FLOAT | Yes | false | N/A | NONE |
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| | k7 | DOUBLE | Yes | false | N/A | NONE |
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| | | | | | | |
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| k1_sumk2 | k1 | TINYINT | Yes | true | N/A | |
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| | k2 | SMALLINT | Yes | false | N/A | SUM |
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+----------------+-------+----------+------+-------+---------+-------+
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```
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1. Drop the materialized view named k1_sumk2 of the table all_type_table
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```
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drop materialized view k1_sumk2 on all_type_table;
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```
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Table structure after materialized view is deleted as following:
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```
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+----------------+-------+----------+------+-------+---------+-------+
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| IndexName | Field | Type | Null | Key | Default | Extra |
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+----------------+-------+----------+------+-------+---------+-------+
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| all_type_table | k1 | TINYINT | Yes | true | N/A | |
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| | k2 | SMALLINT | Yes | false | N/A | NONE |
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| | k3 | INT | Yes | false | N/A | NONE |
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| | k4 | BIGINT | Yes | false | N/A | NONE |
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| | k5 | LARGEINT | Yes | false | N/A | NONE |
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| | k6 | FLOAT | Yes | false | N/A | NONE |
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| | k7 | DOUBLE | Yes | false | N/A | NONE |
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+----------------+-------+----------+------+-------+---------+-------+
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```
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2. Delete a non-existing materialized view in the table all_type_table
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```
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drop materialized view k1_k2 on all_type_table;
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ERROR 1064 (HY000): errCode = 2, detailMessage = Materialized view [k1_k2] does not exist in table [all_type_table]
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```
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The delete request directly reports an error
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3. Delete the materialized view k1_k2 in the table all_type_table. Materialized view does not exist and no error is reported.
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```
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drop materialized view if exists k1_k2 on all_type_table;
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Query OK, 0 rows affected (0.00 sec)
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```
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If it exists, it will be deleted; If it does not exist, no error will be reported.
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## keyword
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DROP, MATERILIAZED, VIEW
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