eefad13107
This PR is to add inPredicate support to delete statement, and add max_allowed_in_element_num_of_delete variable to limit element num of InPredicate in delete statement.
63 lines
2.4 KiB
Markdown
63 lines
2.4 KiB
Markdown
---
|
|
{
|
|
"title": "DELETE",
|
|
"language": "en"
|
|
}
|
|
---
|
|
|
|
<!--
|
|
Licensed to the Apache Software Foundation (ASF) under one
|
|
or more contributor license agreements. See the NOTICE file
|
|
distributed with this work for additional information
|
|
regarding copyright ownership. The ASF licenses this file
|
|
to you under the Apache License, Version 2.0 (the
|
|
"License"); you may not use this file except in compliance
|
|
with the License. You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing,
|
|
software distributed under the License is distributed on an
|
|
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
|
|
KIND, either express or implied. See the License for the
|
|
specific language governing permissions and limitations
|
|
under the License.
|
|
-->
|
|
|
|
# DELETE
|
|
## Description
|
|
|
|
This statement is used to conditionally delete data in the specified table (base index) partition.
|
|
This action deletes the rollup index data associated with this base index at the same time.
|
|
Grammar:
|
|
DELETE FROM table_name [PARTITION partition_name]
|
|
WHERE
|
|
column_name1 op { value | value_list } [ AND column_name2 op { value | value_list } ...];
|
|
|
|
Explain:
|
|
1) Optional types of OP include: =, >, <, >=, <=, <=, <=, !=, in, not in
|
|
2) Conditions on key columns can only be specified.
|
|
2) When the selected key column does not exist in a rollup, delete cannot be performed.
|
|
3) The relationship between conditions can only be "and".
|
|
If you want to achieve the "or" relationship, you need to divide the conditions into two DELETE statements.
|
|
4) If you partition a table for RANGE, you must specify PARTITION. If it is a single partition table, you can not specify it.
|
|
|
|
Notice:
|
|
This statement may reduce query efficiency for a period of time after execution.
|
|
The degree of impact depends on the number of deletion conditions specified in the statement.
|
|
The more conditions specified, the greater the impact.
|
|
|
|
## example
|
|
|
|
1. Delete rows whose K1 column value is 3 in my_table partition p 1
|
|
DELETE FROM my_table PARTITION p1
|
|
WHERE k1 = 3;
|
|
|
|
2. Delete rows whose K1 column value is greater than or equal to 3 and whose K2 column value is "abc" in my_table partition P1
|
|
DELETE FROM my_table PARTITION p1
|
|
WHERE k1 >= 3 AND k2 = "abc";
|
|
|
|
## keyword
|
|
DELETE
|
|
|