74a482ca7f
After this PR #9272, the `docs/build_help_zip.sh` will run failed. This PR fix this issue. But the help module still has some parse problem, I will fix it in next PR. This CL mainly changes: 1. fix `docs/build_help_zip.sh` error 2. remove `sql-reference-v2` to `sql-reference` 3. modify build extension github action to run `docs/build_help_zip.sh`
2.2 KiB
2.2 KiB
title, language
| title | language |
|---|---|
| UPDATE | en |
UPDATE
Name
UPDATE
Description
This statement is used to update the data (the update statement currently only supports the Unique Key model).
UPDATE table_name
SET assignment_list
WHERE expression
value:
{expr | DEFAULT}
assignment:
col_name = value
assignment_list:
assignment [, assignment] ...
Parameters
- table_name: The target table of the data to be updated. Can be of the form 'db_name.table_name'
- assignment_list: The target column to be updated, in the format 'col_name = value, col_name = value'
- where expression: the condition that is expected to be updated, an expression that returns true or false can be
Note
The current UPDATE statement only supports row updates on the Unique model, and there may be data conflicts caused by concurrent updates. At present, Doris does not deal with such problems, and users need to avoid such problems from the business side.
Example
The test table is a unique model table, which contains four columns: k1, k2, v1, v2. Where k1, k2 are keys, v1, v2 are values, and the aggregation method is Replace.
- Update the v1 column in the 'test' table that satisfies the conditions k1 =1 , k2 =2 to 1
UPDATE test SET v1 = 1 WHERE k1=1 and k2=2;
- Increment the v1 column of the k1=1 column in the 'test' table by 1
UPDATE test SET v1 = v1+1 WHERE k1=1;
Keywords
UPDATE