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system variables: document last_insert_id #6502

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Sep 29, 2021
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system variables: document last_insert_id #6502

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7 changes: 7 additions & 0 deletions system-variables.md
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Expand Up @@ -175,6 +175,13 @@ mysql> SELECT * FROM t1;
- Unit: Seconds
- This variable represents the idle timeout of the interactive user session, which is measured in seconds. Interactive user session refers to the session established by calling [`mysql_real_connect()`](https://dev.mysql.com/doc/c-api/5.7/en/mysql-real-connect.html) API using the `CLIENT_INTERACTIVE` option (for example, MySQL shell client). This variable is fully compatible with MySQL.

### last_insert_id

- Scope: SESSION
- Default value: `0`
- This variable returns the last `AUTO_INCREMENT` or `AUTO_RANDOM` value generated by an insert statement.
- The value of `last_insert_id` is the same as the value returned by the function `LAST_INSERT_ID()`.

### last_plan_from_binding <span class="version-mark">New in v4.0</span>

- Scope: SESSION
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