auto-increment: Mention FORCE

Ref: pingcap/tidb#25400
ti-chi-bot · Apr 14, 2022 · 6fd2176 · 6fd2176
1 parent 2da602b
commit 6fd2176
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/auto-increment.md b/auto-increment.md
@@ -339,3 +339,4 @@ Currently, `AUTO_INCREMENT` has the following restrictions when used in TiDB:
 - It cannot be specified on the same column with the `DEFAULT` column value.
 - `ALTER TABLE` cannot be used to add the `AUTO_INCREMENT` attribute.
 - `ALTER TABLE` can be used to remove the `AUTO_INCREMENT` attribute. However, starting from v2.1.18 and v3.0.4, TiDB uses the session variable `@@tidb_allow_remove_auto_inc` to control whether `ALTER TABLE MODIFY` or `ALTER TABLE CHANGE` can be used to remove the `AUTO_INCREMENT` attribute of a column. By default, you cannot use `ALTER TABLE MODIFY` or `ALTER TABLE CHANGE` to remove the `AUTO_INCREMENT` attribute.
+- `ALTER TABLE` requires the `FORCE` option to set the `AUTO_INCREMENT` value to a lower value.