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Update SQL Keywords and Reserved Words to CAPS (#6421) #6423

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ti-chi-bot merged 1 commit into from
Jun 9, 2021
Merged

Update SQL Keywords and Reserved Words to CAPS (#6421) #6423

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8 changes: 4 additions & 4 deletions mysql-compatibility.md
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Expand Up @@ -49,7 +49,7 @@ aliases: ['/docs-cn/stable/mysql-compatibility/','/docs-cn/v4.0/mysql-compatibil

- TiDB 的自增列仅保证唯一，也能保证在单个 TiDB server 中自增，但不保证多个 TiDB server 中自增，不保证自动分配的值的连续性，建议不要将缺省值和自定义值混用，若混用可能会收 `Duplicated Error` 的错误信息。

- TiDB 可通过 `tidb_allow_remove_auto_inc` 系统变量开启或者关闭允许移除列的 `AUTO_INCREMENT` 属性。删除列属性的语法是：`alter table modify` 或 `alter table change`。
- TiDB 可通过 `tidb_allow_remove_auto_inc` 系统变量开启或者关闭允许移除列的 `AUTO_INCREMENT` 属性。删除列属性的语法是：`ALTER TABLE MODIFY` 或 `ALTER TABLE CHANGE`。

- TiDB 不支持添加列的 `AUTO_INCREMENT` 属性，移除该属性后不可恢复。

Expand All @@ -62,14 +62,14 @@ aliases: ['/docs-cn/stable/mysql-compatibility/','/docs-cn/v4.0/mysql-compatibil
> * 若创建表时没有指定主键时，TiDB 会使用 `_tidb_rowid` 来标识行，该数值的分配会和自增列（如果存在的话）共用一个分配器。如果指定了自增列为主键，则 TiDB 会用该列来标识行。因此会有以下的示例情况：

```sql
mysql> create table t(id int unique key AUTO_INCREMENT);
mysql> CREATE TABLE t(id INT UNIQUE KEY AUTO_INCREMENT);
Query OK, 0 rows affected (0.05 sec)

mysql> insert into t values(),(),();
mysql> INSERT INTO t VALUES(),(),();
Query OK, 3 rows affected (0.00 sec)
Records: 3 Duplicates: 0 Warnings: 0

mysql> select _tidb_rowid, id from t;
mysql> SELECT _tidb_rowid, id FROM t;
+-------------+------+
| _tidb_rowid | id |
+-------------+------+
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