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10 changes: 5 additions & 5 deletions sql-statements/sql-statement-drop-sequence.md
Original file line number Diff line number Diff line change
Expand Up @@ -15,10 +15,6 @@ aliases: ['/docs-cn/dev/reference/sql/statements/drop-sequence/']

![DropSequenceStmt](/media/sqlgram/DropSequenceStmt.png)

**OptTemporary:**

![OptTemporary](/media/sqlgram/OptTemporary.png)

**IfExists:**

![IfExists](/media/sqlgram/IfExists.png)
Expand All @@ -27,6 +23,10 @@ aliases: ['/docs-cn/dev/reference/sql/statements/drop-sequence/']

![TableNameList](/media/sqlgram/TableNameList.png)

**TableName:**

![TableName](/media/sqlgram/TableName.png)

## 示例

{{< copyable "sql" >}}
Expand All @@ -51,7 +51,7 @@ Query OK, 0 rows affected (0.03 sec)

## MySQL 兼容性

MySQL 暂无序列选项。TiDB 序列借鉴自 MariaDB。`SETVAL` 函数的步调是 TiDB 特有的,其他函数的步调与 MariaDB 保持一致
MySQL 暂无序列功能

## 另请参阅

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11 changes: 4 additions & 7 deletions sql-statements/sql-statement-show-character-set.md
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Expand Up @@ -11,13 +11,9 @@ aliases: ['/docs-cn/dev/reference/sql/statements/show-character-set/']

## 语法图

**ShowStmt:**
**ShowCharsetStmt:**

![ShowStmt](/media/sqlgram/ShowStmt.png)

**ShowTargetFilterable:**

![ShowTargetFilterable](/media/sqlgram/ShowTargetFilterable.png)
![ShowCharsetStmt](/media/sqlgram/ShowCharsetStmt.png)

**CharsetKw:**

Expand Down Expand Up @@ -46,8 +42,9 @@ SHOW CHARACTER SET;

## MySQL 兼容性

`SHOW CHARACTER SET` 语句与 MySQL 完全兼容。如有任何兼容性差异,请在 GitHub 上提交 [issue](/report-issue.md)。
`SHOW CHARACTER SET` 语句功能与 MySQL 完全兼容。注意,TiDB 中字符集的默认排序规则与 MySQL 有所不同,具体可以参考[与 MySQL 兼容性对比](/mysql-compatibility.md#默认设置)。对于其他问题导致的兼容性差异,请在 GitHub 上提交 [issue](/report-issue.md)。

## 另请参阅

* [SHOW COLLATION](/sql-statements/sql-statement-show-collation.md)
* [字符集和排序规则](/character-set-and-collation.md)
274 changes: 43 additions & 231 deletions sql-statements/sql-statement-show-collation.md

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