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Jun 19, 2020
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update several sql statement docs (#2836) #2964

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10 changes: 5 additions & 5 deletions sql-statements/sql-statement-drop-sequence.md
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Expand Up @@ -15,10 +15,6 @@ The `DROP SEQUENCE` statement drops the sequence object in TiDB.

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

**OptTemporary:**

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

**IfExists:**

![IfExists](/media/sqlgram/IfExists.png)
Expand All @@ -27,6 +23,10 @@ The `DROP SEQUENCE` statement drops the sequence object in TiDB.

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

**TableName:**

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

## Examples

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

## MySQL compatibility

Currently, MySQL does not have the sequence option. The TiDB sequence is borrowed from MariaDB. Except for the `SETVAL` function, all other functions have the same progressions with those functions of MariaDB.
Currently, sequence object is not supported by MySQL.

## See also

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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 @@ This statement provides a static list of available character sets in TiDB. The o

## Synopsis

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

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

**ShowTargetFilterable:**

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

**CharsetKw:**

Expand All @@ -41,8 +37,9 @@ mysql> SHOW CHARACTER SET;

## MySQL compatibility

This statement is understood to be fully compatible with MySQL. Any compatibility differences should be [reported via an issue](/report-issue.md) on GitHub.
The usage of this statement is understood to be fully compatible with MySQL. However, charsets in TiDB may have different default collations compared with MySQL. For details, refer to [Compatibility with MySQL](/mysql-compatibility.md). Any other compatibility differences should be [reported via an issue](/report-issue.md) on GitHub.

## See also

* [SHOW COLLATION](/sql-statements/sql-statement-show-collation.md)
* [Character Set and Collation](/character-set-and-collation.md)
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