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ebnf show charset #17035

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Apr 11, 2024
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ebnf show charset #17035

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ebnf show charset
dveeden Apr 8, 2024
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Update sql-statements/sql-statement-show-character-set.md
dveeden Apr 9, 2024
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46 changes: 39 additions & 7 deletions sql-statements/sql-statement-show-character-set.md
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Expand Up @@ -10,18 +10,22 @@ This statement provides a static list of available character sets in TiDB. The o

## Synopsis

**ShowCharsetStmt:**
```ebnf+diagram
ShowCharsetStmt ::=
"SHOW" ( ("CHARACTER" | "CHAR") | "CHARSET" ) ShowLikeOrWhere?
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![ShowCharsetStmt](/media/sqlgram/ShowCharsetStmt.png)

**CharsetKw:**

![CharsetKw](/media/sqlgram/CharsetKw.png)
ShowLikeOrWhere ::=
"LIKE" SimpleExpr
| "WHERE" Expression
```

## Examples

```sql
mysql> SHOW CHARACTER SET;
SHOW CHARACTER SET;
```

```
+---------+---------------+-------------------+--------+
| Charset | Description | Default collation | Maxlen |
+---------+---------------+-------------------+--------+
Expand All @@ -34,6 +38,34 @@ mysql> SHOW CHARACTER SET;
5 rows in set (0.00 sec)
```

```sql
SHOW CHARACTER SET LIKE 'utf8%';
```

```
+---------+---------------+-------------------+--------+
| Charset | Description | Default collation | Maxlen |
+---------+---------------+-------------------+--------+
| utf8 | UTF-8 Unicode | utf8_bin | 3 |
| utf8mb4 | UTF-8 Unicode | utf8mb4_bin | 4 |
+---------+---------------+-------------------+--------+
2 rows in set (0.00 sec)
```

```sql
SHOW CHARACTER SET WHERE Description='UTF-8 Unicode';
```

```
+---------+---------------+-------------------+--------+
| Charset | Description | Default collation | Maxlen |
+---------+---------------+-------------------+--------+
| utf8 | UTF-8 Unicode | utf8_bin | 3 |
| utf8mb4 | UTF-8 Unicode | utf8mb4_bin | 4 |
+---------+---------------+-------------------+--------+
2 rows in set (0.00 sec)
```

## MySQL compatibility

The usage of `SHOW CHARACTER SET` statement in TiDB is fully compatible with MySQL. However, charsets in TiDB might have different default collations compared with MySQL. For details, refer to [Compatibility with MySQL](/mysql-compatibility.md). If you find any compatibility differences, [report a bug](https://docs.pingcap.com/tidb/stable/support).
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