From 23ef9acf73b15db4ef6c793212d5bd0d5e4535e3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dani=C3=ABl=20van=20Eeden?= <git@myname.nl>
Date: Mon, 8 Apr 2024 11:31:33 +0200
Subject: [PATCH 1/2] ebnf show charset

---
 .../sql-statement-show-character-set.md       | 46 ++++++++++++++++---
 1 file changed, 39 insertions(+), 7 deletions(-)

diff --git a/sql-statements/sql-statement-show-character-set.md b/sql-statements/sql-statement-show-character-set.md
index 478ed1fa5b98f..65a137189febc 100644
--- a/sql-statements/sql-statement-show-character-set.md
+++ b/sql-statements/sql-statement-show-character-set.md
@@ -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?
 
-![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 |
 +---------+---------------+-------------------+--------+
@@ -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).

From 494673224b26edf174a8a1045e8975cc09f111eb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dani=C3=ABl=20van=20Eeden?= <github@myname.nl>
Date: Tue, 9 Apr 2024 08:07:52 +0200
Subject: [PATCH 2/2] Update sql-statements/sql-statement-show-character-set.md

Co-authored-by: kennytm <kennytm@gmail.com>
---
 sql-statements/sql-statement-show-character-set.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sql-statements/sql-statement-show-character-set.md b/sql-statements/sql-statement-show-character-set.md
index 65a137189febc..f6b192afaca3c 100644
--- a/sql-statements/sql-statement-show-character-set.md
+++ b/sql-statements/sql-statement-show-character-set.md
@@ -12,7 +12,7 @@ This statement provides a static list of available character sets in TiDB. The o
 
 ```ebnf+diagram
 ShowCharsetStmt ::=
-    "SHOW" ( ("CHARACTER" | "CHAR") | "CHARSET" ) ShowLikeOrWhere?
+    "SHOW" ( ("CHARACTER" | "CHAR") "SET" | "CHARSET" ) ShowLikeOrWhere?
 
 ShowLikeOrWhere ::=
     "LIKE" SimpleExpr