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ebnf show columns from #17087

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ebnf show columns from #17087

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ebnf show columns from
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Update sql-statements/sql-statement-show-columns-from.md
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62 changes: 17 additions & 45 deletions sql-statements/sql-statement-show-columns-from.md
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Expand Up @@ -16,101 +16,73 @@ The statements `SHOW [FULL] FIELDS FROM <table_name>`, `DESC <table_name>`, `DES

## Synopsis

**ShowStmt:**
```ebnf+diagram
ShowColumnsFromStmt ::=
"SHOW" "FULL"? ("COLUMNS" | "FIELDS") ("FROM" | "IN") TableName ("FROM" | "IN" SchemaName)? ShowLikeOrWhereOpt?
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![ShowStmt](/media/sqlgram/ShowStmt.png)
TableName ::=
(Identifier ".")? Identifier

**ShowColumnsFilterable:**

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

**OptFull:**

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

**FieldsOrColumns:**

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

**ShowTableAliasOpt:**

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

**FromOrIn:**

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

**TableName:**

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

**ShowDatabaseNameOpt:**

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

**DBName:**

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

**ShowLikeOrWhereOpt:**

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

## Examples

```sql
mysql> create view v1 as select 1;
mysql> CREATE VIEW v1 AS SELECT 1;
Query OK, 0 rows affected (0.11 sec)

mysql> show columns from v1;
mysql> SHOW COLUMNS FROM v1;
+-------+-----------+------+------+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+-----------+------+------+---------+-------+
| 1 | bigint(1) | YES | | NULL | |
+-------+-----------+------+------+---------+-------+
1 row in set (0.00 sec)

mysql> desc v1;
mysql> DESC v1;
+-------+-----------+------+------+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+-----------+------+------+---------+-------+
| 1 | bigint(1) | YES | | NULL | |
+-------+-----------+------+------+---------+-------+
1 row in set (0.00 sec)

mysql> describe v1;
mysql> DESCRIBE v1;
+-------+-----------+------+------+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+-----------+------+------+---------+-------+
| 1 | bigint(1) | YES | | NULL | |
+-------+-----------+------+------+---------+-------+
1 row in set (0.00 sec)

mysql> explain v1;
mysql> EXPLAIN v1;
+-------+-----------+------+------+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+-----------+------+------+---------+-------+
| 1 | bigint(1) | YES | | NULL | |
+-------+-----------+------+------+---------+-------+
1 row in set (0.00 sec)

mysql> show fields from v1;
mysql> SHOW FIELDS FROM v1;
+-------+-----------+------+------+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+-----------+------+------+---------+-------+
| 1 | bigint(1) | YES | | NULL | |
+-------+-----------+------+------+---------+-------+
1 row in set (0.00 sec)

mysql> show full columns from v1;
mysql> SHOW FULL COLUMNS FROM v1;
+-------+-----------+-----------+------+------+---------+-------+---------------------------------+---------+
| Field | Type | Collation | Null | Key | Default | Extra | Privileges | Comment |
+-------+-----------+-----------+------+------+---------+-------+---------------------------------+---------+
| 1 | bigint(1) | NULL | YES | | NULL | | select,insert,update,references | |
+-------+-----------+-----------+------+------+---------+-------+---------------------------------+---------+
1 row in set (0.00 sec)

mysql> show full columns from mysql.user;
mysql> SHOW FULL COLUMNS FROM mysql.user;
+------------------------+---------------+-------------+------+------+---------+-------+---------------------------------+---------+
| Field | Type | Collation | Null | Key | Default | Extra | Privileges | Comment |
+------------------------+---------------+-------------+------+------+---------+-------+---------------------------------+---------+
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