# mysql.help\_category Table
`mysql.help_category` is one of the four tables used by the [HELP command](/docs/server/reference/sql-statements/administrative-sql-statements/help-command.md). It is populated when the server is installed by the `fill_help_tables.sql` script. The other help tables are [help\_relation](/docs/server/reference/system-tables/the-mysql-database-tables/mysql-help_relation-table.md), [help\_topic](/docs/server/reference/system-tables/the-mysql-database-tables/mysql-help_topic-table.md) and [help\_keyword](/docs/server/reference/system-tables/the-mysql-database-tables/mysql-help_keyword-table.md).
This table uses the [Aria](/docs/server/server-usage/storage-engines/aria.md) storage engine.
The `mysql.help_category` table contains the following fields:
| Field | Type | Null | Key | Default | Description |
| -------------------- | -------------------- | ---- | --- | ------- | ----------- |
| help\_category\_id | smallint(5) unsigned | NO | PRI | NULL | |
| name | char(64) | NO | UNI | NULL | |
| parent\_category\_id | smallint(5) unsigned | YES | | NULL | |
| url | char(128) | NO | | NULL | |
## Example
```sql
SELECT * FROM help_category;
+------------------+-----------------------------------------------+--------------------+-----+
| help_category_id | name | parent_category_id | url |
+------------------+-----------------------------------------------+--------------------+-----+
| 1 | Geographic | 0 | |
| 2 | Polygon properties | 34 | |
| 3 | WKT | 34 | |
| 4 | Numeric Functions | 38 | |
| 5 | Plugins | 35 | |
| 6 | MBR | 34 | |
| 7 | Control flow functions | 38 | |
| 8 | Transactions | 35 | |
| 9 | Help Metadata | 35 | |
| 10 | Account Management | 35 | |
| 11 | Point properties | 34 | |
| 12 | Encryption Functions | 38 | |
| 13 | LineString properties | 34 | |
| 14 | Miscellaneous Functions | 38 | |
| 15 | Logical operators | 38 | |
| 16 | Functions and Modifiers for Use with GROUP BY | 35 | |
| 17 | Information Functions | 38 | |
| 18 | Comparison operators | 38 | |
| 19 | Bit Functions | 38 | |
| 20 | Table Maintenance | 35 | |
| 21 | User-Defined Functions | 35 | |
| 22 | Data Types | 35 | |
| 23 | Compound Statements | 35 | |
| 24 | Geometry constructors | 34 | |
| 25 | GeometryCollection properties | 1 | |
| 26 | Administration | 35 | |
| 27 | Data Manipulation | 35 | |
| 28 | Utility | 35 | |
| 29 | Language Structure | 35 | |
| 30 | Geometry relations | 34 | |
| 31 | Date and Time Functions | 38 | |
| 32 | WKB | 34 | |
| 33 | Procedures | 35 | |
| 34 | Geographic Features | 35 | |
| 35 | Contents | 0 | |
| 36 | Geometry properties | 34 | |
| 37 | String Functions | 38 | |
| 38 | Functions | 35 | |
| 39 | Data Definition | 35 | |
+------------------+-----------------------------------------------+--------------------+-----+
```
*This page is licensed: CC BY-SA / Gnu FDL*
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