mysql.help_category Table

mysql.help_category is one of the four tables used by the HELP command. It is populated when the server is installed by the fill_help_table.sql script. The other help tables are help_relation, help_topic and help_keyword.

MariaDB starting with 10.4

In MariaDB 10.4 and later, this table uses the Aria storage engine.

MariaDB until 10.3

In MariaDB 10.3 and before, this table uses the MyISAM storage engine.

The mysql.help_category table contains the following fields:

FieldTypeNullKeyDefaultDescription
help_category_idsmallint(5) unsignedNOPRINULL
namechar(64)NOUNINULL
parent_category_idsmallint(5) unsignedYESNULL
urlchar(128)NONULL

Example

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 |     |
+------------------+-----------------------------------------------+--------------------+-----+

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