This is a read-only copy of the MariaDB Knowledgebase generated on 2024-11-14. For the latest, interactive version please visit https://mariadb.com/kb/.

Information Schema COLLATIONS Table

The Information Schema COLLATIONS table contains a list of supported collations.

It contains the following columns:

ColumnDescription
COLLATION_NAMEName of the collation.
CHARACTER_SET_NAMEAssociated character set.
IDCollation id.
IS_DEFAULTWhether the collation is the character set's default.
IS_COMPILEDWhether the collation is compiled into the server.
SORTLENSort length, used for determining the memory used to sort strings in this collation.

The SHOW COLLATION statement returns the same results and both can be reduced in a similar way.

For example, in MariaDB 10.6, the following two statements return the same results:

SHOW COLLATION WHERE Charset LIKE 'utf8mb3';

and

SELECT * FROM information_schema.COLLATIONS 
WHERE CHARACTER_SET_NAME LIKE 'utf8mb3';

In MariaDB 10.5 and before, utf8 should be specified instead of utf8mb3.

NO PAD collations

NO PAD collations regard trailing spaces as normal characters. You can get a list of all NO PAD collations as follows:

SELECT collation_name FROM information_schema.COLLATIONS
WHERE collation_name LIKE "%nopad%";  
+------------------------------+
| collation_name               |
+------------------------------+
| big5_chinese_nopad_ci        |
| big5_nopad_bin               |
...

Example

SELECT * FROM information_schema.COLLATIONS;
+------------------------------+--------------------+------+------------+-------------+---------+
| COLLATION_NAME               | CHARACTER_SET_NAME | ID   | IS_DEFAULT | IS_COMPILED | SORTLEN |
+------------------------------+--------------------+------+------------+-------------+---------+
| big5_chinese_ci              | big5               |    1 | Yes        | Yes         |       1 |
| big5_bin                     | big5               |   84 |            | Yes         |       1 |
| big5_chinese_nopad_ci        | big5               | 1025 |            | Yes         |       1 |
| big5_nopad_bin               | big5               | 1108 |            | Yes         |       1 |
| dec8_swedish_ci              | dec8               |    3 | Yes        | Yes         |       1 |
| dec8_bin                     | dec8               |   69 |            | Yes         |       1 |
| dec8_swedish_nopad_ci        | dec8               | 1027 |            | Yes         |       1 |
| dec8_nopad_bin               | dec8               | 1093 |            | Yes         |       1 |
| cp850_general_ci             | cp850              |    4 | Yes        | Yes         |       1 |
| cp850_bin                    | cp850              |   80 |            | Yes         |       1 |
...

See Also

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