SCHEMATA
The SCHEMATA table provides information about databases. The table data is equivalent to the result of the SHOW DATABASES statement.
sql
USE INFORMATION_SCHEMA;
DESC SCHEMATA;USE INFORMATION_SCHEMA;
DESC SCHEMATA;The output is as follows:
sql
+----------------------------+--------+------+------+---------+---------------+
| Column | Type | Key | Null | Default | Semantic Type |
+----------------------------+--------+------+------+---------+---------------+
| catalog_name | String | | NO | | FIELD |
| schema_name | String | | NO | | FIELD |
| default_character_set_name | String | | NO | | FIELD |
| default_collation_name | String | | NO | | FIELD |
| sql_path | String | | YES | | FIELD |
+----------------------------+--------+------+------+---------+---------------+
5 rows in set (0.00 sec)+----------------------------+--------+------+------+---------+---------------+
| Column | Type | Key | Null | Default | Semantic Type |
+----------------------------+--------+------+------+---------+---------------+
| catalog_name | String | | NO | | FIELD |
| schema_name | String | | NO | | FIELD |
| default_character_set_name | String | | NO | | FIELD |
| default_collation_name | String | | NO | | FIELD |
| sql_path | String | | YES | | FIELD |
+----------------------------+--------+------+------+---------+---------------+
5 rows in set (0.00 sec)sql
SELECT * FROM SCHEMATA;SELECT * FROM SCHEMATA;sql
+--------------+--------------------+----------------------------+------------------------+----------+
| catalog_name | schema_name | default_character_set_name | default_collation_name | sql_path |
+--------------+--------------------+----------------------------+------------------------+----------+
| greptime | greptime_private | utf8 | utf8_bin | NULL |
| greptime | information_schema | utf8 | utf8_bin | NULL |
| greptime | public | utf8 | utf8_bin | NULL |
+--------------+--------------------+----------------------------+------------------------+----------+
3 rows in set (0.01 sec)+--------------+--------------------+----------------------------+------------------------+----------+
| catalog_name | schema_name | default_character_set_name | default_collation_name | sql_path |
+--------------+--------------------+----------------------------+------------------------+----------+
| greptime | greptime_private | utf8 | utf8_bin | NULL |
| greptime | information_schema | utf8 | utf8_bin | NULL |
| greptime | public | utf8 | utf8_bin | NULL |
+--------------+--------------------+----------------------------+------------------------+----------+
3 rows in set (0.01 sec)Fields in the SCHEMATA table are described as follows:
catalog_name: The catalog to which the database belongs.schema_name: The name of the database.default_character_set_name: The default character set of the database.default_collation_name: The default collation of the database.sql_path: The value of this item is alwaysNULL.