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information-schema-schemata.md

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SCHEMATA
了解 information_schema 表 `SCHEMATA`。
/docs-cn/dev/information-schema/information-schema-schemata/

SCHEMATA

SCHEMATA 表提供了关于数据库的信息。表中的数据与 SHOW DATABASES 语句的执行结果等价。

{{< copyable "sql" >}}

USE information_schema;
desc SCHEMATA;
+----------------------------+--------------+------+------+---------+-------+
| Field                      | Type         | Null | Key  | Default | Extra |
+----------------------------+--------------+------+------+---------+-------+
| CATALOG_NAME               | varchar(512) | YES  |      | NULL    |       |
| SCHEMA_NAME                | varchar(64)  | YES  |      | NULL    |       |
| DEFAULT_CHARACTER_SET_NAME | varchar(64)  | YES  |      | NULL    |       |
| DEFAULT_COLLATION_NAME     | varchar(32)  | YES  |      | NULL    |       |
| SQL_PATH                   | varchar(512) | YES  |      | NULL    |       |
+----------------------------+--------------+------+------+---------+-------+
5 rows in set (0.00 sec)

{{< copyable "sql" >}}

SELECT * FROM SCHEMATA;
+--------------+--------------------+----------------------------+------------------------+----------+
| CATALOG_NAME | SCHEMA_NAME        | DEFAULT_CHARACTER_SET_NAME | DEFAULT_COLLATION_NAME | SQL_PATH |
+--------------+--------------------+----------------------------+------------------------+----------+
| def          | INFORMATION_SCHEMA | utf8mb4                    | utf8mb4_bin            | NULL     |
| def          | METRICS_SCHEMA     | utf8mb4                    | utf8mb4_bin            | NULL     |
| def          | mysql              | utf8mb4                    | utf8mb4_bin            | NULL     |
| def          | PERFORMANCE_SCHEMA | utf8mb4                    | utf8mb4_bin            | NULL     |
| def          | test               | utf8mb4                    | utf8mb4_bin            | NULL     |
+--------------+--------------------+----------------------------+------------------------+----------+
5 rows in set (0.00 sec)

SCHEMATA 表各列字段含义如下：

  • CATALOG_NAME：数据库归属的目录名，该列值永远为 def。
  • SCHEMA_NAME：数据库的名字。
  • DEFAULT_CHARACTER_SET_NAME：数据库的默认字符集。
  • DEFAULT_COLLATION_NAME：数据库的默认 collation。
  • SQL_PATH：该项值永远为 NULL。