mysql中的schema 等价于database，相当于一个数据库

MySQL 中 Schema 等价于 数据库。

mysql> SELECT
    ->   SCHEMA_NAME,
    ->   DEFAULT_CHARACTER_SET_NAME,
    ->   DEFAULT_COLLATION_NAME
    -> FROM
    ->   INFORMATION_SCHEMA.SCHEMATA;
+--------------------+----------------------------+------------------------+
| SCHEMA_NAME        | DEFAULT_CHARACTER_SET_NAME | DEFAULT_COLLATION_NAME |
+--------------------+----------------------------+------------------------+
| information_schema | utf8                       | utf8_general_ci        |
| mysql              | <a href="https://www.baidu.com/s?wd=latin1&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1d-uhfvnWPhmWDduHN9ujK-0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3EP1DsP1b1nH61njTdnWRzP1md" target="_blank" class="baidu-highlight">latin1</a>                     | <a href="https://www.baidu.com/s?wd=latin1&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1d-uhfvnWPhmWDduHN9ujK-0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3EP1DsP1b1nH61njTdnWRzP1md" target="_blank" class="baidu-highlight">latin1</a>_swedish_ci      |
| sqldoc             | utf8                       | utf8_general_ci        |
| test               | <a href="https://www.baidu.com/s?wd=latin1&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1d-uhfvnWPhmWDduHN9ujK-0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3EP1DsP1b1nH61njTdnWRzP1md" target="_blank" class="baidu-highlight">latin1</a>                     | latin1_swedish_ci      |
| test2              | latin1                     | latin1_swedish_ci      |
+--------------------+----------------------------+------------------------+
5 rows in set (0.00 sec)