MySQL：列出带有表的数据库

Question

有没有办法在单个命令中列出所有带有表的数据库？

期待：

mysql> SHOW DATABASES, TABLES;

    DB1 table1
        table2
    DB2 table1
        table2
        table3
        table4
        table5
    DB3 table1
        table2

Answer 1

使用存储在 中的信息INFORMATION_SCHEMA：

SELECT table_schema, table_name
FROM INFORMATION_SCHEMA.tables
ORDER BY table_schema, table_name;

table_schema 是数据库名称。

还显示没有任何表的数据库：

SELECT s.schema_name, t.table_name 
FROM INFORMATION_SCHEMA.schemata AS s 
  LEFT JOIN INFORMATION_SCHEMA.tables AS t 
    ON t.table_schema = s.schema_name 
-- optional, to hide system databases and tables
-- WHERE s.schema_name NOT IN ('information_schema', 'mysql', 'performance_schema')
ORDER BY schema_name, table_name ;

文档链接：INFORMATION_SCHEMA.tables， INFORMATION_SCHEMA.schemata