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P粉4818158972023-08-30 16:00:12
这是一个“unpivot”的示例:
(SELECT User AS Users, 'Select' AS Privileges, 1 AS PrivOrder, MAX(CASE db WHEN 'performance_schema' THEN Select_priv='Y' END) AS `performance_schema`, MAX(CASE db WHEN 'sys' THEN Select_priv='Y' END) AS `sys` FROM db GROUP BY User) UNION (SELECT User, 'Insert', 2, MAX(CASE db WHEN 'performance_schema' THEN Insert_priv='Y' END), MAX(CASE db WHEN 'sys' THEN Insert_priv='Y' END) FROM db GROUP BY User) UNION (SELECT User, 'Update', 3, MAX(CASE db WHEN 'performance_schema' THEN Update_priv='Y' END), MAX(CASE db WHEN 'sys' THEN Update_priv='Y' END) FROM db GROUP BY User) UNION (SELECT User, 'Delete', 4, MAX(CASE db WHEN 'performance_schema' THEN Delete_priv='Y' END), MAX(CASE db WHEN 'sys' THEN Delete_priv='Y' END) FROM db GROUP BY User) UNION (SELECT User, 'Create', 5, MAX(CASE db WHEN 'performance_schema' THEN Create_priv='Y' END), MAX(CASE db WHEN 'sys' THEN Create_priv='Y' END) FROM db GROUP BY User) ... ORDER BY Users, PrivOrder;
抱歉,无法自动根据查询找到的数据为每个模式定义列的透视或反透视查询。在查询开始读取数据之前,必须在查询中设置列。