Questions tagged «mariadb»

当我检查MySQL下数据库的大小时，得到以下信息： MariaDB [(none)]> SELECT table_schema "Data Base Name", sum( data_length + index_length ) / 1024 / 1024 "Data Base Size in MB", sum( data_free )/ 1024 / 1024 "Free Space in MB" FROM information_schema.TABLES GROUP BY table_schema; +--------------------+----------------------+------------------+ | Data Base Name | Data Base Size in MB | Free …

8 ubuntu  mysql  mariadb 

我是一个新手，我找不到在任何地方执行此操作的好方法。我有一个数据库表，其中包含一周中不同时间记录的统计信息。报告周从星期四开始。该表包含一个datestamp列（日期），该列存储记录数据的时间。 我需要提取给定一周的数据（报告周从星期四开始）。我写了以下查询： SELECT * FROM `table` WHERE 1 = CASE WHEN WEEKDAY(NOW()) = 0 THEN DATEDIFF(NOW(),`date`) BETWEEN -2 AND 4 WHEN WEEKDAY(NOW()) = 1 THEN DATEDIFF(NOW(),`date`) BETWEEN -1 AND 5 WHEN WEEKDAY(NOW()) = 2 THEN DATEDIFF(NOW(),`date`) BETWEEN -0 AND 6 WHEN WEEKDAY(NOW()) = 3 THEN DATEDIFF(NOW(),`date`) BETWEEN -6 AND 0 …

8 mysql  mariadb