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我有3个不同的查询显示相同的数据,但不同的日期间隔。我不确定将查询合并到一起显示所有数据的最佳方式。我不擅长于连接或嵌套查询,所以我不确定这样做的最佳方式。将3个查询合并为一个,使用联接还是嵌套查询?
基本上我想要4列:准,30天,60天和90天。
查询1:
SELECT cwd_user.display_name AS 'Associate', sum(worklog.timeworked/3600) AS '30 Days'
FROM worklog, cwd_user,cwd_membership
WHERE worklog.AUTHOR = cwd_user.user_name
and cwd_user.directory_id = cwd_membership.directory_id
and cwd_user.lower_user_name = cwd_membership.lower_child_name
and cwd_membership.membership_type = 'GROUP_USER'
and cwd_membership.lower_parent_name = 'atl_servicedesk_it_agents'
and worklog.STARTDATE BETWEEN NOW() AND DATE_ADD(NOW(), INTERVAL 30 DAY)
GROUP BY cwd_user. display_name
ORDER BY cwd_user.last_name;
查询2:
SELECT cwd_user.display_name AS 'Associate', sum(worklog.timeworked/3600) AS '60 Days'
FROM worklog, cwd_user,cwd_membership
WHERE worklog.AUTHOR = cwd_user.user_name
and cwd_user.directory_id = cwd_membership.directory_id
and cwd_user.lower_user_name = cwd_membership.lower_child_name
and cwd_membership.membership_type = 'GROUP_USER'
and cwd_membership.lower_parent_name = 'atl_servicedesk_it_agents'
and worklog.STARTDATE BETWEEN NOW() AND DATE_ADD(NOW(), INTERVAL 60 DAY)
GROUP BY cwd_user. display_name
ORDER BY cwd_user.last_name;
查询3:
SELECT cwd_user.display_name AS 'Associate', sum(worklog.timeworked/3600) AS '90 Days'
FROM worklog, cwd_user,cwd_membership
WHERE worklog.AUTHOR = cwd_user.user_name
and cwd_user.directory_id = cwd_membership.directory_id
and cwd_user.lower_user_name = cwd_membership.lower_child_name
and cwd_membership.membership_type = 'GROUP_USER'
and cwd_membership.lower_parent_name = 'atl_servicedesk_it_agents'
and worklog.STARTDATE BETWEEN NOW() AND DATE_ADD(NOW(), INTERVAL 90 DAY)
GROUP BY cwd_user. display_name
ORDER BY cwd_user.last_name;
请参阅http://meta.stackoverflow.com/questions/333952/why-should-i-provide-an-mcve-for-what-seems-to-me-to-be-a-very-simple-sql-查询 – Strawberry