Mysql 组内的最小日期
我正在尝试在一个查询中确定以下内容是否可行 我们有一个从表A和表B获取信息的查询Mysql 组内的最小日期,mysql,sql,Mysql,Sql,我正在尝试在一个查询中确定以下内容是否可行 我们有一个从表A和表B获取信息的查询 SELECT a.wj_job ,a.wj_sched ,a.wj_lump ,SUM(b.wj_billed) AS wj_billed ,SUM(b.wj_received) AS wj_recd ,a.wj_lbdate ,a.wj_fecom1 FROM ag_fsch a JOIN ag_fschd b ON a.wj_j
SELECT
a.wj_job
,a.wj_sched
,a.wj_lump
,SUM(b.wj_billed) AS wj_billed
,SUM(b.wj_received) AS wj_recd
,a.wj_lbdate
,a.wj_fecom1
FROM ag_fsch a
JOIN ag_fschd b ON a.wj_job = b.wj_jbnum AND a.wj_sched = b.wj_sched
WHERE
a.wj_job LIKE "4733.%"
GROUP BY
a.wj_job
,a.wj_sched
ORDER BY
a.wj_job
,a.wj_sched
作为上述查询的一部分,我想从表b中提取最后一个未付账单日期。同样的事情也可以通过下面的查询来实现,但只适用于原始查询中的特定结果
SELECT
MIN(wj_bdate)
FROM ag_fschd
WHERE
wj_jbnum = 4733.00
AND wj_sched = 6
AND wj_billed <> 0
AND wj_received = 0
我认为可以使用条件聚合。我不确定,因为group by中有两个键,而不仅仅是工号。但是,这可能是您想要的输出:
SELECT a.wj_job, a.wj_sched, a.wj_lump, SUM(b.wj_billed) AS wj_billed,
SUM(b.wj_received) AS wj_recd, a.wj_lbdate, a.wj_fecom1,
MIN(CASE WHEN b.wj_sched = 6 AND b.wj_billed <> 0 AND b.wj_received = 0
THEN wj_bdate
END)
FROM ag_fsch a JOIN
ag_fschd b
ON a.wj_jbnum = b.wj_jbnum AND a.wj_sched = b.wj_sched
WHERE a.wj_jbnum LIKE '4733.%'
GROUP BY a.wj_jbnum, a.wj_sched
ORDER BY a.wj_jbnum, a.wj_sched;
使用子查询获取每个查询的最小日期:-
SELECT a.wj_job,
a.wj_sched,
a.wj_lump,
SUM(b.wj_billed) AS wj_billed,
SUM(b.wj_received) AS wj_recd,
a.wj_lbdate,
a.wj_fecom1 ,
sub0.wj_bdate
FROM ag_fsch a
JOIN ag_fschd b ON a.wj_jbnum = b.wj_jbnum AND a.wj_sched = b.wj_sched
LEFT OUTER JOIN
(
SELECT wj_jbnum,
wj_sched,
MIN(wj_bdate)
FROM ag_fschd
WHERE wj_billed <> 0
AND wj_received = 0
GROUP BY wj_jbnum,
wj_sched
) sub0
ON sub0.wj_jbnum = a.wj_jbnum AND sub0.wj_sched = a.wj_sched
WHERE a.wj_jbnum LIKE "4733.%"
GROUP BY a.wj_jbnum, a.wj_sched
ORDER BY a.wj_jbnum, a.wj_sched
注意,正如Jarlh在评论中指出的,GROUPBY子句有点奇怪,因为它没有所有的非聚合字段。我没有试图在这里解决这个问题。第二个查询min将只提供1条记录。是否要为第一个查询的所有行显示相同的记录?常规GROUP BY规则说明:如果指定GROUP BY子句,则SELECT列表中的每个列引用必须标识分组列或是集合函数的参数。较新的MySQL版本遵循这一规则,较旧的版本则不然;您的查询看起来不正确。表的唯一键是什么?表A在wj_job和wj_sched上有一个唯一的索引。表B有一个关于wj_作业、wj_计划、wj_bdate和wj_crno的唯一索引。不幸的是,这些是我们需要报告的第三方表on@Utsav我们希望为工作的每个日程安排返回不同的思维方式。在本例中,作业有来自表A 7的7个结果。每个计划可以在表B中有多个具有唯一日期的条目。从案例中删除B.wj_计划的一部分似乎会产生我们正在寻找的结果。