Sum子查询Oracle
问题描述:
我正在做一个SQL查询,我试图总结我的子查询的结果,但没有成功。该命令不执行 有人可以帮助我吗?Sum子查询Oracle
我做的查询是:
SELECT cm.course_id,cm.course_name, sum (select max(SCORE) from
ATTEMPT where GRADEBOOK_GRADE_PK1 = GG.PK1 group by 1)
FROM gradebook_main gm
JOIN course_main cm ON cm.pk1 = gm.crsmain_pk1
JOIN gradebook_grade gg ON gm.pk1 = gg.gradebook_main_pk1
JOIN course_users cu ON cu.pk1 = gg.course_users_pk1
JOIN users u ON u.pk1 = cu.users_pk1
WHERE U.user_id = '1616894251'
group by cm.course_id, cm.course_name
谢谢!
答
我已经试过你的子查询中构建的连接表..hopre GROUP BY列是GRADEBOOK_GRADE_PK1
SELECT
cm.course_id
, cm.course_name
, sum (t.max_score
)
FROM gradebook_main gm
JOIN course_main cm ON cm.pk1 = gm.crsmain_pk1
JOIN gradebook_grade gg ON gm.pk1 = gg.gradebook_main_pk1
JOIN course_users cu ON cu.pk1 = gg.course_users_pk1
JOIN users u ON u.pk1 = cu.users_pk1
JOIN (
select GRADEBOOK_GRADE_PK1, max(SCORE) max_score
from ATTEMPT
group by GRADEBOOK_GRADE_PK1
) t on t.GRADEBOOK_GRADE_PK1 = GG.PK1
WHERE U.user_id = '1616894251'
group by cm.course_id, cm.course_name
+0
老兄,我没有话语要谢谢你。 很多很多,谢谢! –
子查询您可以通过1组声明,但你没有在子查询SELECT子句中的列..你所需要的列..用明确的名字 – scaisEdge