查jx_score表的平均值,以哪次考試(testid)和科目分組(courseid)
select
testid,
courseid,
round(avg(`jx_score`.`score`),2) AS `average`
from `jx_score`
group by `jx_score`.`testid`,`jx_score`.`courseid`
查jx_score表的平均值,以哪次考試(testid)和科目分組(courseid)
select
testid,
courseid,
round(avg(`jx_score`.`score`),2) AS `average`
from `jx_score`
group by `jx_score`.`testid`,`jx_score`.`courseid`
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