Question

我需要你的帮助我怎样才能将这个sql解释为linq：

SELECT  FK_ClassId, LectureDays
FROM tbl_TimeTables
WHERE (FK_ClassId = 11)
group by fk_classid, lecturedays
having count(distinct Period) < 7

非常感谢任何帮助添

Answer 1

应该是这些方面的东西（按ID分组，计算期间，适用于where子句，项目结果）

var query = from timetable in context.TimeTables
            where timetable.ClassId == classId
            group timetable by new
            {
                timetable.ClassId,
                timetable.Period
            } into groupings
            let counter = groupings
                .Select(p => p.Period)
                .Distinct()
                .Count()
            where counter < 7
            select new
            {
                ClassId = groupings.Key.ClassId,
                Days = from grouping in groupings
                       select grouping.LectureDays
            };

Answer 2

谢谢你把我指向了正确的方向，对不起，我现在还没回复一段时间，被捆绑了。在看了你的解决方案后，我有时间玩它，下面就为我做了这个：

from t in Tbl_TimeTables 
where t.FK_ClassId == 11
        group t by new
        {
            t.FK_ClassId,
            t.LectureDays
        } into groupings
        let counter = groupings
            .Select(p => p.Period)
            .Distinct()
            .Count()
        where counter < 7
        select new
        {
            ClassId = groupings.Key.FK_ClassId,
            Days = (from grouping in groupings
                   select grouping.LectureDays).Distinct()
        }

我只需要通过键将组更改为lecturedays而不是period，这会删除我得到的一系列结果。非常感谢Dan

sql具有不同字段数的语句

2 个答案: