SQL查询以删除不同行中的重复列值

Question

我正在使用MS SQL，我有如下所述的表“Table1”，“Table2”，“Table3”（可能看起来像一团糟，我不知道如何在这里更好地制作表格）。 我想要提到底部的“预期的OutPut”。

希望SQL脚本执行此操作。

表1

FamilyID FamilyName
1        One
2        Two
3        Three

表2

FamilyID UserID UserName
1        1      Name1
1        2      Name2
1        3      Name3
2        4      Name4
2        5      Name5
2        6      Name6
2        7      Name7
2        8      Name8
3        9      Name9
3        10     Name10

表3

FamilyID RoomID RoomType
1        1      RoomType1
1        2      RoomType2
2        1      RoomType1
2        2      RoomType2
2        3      RoomType3
2        2      RoomType2

预期OutPut

FamilyID UserName RoomType
1        Name1    RoomType1
         Name2    RoomType2
         Name3
2        Name4    RoomType1
         Name5    RoomType2
         Name6    RoomType3
         Name7
         Name8
3        Name9    RoomType2
         Name10

修改 我试过how to show column value only one time if it is repeated and blank until different value comes in sql ，但输出并不像我预期的那样。如下所示，对于FamilyID = 1

，它有重复 来自how to show column value only one time if it is repeated and blank until different value comes in sql

的

结果

FamilyID UserName RoomType
1        Name1    RoomType1
         Name2    RoomType1
         Name3    RoomType1
         Name1    RoomType2
         Name2    RoomType2
         Name3    RoomType2

预期OutPut

FamilyID UserName RoomType
1        Name1    RoomType1
         Name2    RoomType2
         Name3

Answer 1

您可以使用这样的解决方案：

    SELECT T1.FamilyID,T2.UserName,T3RoomType FROM Table1 T1 
        JOIN Table2 T2 ON T1.FamilyID =T2.FamilyID 
    LEFT JOIN Table3 T3 ON T2.UserID  =T3.RoomID 
    GROUP BY T2.UserID