Question

让我尽可能地描述这一点，这是关于SQL Server的。

有一个主表，每个参与者有一条记录，每个参与者有一个子表，最多有5条记录。

我需要能够返回主表中的所有记录以及SELECT查询中同一记录中每个参与者的子表记录。

示例：

Main Table:
   Participant_ID,
   Program
Sub Table:
   Participant_ID,
   Skill_Set_ID,
   Rating

SQL Query results:
    Participant_ID, Program, Skill_Set_ID_1, Rating_1, Skill_Set_ID_2, Rating_2, Skill_Set_ID_3, Rating_3, Skill_Set_ID_4, Rating_4, Skill_Set_ID_5, Rating_5

基本上是行到列的想法。

我怎样才能完成这项工作？我完全失去了

Answer 1

select mt.Participant_ID, mt.Program, 
       st1.Skill_Set_ID as Skill_Set_ID_1, st1.Rating as Rating_1, 
       st2.Skill_Set_ID as Skill_Set_ID_2, st2.Rating as Rating_2, 
       st3.Skill_Set_ID as Skill_Set_ID_3, st3.Rating as Rating_3, 
       st4.Skill_Set_ID as Skill_Set_ID_4, st4.Rating as Rating_4, 
       st5.Skill_Set_ID as Skill_Set_ID_5, st5.Rating as Rating_5, st5.Skill_Text
       st6.Skill_Set_ID as Skill_Set_ID_6, st6.Rating as Rating_6, st6.Skill_Text
       st7.Skill_Set_ID as Skill_Set_ID_7, st5.Rating as Rating_7, st7.Skill_Text
    from main_table mt
        left join sub_table st1
            on mt.Participant_ID = st1.Paticipant_ID
                and st1.Skill_Set_ID = 1
        left join sub_table st2
            on mt.Participant_ID = st2.Paticipant_ID
                and st2.Skill_Set_ID = 2
        left join sub_table st3
            on mt.Participant_ID = st3.Paticipant_ID
                and st3.Skill_Set_ID = 3
        left join sub_table st4
            on mt.Participant_ID = st4.Paticipant_ID
                and st4.Skill_Set_ID = 4
        left join sub_table st5
            on mt.Participant_ID = st5.Paticipant_ID
                and st5.Skill_Set_ID = 5
                and st5.Skill_Text = 'Skill A'
        left join sub_table st6
            on mt.Participant_ID = st6.Paticipant_ID
                and st6.Skill_Set_ID = 5
                and st6.Skill_Text = 'Skill B'
        left join sub_table st7
            on mt.Participant_ID = st7.Paticipant_ID
                and st7.Skill_Set_ID = 5
                and st7.Skill_Text = 'Skill C'

Answer 2

你需要在这里做一个转轴。但是你的案例的问题是你需要转向多个列。我希望这能指出你正确的方向Multiple Column Pivot in T-SQL

Answer 3

SELECT *
FROM Main_Table, Sub_Table
WHERE Main_Table.Participant_ID = Sub_Table.Participant_ID;

SQL Server是否使用标准SQL？

SQL查询需要返回主记录和辅助记录

3 个答案: