SQL查询-将记录添加到所有类别

Question

我有一张包含此数据的表：

ID       ENTRYID      ORDERID     NAME       VALUE
-----------------------------------------------------
1        123          1           Product    AAA
2        123          1           Product    BBB
3        123          2           Type       Consumer
4        123          3           Category   Device
5        123          4           Vendor     CompanyName

ENTRYID是用于标识相关行（条目组）的值。

我需要以下格式的数据：

Product        Name              Value
-------------------------------------------
AAA            Type              Consumer
AAA            Category          Device
AAA            Vendor            CompanyName
BBB            Type              Consumer
BBB            Category          Device
BBB            Vendor            CompanyName

因此，基本上从上述每个产品的条目组中，ORDERID = 1或NAME = Product我需要添加其他详细信息。因此，在这种情况下，产品为AAA和BBB，并为每个产品添加类型，类别和供应商。每个具有相同ENTRYID的条目组可以有一个或多个产品。

我试图做这样的事情：

SELECT 
     CASE WHEN NAME = 'Product' THEN Value END AS PRODUCT,
     …
FROM MYTABLE

它在同一栏中为我提供了产品，但仅列出了两次

PRODUCT 
---------------
AAA
BBB

Answer 1

根据您的示例数据，我认为此查询将满足您的要求。它为给定的Product选择所有的ENTRYID值，然后JOIN将那些ENTRYID的值归为该SELECT P.VALUE AS Product, N.NAME AS Name, N.VALUE AS Value FROM (SELECT ENTRYID, VALUE FROM test WHERE NAME = 'Product') P JOIN (SELECT ENTRYID, NAME, VALUE FROM test WHERE NAME != 'Product') N ON N.ENTRYID = P.ENTRYID 的所有非产品值：

Product     Name        Value
AAA         Type        Consumer
AAA         Category    Device
AAA         Vendor      CompanyName
BBB         Type        Consumer
BBB         Category    Device
BBB         Vendor      CompanyName

输出：

--> DT_null --> Initial request -->
[]
--> DT0

1. Create initial structure:
Folder1/Folder2_copyme/file_to_copy.txt
Folder_move_to_me/

--> DT0 --> Initial request -->
`Folder1/`
`Folder2_copyme/`
`Folder_move_to_me/`
`Folder1/Folder2_copyme/file_to_copy.txt`
--> DT1

2. Copy `Folder2_copyme` to root folder
structure:
Folder1/Folder2_copyme/file_to_copy.txt
Folder2_copyme/file_to_copy.txt
Folder_move_to_me/


--> DT0 --> Request delta
`Folder1/`
`Folder2_copyme/`
`Folder_move_to_me/`
`Folder1/Folder2_copyme/file_to_copy.txt`
`Folder2_copyme/file_to_copy.txt`
--> DT2

3. Move `Folder2_copyme` from root folder to `Folder_move_to_me`
structure:
Folder1/Folder2_copyme/file_to_copy.txt
Folder_move_to_me/Folder2_copyme/file_to_copy.txt

--> DT0 --> Request delta
`Folder1/`
`Folder_move_to_me/`
`Folder1/Folder2_copyme/file_to_copy.txt`
`Folder_move_to_me/Folder2_copyme/`
?? where `Folder_move_to_me/Folder2_copyme/file_to_copy.txt` ???
--> DT3

Demo on dbfiddle