如何根据公共条目将数据库 table 行移动到列中

Question

我有以下数据库：

这只是一个更大的数据集的一个子集，该数据集太大而无法输入。

ID	CODE	IDENTIFIERS	COLORS	SHAPES	NUMB
101	24	N	RED	CIRCLE	174
102	32	N	BLUE	SQUARE	155
102	32	N	PURPLE	STAR	223
103	13	Y	RED	SQUARE	143
103	13	Y	GREEN	CIRCLE	123
103	13	Y	BLUE	SQUARE	142

我需要以下结果：

ID	CODE	IDENTIFIERS	COLORS1	COLORS2	COLORS3	SHAPES1	SHAPES2	SHAPES3	NUMB1	NUMB2	NUMB3
101	24	N	RED			CIRCLE			174
102	32	N	BLUE	PURPLE		SQUARE	STAR		155	223
103	13	Y	RED	GREEN	BLUE	SQUARE	CIRCLE	SQUARE	143	123	142

我试过了：

    SELECT ID, 
     CODE, 
     IDENTIFIERS, 
     group_concat(COLORS) AS COLORSS, 
     group_concat(SHAPES) AS SHAPESS, 
     group_concat(NUMB) AS NUMBS 
     FROM ( 
     SELECT a.ID, 
     a.CODE, 
     a.IDENTIFIERS, 
     a.COLORS, 
     a.SHAPES, 
     a.NUMB 
     FROM database AS a 
    ) AS sub 
    GROUP BY ID, CODE, IDENTIFIERS

我得到了：

ID	CODE	IDENTIFIERS	COLORS	SHAPES	NUMB
101	24	N	RED	CIRCLE	174
102	32	N	BLUE,PURPLE	SQUARE,STAR	155,223
103	13	Y	RED,GREEN,BLUE	SQUARE,CIRCLE,SQUARE	143,123,142

这很接近，但不是我想要的。任何帮助将不胜感激。

Answer 1

首先，您需要一种方法来确定要将行放入哪些列。为此，您可以使用 ROW_NUMBER()

然后您可以使用 MAX(CASE) 的组合来旋转数据。

WITH
  sorted AS
(
  SELECT
    *,
    ROW_NUMBER() OVER (PARTITION BY id, code, identifiers)   AS row_id
  FROM
    yourTable
)
SELECT
  id,
  code,
  identifiers,

  MAX(CASE WHEN row_id = 1 THEN colors END)   AS colors_1,
  MAX(CASE WHEN row_id = 1 THEN shapes END)   AS shapes_1,
  MAX(CASE WHEN row_id = 1 THEN numb   END)   AS numb_1,

  MAX(CASE WHEN row_id = 2 THEN colors END)   AS colors_2,
  MAX(CASE WHEN row_id = 2 THEN shapes END)   AS shapes_2,
  MAX(CASE WHEN row_id = 2 THEN numb   END)   AS numb_2,

  MAX(CASE WHEN row_id = 3 THEN colors END)   AS colors_3,
  MAX(CASE WHEN row_id = 3 THEN shapes END)   AS shapes_3,
  MAX(CASE WHEN row_id = 3 THEN numb   END)   AS numb_3
FROM
  sorted
GROUP BY
  id,
  code,
  identifiers

如何根据公共条目将数据库 table 行移动到列中

How to move database table rows into columns based on a common entry

database

sqlite

organization