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      1. 分解表以按列進(jìn)行透視(SQL、PYSPARK)

        Break down a table to pivot in columns (SQL,PYSPARK)(分解表以按列進(jìn)行透視(SQL、PYSPARK))
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                  本文介紹了分解表以按列進(jìn)行透視(SQL、PYSPARK)的處理方法,對(duì)大家解決問(wèn)題具有一定的參考價(jià)值,需要的朋友們下面隨著小編來(lái)一起學(xué)習(xí)吧!

                  問(wèn)題描述

                  我正在使用 AWS Glue 中的 python3.6 環(huán)境在 pyspark 中工作.我有這張桌子:

                  I'm working in an environment pyspark with python3.6 in AWS Glue. I have this table :

                  +----+-----+-----+-----+
                  |year|month|total| loop|
                  +----+-----+-----+-----+
                  |2012|    1|   20|loop1|
                  |2012|    2|   30|loop1|
                  |2012|    1|   10|loop2|
                  |2012|    2|    5|loop2|
                  |2012|    1|   50|loop3|
                  |2012|    2|   60|loop3|
                  +----+-----+-----+-----+
                  

                  我需要得到如下輸出:

                  year    month   total_loop1 total_loop2 total_loop3
                  2012    1         20           10           50
                  2012    2         30           5            60
                  

                  我越接近 SQL 代碼:

                  The closer I have gotten is with the SQL code:

                  select a.year,a.month, a.total,b.total from test a 
                  left join test b
                  on a.loop <> b.loop 
                  and a.year = b.year and a.month=b.month
                  

                  輸出仍然到目前為止:

                  +----+-----+-----+-----+
                  |year|month|total|total|
                  +----+-----+-----+-----+
                  |2012|    1|   20|   10|
                  |2012|    1|   20|   50|
                  |2012|    1|   10|   20|
                  |2012|    1|   10|   50|
                  |2012|    1|   50|   20|
                  |2012|    1|   50|   10|
                  |2012|    2|   30|    5|
                  |2012|    2|   30|   60|
                  |2012|    2|    5|   30|
                  |2012|    2|    5|   60|
                  |2012|    2|   60|   30|
                  |2012|    2|   60|    5|
                  +----+-----+-----+-----+
                  

                  我該怎么做?非常感謝

                  推薦答案

                  表腳本和示例數(shù)據(jù)

                  CREATE TABLE [TableName](
                      [year] [nvarchar](50) NULL,
                      [month] [int] NULL,
                      [total] [int] NULL,
                      [loop] [nvarchar](50) NULL
                  ) 
                  
                  INSERT [TableName] ([year], [month], [total], [loop]) VALUES (N'2012', 1, 20, N'loop1')
                  INSERT [TableName] ([year], [month], [total], [loop]) VALUES (N'2012', 2, 30, N'loop1')
                  INSERT [TableName] ([year], [month], [total], [loop]) VALUES (N'2012', 1, 10, N'loop2')
                  INSERT [TableName] ([year], [month], [total], [loop]) VALUES (N'2012', 2, 5, N'loop2')
                  INSERT [TableName] ([year], [month], [total], [loop]) VALUES (N'2012', 1, 50, N'loop3')
                  INSERT [TableName] ([year], [month], [total], [loop]) VALUES (N'2012', 2, 60, N'loop3')
                  

                  使用樞軸功能...

                  SELECT * 
                  FROM   TableName
                         PIVOT(Max([total]) 
                              FOR [loop] IN ([loop1], [loop2], [loop3]) ) pvt
                  

                  在線演示:http://www.sqlfiddle.com/#!18/164a4/1/0

                  如果您正在尋找動(dòng)態(tài)解決方案,那么試試這個(gè)...(動(dòng)態(tài)樞軸)

                  If you are looking for a dynamic solution, then try this... (Dynamic Pivot)

                  DECLARE @cols AS NVARCHAR(max) = Stuff((SELECT DISTINCT ',' + Quotename([loop])
                           FROM   TableName
                           FOR xml path(''), type).value('.', 'NVARCHAR(MAX)'), 1, 1, ''); 
                  
                  DECLARE @query AS NVARCHAR(max) =  'SELECT * 
                                                      FROM   TableName
                                                             PIVOT(Max([total]) 
                                                                  FOR [loop] IN ('+ @cols +') ) pvt';
                  
                  EXECUTE(@query) 
                  

                  在線演示:http://www.sqlfiddle.com/#!18/164a4/3/0

                  輸出

                  +------+-------+-------+-------+-------+
                  | year | month | loop1 | loop2 | loop3 |
                  +------+-------+-------+-------+-------+
                  | 2012 |     1 |    20 |    10 |    50 |
                  | 2012 |     2 |    30 |     5 |    60 |
                  +------+-------+-------+-------+-------+
                  

                  這篇關(guān)于分解表以按列進(jìn)行透視(SQL、PYSPARK)的文章就介紹到這了,希望我們推薦的答案對(duì)大家有所幫助,也希望大家多多支持html5模板網(wǎng)!

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