本文介绍了在SQL Server 2014中将(文本)行转换为列的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在尝试捕获特定组的行,然后将它们转换为命名脚本标头的列。
这是一个数据示例:
FORMULAS | INSTRUCTIONS
----------+----------------------------------------------------
AF100120 | **ACETALDEHYDE WARNING - USE APPROPRIATE CAUTION**
AF100120 | ADD REMAINING ITEMS
AF100120 | DISSOLVE ITEMS 1-2 IN 3
AF100120 | IF HEAT USED, COOL TO ROOM TEMPERATURE
AF100120 | MIX UNTIL HOMOGENEOUS
AF100120 | MIXING TIMES VARY WITH BATCH SIZE
AF100997 | 1) DISSOLVE THYMOL CRYSTALS IN ETHYL ALCOHOL. MIX WELL.
AF100997 | 2) ADD REMAINING ITEMS AND MIX UNTIL UNIFORM.
AF100997 | 3) FILTER IF NOT CLEAR
此脚本的所需输出为:
FORMULAS | INSTRUCTION #1 |INSTRUCTION #2 | INSTRUCTION #3 |INSTRUCTION #4 |INSTRUCTION #5|INSTRUCTION #6
AF100120 |**ACETALDEHYDE..| ADD REMAINING.| DISSOLVE ITEM. |IF HEAT USED.. |MIX UNTIL H |MIXING TIM...
AF100997 |1) DISSOLVE THYM| 2) ADD REMAINI| FILTER IF NOT | NULL |NULL |NULL
如果有人能帮我编写代码,我将不胜感激:
SELECT *
FROM
(SELECT
A.FormulaId AS FORMULAS,
CAST(B.Instruction AS NVARCHAR(100)) AS [INSTRUCTIONS]
FROM
Formulas AS A
LEFT JOIN
FormulaProcedures AS B ON A.FormulaId = B.FormulaId
WHERE
B.ProcedureType = 3
AND PhaseType = 2
AND YEAR(A.VersionDate) >= '2018'
AND A.PrimaryVersion = 1
AND A.FormulaId IN('AF100120', 'AF100997')
GROUP BY
A.FormulaId, CAST(B.Instruction AS NVARCHAR(100))
) AS SourceTable
PIVOT
(MAX([INSTRUCTIONS])
FOR [INSTRUCTIONS] IN ([INSTRUCTION #1], [INSTRUCTION #2],
[INSTRUCTION #3], [INSTRUCTION #4],
[INSTRUCTION #5], [INSTRUCTION #6])) AS PivotTable;
谢谢!
推荐答案
可以使用动态透视包含ROW_NUMBER()
函数,其值按formulas
按instructions
列分组,以便在迭代分析函数时对列名进行编号:
DECLARE @cols AS NVARCHAR(MAX), @query AS NVARCHAR(MAX)
SELECT @cols =
STUFF((SELECT DISTINCT ',' + QUOTENAME(CONCAT('formulas',[rn])) AS formulas
FROM
(
SELECT f.*,
ROW_NUMBER() OVER
(PARTITION BY [formulas] ORDER BY [instructions]) AS rn
FROM [Formulas_Tab] f
) ff
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'');
SET @query =
N'SELECT *
FROM
(
SELECT f.*,
CONCAT(''formulas'',
ROW_NUMBER() OVER
(PARTITION BY [formulas] ORDER BY [instructions])) AS rn
FROM [Formulas_Tab] f
) ff
PIVOT
(
MAX([instructions]) FOR [rn] IN (' + @cols + N')
) p '
EXEC sp_executesql @query;
Demo
如果您安装的数据库的版本是2017+,那么您将使用STRING_AGG()
函数来确定@cols
变量为
SELECT @cols =
SELECT STRING_AGG(QUOTENAME(CONCAT('formulas', [ rn ])), ',') AS formulas
FROM
(
SELECT DISTINCT ROW_NUMBER() OVER
( PARTITION BY [ formulas ] ORDER BY [ instructions ]) AS rn
FROM [ Formulas_Tab ] f
) ff
这篇关于在SQL Server 2014中将(文本)行转换为列的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持编程学习网!
本站部分内容来源互联网,如果有图片或者内容侵犯您的权益请联系我们删除!