如何解决将文本行转换为SQL Server 2014中的列
我正在尝试捕获特定组的行,然后将其转换为命名脚本标题的列。
这是数据示例:
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
如果有人可以帮助我编写代码,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!
解决方法
您可以使用包含ROW_NUMBER()
函数的Dynamic Pivot,并按formulas
列对instructions
分组的值进行排序,以便为该列名加上该分析函数的迭代编号:
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,'');
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;
如果您安装的数据库版本为 2017 + ,则需要使用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
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