SQL Server

Question

我有一张桌子DataDefinitions。我写了一个查询，以下列格式从这个表中获取数据：

但我想将Name列中的公用名部分与枢轴结果数据分开，以获得以下格式的记录：

请帮助我在SQL Server存储过程中如何执行此操作。

我获得第一张表的查询是

SELECT
     d.Name
   , r.latestValueDec AS value
FROM IDReadingLatestValues r
JOIN DataDefinitions d ON r.dataDefinitionId = d.dataDefinitionId

Answer 1

丑陋，但工作......

SELECT
     Name = SUBSTRING(d.Name, 1, PATINDEX('%Phase%', d.Name)
   , [Phase A] = SUM(CASE WHEN d.Name LIKE '%Phase A' THEN r.latestValueDec END)
   , [Phase B] = SUM(CASE WHEN d.Name LIKE '%Phase B' THEN r.latestValueDec END)
   , [Phase C] = SUM(CASE WHEN d.Name LIKE '%Phase C' THEN r.latestValueDec END)
FROM dbo.IDReadingLatestValues r
JOIN dbo.DataDefinitions d ON r.dataDefinitionId = d.dataDefinitionId
GROUP BY SUBSTRING(d.Name, 1, PATINDEX('%Phase%', d.Name)

PS。请规范化您的数据......

Answer 2

如果它总是最多三个阶段，你可以像这样使用条件聚合：

SELECT replace(replace(replace(t.name,'Phase A',''),'Phase B',''),'Phace C','') as name,
       max(CASE WHEN s.latestValueDesc like '%Phase A' then s.latestValueDesc end) as Phase_A,
       max(CASE WHEN s.latestValueDesc like '%Phase B' then s.latestValueDesc end) as Phase_B,
       max(CASE WHEN s.latestValueDesc like '%Phase C' then s.latestValueDesc end) as Phase_C
FROM IDReadingLatestValues s
JOIN DataDefinitions t
 ON s.dataDefinitionId = t.dataDefinitionId
GROUP BY replace(replace(replace(t.name,'Phase A',''),'Phase B',''),'Phace C','')

我确信有一种更漂亮的方法可以做到这一点，但它应该按照您的预期运作。