T-SQL |动态转置
我有下面的场景T-SQL |动态转置,sql,sql-server,tsql,sql-server-2012,Sql,Sql Server,Tsql,Sql Server 2012,我有下面的场景 CREATE TABLE #Temp1 (ID INT , Summary varchar(50)) CREATE TABLE #Temp2 (ID INT , D_ID INT, Detail1 varchar(50), Detail2 varchar(50)) INSERT INTO #Temp1 (ID,Summary) SELECT 1,'First' UNION ALL SELECT 2,'Second' UNION ALL SELECT 3,'Third' UN
CREATE TABLE #Temp1 (ID INT , Summary varchar(50))
CREATE TABLE #Temp2 (ID INT , D_ID INT, Detail1 varchar(50), Detail2 varchar(50))
INSERT INTO #Temp1 (ID,Summary)
SELECT 1,'First'
UNION ALL
SELECT 2,'Second'
UNION ALL
SELECT 3,'Third'
UNION ALL
SELECT 4,'Four'
INSERT INTO #Temp2 (ID, D_ID, Detail1,Detail2)
SELECT 1,1,'One','_1_'
UNION ALL
SELECT 2,2,'Two','_2_'
UNION ALL
SELECT 2,3,NULL,'_3_'
UNION ALL
SELECT 3,4,'Three',NULL
UNION ALL
SELECT 3,5,NULL,NULL
UNION ALL
SELECT 3,6,'Three_2','_32_'
DROP TABLE #Temp1
DROP TABLE #Temp2
我期待以下结果
S_ID, S_Summary, D_Detail1_1, D_Detail1_2, D_Detail2_1, D_Detail2_2, D_Detail3_1, D_Detail3_2...)
1, First, One, _1_ NULL NULL NULL NULL...
2, Second, Two, _2_ NULL _3_ NULL NULL...
3, Third, Three, NULL NULL NULL Three_2 _32_...
4, Four, NULL, NULL NULL NULL NULL NULL...
汇总表和明细表之间可能存在一对多关系,并且明细记录的数量可能会有所不同(动态)
我不知道如何动态地进行旋转,并且仍然获得期望的结果。如果我没有弄错的话,PIVOT需要定义的行集将其转换为列。任何帮助都将不胜感激。这是使用
动态交叉表来完成的。你可以在这里阅读:
我相信这可以通过左连接来完成。我的错误…错误的期望输出..更新:)顺序是什么?很好。添加了D_ID(实表中的标识)。我们可以按ID订购吗?这太棒了!也感谢您发布文章的链接。当我看到有人提出如此“复杂”的问题时,我有时会感到惊讶……真是太神奇了。谢谢没问题<代码>交叉表
已经存在一段时间了。我相信它也被称为条件聚合。
DECLARE @sql1 VARCHAR(2000) = ''
DECLARE @sql2 VARCHAR(2000) = ''
DECLARE @sql3 VARCHAR(2000) = ''
SELECT @sql1 =
'SELECT
t.ID AS S_ID
, t.Summary AS S_Summary
'
SELECT @sql2 = @sql2 +
' , MAX(CASE WHEN RN = ' + CONVERT(VARCHAR(10), RN) + ' THEN Detail1 END) AS D_Detail' + CONVERT(VARCHAR(10), RN) + '_1' + CHAR(10) +
' , MAX(CASE WHEN RN = ' + CONVERT(VARCHAR(10), RN) + ' THEN Detail2 END) AS D_Detail' + CONVERT(VARCHAR(10), RN) + '_2' + CHAR(10)
FROM(
SELECT DISTINCT ROW_NUMBER() OVER(PARTITION BY ID ORDER BY D_ID) AS RN FROM #Temp2
)t
ORDER BY RN
SELECT @sql3 =
'FROM (
SELECT
t1.ID,
t1.Summary,
t2.D_ID,
t2.Detail1,
t2.Detail2,
RN = ROW_NUMBER() OVER(PARTITION BY t1.ID ORDER BY D_ID)
FROM #Temp1 t1
LEFT JOIN #Temp2 t2
ON t2.ID = t1.ID
) t
GROUP BY t.ID, t.Summary
ORDER BY t.ID'