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APIVOTused to rotate the data from one column into multiple columns.
Another, yet similar, approach involves the aggregation in place of the join operation....
from #tempScores ts pivot ( max(ts.classScore) for className in(' + @columnfilter +N') ) ps ' exec sp_executesql @sqlstatement --2 columns of records transformed to rows 列转行 if exists(select 1 from tempdb.sys.tables where upper(name) like upper('%tempScores%')) drop table #te...
The new PIVOT operator lets you rotate rows into columns, optionally performing aggregations along the way. For example, suppose you want to return from the Orders table the count of yearly orders for each employee. You could write a simple GROUP BY query to get the information, but you want...
To easily transpose columns into rows with its names you should use XML. In my blog I was described this solution with example: It doesn't appear to be the XML that does the trick there. It's the dynamic SQL that does it. Why is that any better than just plain old dynamic SQL driv...
T-SQL offers a built-in operator calledPIVOT. Oracle includes the same, but MySQL lacks it. The PIVOT operator converts rows to columns. People pivot on data points like the months of the year or employees. Imagine you create a scheduling report with employees as rows and columns as months...
This is in addition to all rows typically returned by the INNER JOIN. LEFT [ OUTER ] Specifies that all rows from the left table not meeting the join condition are included in the result set, and output columns from the other table are set to NULL in addition to all rows returned by ...
UNPIVOTis similar toPIVOTin reverse, but spreads existing column values into rows. The source set is similar to the result of thePIVOTwith values pertaining to particular entities listed in columns. Because the result set has more rows than the source, aggregations ...
在介绍联接前先引出一个概念--表运算符,我们知道FROM字句是第一个被逻辑处理的字句,其中包含表信息,那么对表进行操作的运算符就是表运算符,其中本节要介绍的JOIN是最重要的,很多时候,工作中可能仅仅使用它就足够,此外还是APPLY、PIVOT、UNPIVOT等操作符,之后会介绍。其中JOIN操作符对两个输入表进行操作,类型包括交叉...