SQL 列转行

1. 创建临时表

CREATE TABLE #TmpTable

(

RYear INT, --年份

RMonth INT, --月份

RQty INT --数据

)

2. 数据如下

INSERT INTO #TmpTable( RYear, RMonth, RQty)

SELECT T.RYear,T.RMonth,T.RQty FROM

(

SELECT 2011 RYear,1 RMonth,100 RQty

UNION ALL

SELECT 2011 RYear,1 RMonth,100 RQty

UNION ALL

SELECT 2011 RYear,2 RMonth,50 RQty

UNION ALL

SELECT 2010 RYear,1 RMonth,150 RQty

UNION ALL

SELECT 2010 RYear,3 RMonth,125 RQty

UNION ALL

SELECT 2010 RYear,3 RMonth,125 RQty

) T

3. 转换的SQL

SELECT RYear,

SUM(CASE WHEN RMonth=1 THEN RQty ELSE 0 END) JanQty,

SUM(CASE WHEN RMonth=2 THEN RQty ELSE 0 END) FebQty,

SUM(CASE WHEN RMonth=3 THEN RQty ELSE 0 END) MarQty

FROM #TmpTable

GROUP BY RYear