--测试数据
DECLARE @t TABLE(ID int PRIMARY KEY,col decimal(10,2))
INSERT @t SELECT 1 ,26.21
UNION ALL SELECT 2 ,88.19
UNION ALL SELECT 3 , 4.21
UNION ALL SELECT 4 ,76.58
UNION ALL SELECT 5 ,58.06
UNION ALL SELECT 6 ,53.01
UNION ALL SELECT 7 ,18.55
UNION ALL SELECT 8 ,84.90
UNION ALL SELECT 9 ,95.60
--统计
SELECT a.Description,
Record_count=COUNT(b.ID),
[Percent]=CASE
WHEN Counts=0 THEN '0.00%'
ELSE CAST(CAST(
COUNT(b.ID)*100./c.Counts
as decimal(10,2)) as varchar)+'%'
END
FROM(
SELECT sid=1,a=NULL,b=30 ,Description='<30' UNION ALL
SELECT sid=2,a=30 ,b=60 ,Description='>=30 and <60' UNION ALL
SELECT sid=3,a=60 ,b=75 ,Description='>=60 and <75' UNION ALL
SELECT sid=4,a=75 ,b=95 ,Description='>=75 and <95' UNION ALL
SELECT sid=5,a=95 ,b=NULL,Description='>=95'
)a LEFT JOIN @t b
ON (b.col<a.b OR a.b IS NULL)
AND(b.col>=a.a OR a.a IS NULL)
CROSS JOIN(
SELECT COUNTS=COUNT(*) FROM @t
)c
GROUP BY a.Description,a.sid,c.COUNTS
ORDER BY a.sid
/*--结果:
Description Record_count Percent
------------------- ------------------ ----------------------
<30 3 33.33%
>=30 and <60 2 22.22%
>=60 and <75 0 0.00%
>=75 and <95 3 33.33%
>=95 1 11.11%
--*/
转载于:https://www.cnblogs.com/antony1029/archive/2010/08/03/1791639.html
