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select tscoreId, tsid, tenglish, 评级=case when tenglish>=95 then ‘优秀‘ when tenglish>=90 then ‘良好‘ when tenglish>=80 then ‘中‘ when tenglish is null then ‘缺考‘ else ‘以后的比尔盖茨‘ endfrom TblScore
then 后面的数据后类型必须一致
- 是等值判断
select tscoreId, tsid, tenglish, 评级= case tenglish- when 100 then ‘一百分‘
- when 90 then ‘九十分‘
endfrom TblScore
相当于switch
Create table Test1( A int, B int)insert into Test1(10,20)insert into Test1(100,21) select A,B,AOrB= case when A>B then A else B endfrom Test1
统计每个销售员的总销售金额，列出销售员名称，总销售金额、称号（>6000金牌；>5500银牌；...）
select
销售员,
销售总金额=sum(销售数量*销售价格),
称号=
case
when sum(销售数量*销售价格)>6000 then ‘金牌销售员‘
when sum(销售数量*销售价格)>5500 then ‘银牌销售员‘
when sum(销售数量*销售价格)>4500 then ‘铜牌销售员‘
else ‘普通销售员‘
end
from Order
group by 销售员
order by 销售总金额 desc
create table Test1(
number varchar(10),
amount int
)
insert into Test(number ,amount) values (‘RK1‘，10)
insert into Test(number ,amount) values (‘RK2‘，20)
insert into Test(number ,amount) values (‘RK3‘，-30)
insert into Test(number ,amount) values (‘RK4‘，-10)
正数为收入，负数支出
单号|收入|支出
select
number,
收入=
case
when amount>0 then amount
end
黑马视频-SQL之case
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原文地址：http://www.cnblogs.com/wupd2014/p/4964871.html
