oracle decode用法

DECODE(value,if1,then1,if2,then2,if3,then3,...,else)

decode(条件,值1,返回值1,值2,返回值2,...值n,返回值n,缺省值)

select count() from 表 where 性别 = 男;
select count(
) from 表 where 性别 = 女;
要想显示到一起还要union一下,太麻烦了
用decode呢,只需要一句话
例:select decode(性别,男,1,0),decode(性别,女,1,0) from 表


例:select id,username,age,decode(sex,0,‘男‘,1,‘女‘)

select * from wv_zmm_get_vendor_base t
where
t.ktokk != ‘Z011‘ and t.bukrs = decode($gsdm$,2,8000,decode($gsdm$,3,8010,decode($gsdm$,4,8080,0)))

来源:迅闻网

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