知識點：

用mysql,按年齡段查詢一張居民的數(shù)據(jù)(各年齡段居民的個數(shù))

1.如：查詢resident(居民表)，按照各年齡段，統(tǒng)計人數(shù)

2.mysql語句如下：

select ageproportion as ‘年齡段‘,count(*) as ‘人數(shù)‘ from

(

SELECT

CASE

when age>0 and age<=10 then ‘0-10歲‘

when age>10 and age<=20 then ‘10-20歲‘

when age>20 and age<=30 then ‘20-30歲‘

when age>30 and age<=40 then ‘30-40歲‘

when age>40 and age<=50 then ‘40-50歲‘

when age>50 and age<=60 then ‘50-60歲‘

else ‘60歲以上‘

END

as ageproportion from resident

)a GROUP BY ageproportion

3.查詢結(jié)果：

總結(jié)

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