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一些关于Oracle的查询操作技巧

2014-06-21 10:22 585 查看
1.查询某一张表中某一个字段的最后2位是XX

select * from where substr([字段], -2)='XX'

2.查询某一张表中某一个字段从第0位开始取2位的查询结果

select substr([字段],0, 2) from


3.更新某一张表中某一个字段中的X1替换为X2

update
set [字段]=replace([字段],'X1','X2')



4.根据年月日计算年龄的查询语句

floor(to_number(sysdate - birthday) / 365) as age
5.根据年龄段分组查询
select age, count(1) as peoplecount

from (select case

when to_char(sysdate, 'yyyy') - to_char(birthday, 'yyyy') >= '0' and

to_char(sysdate, 'yyyy') - to_char(birthday, 'yyyy') < '20' then

'20岁以下'

when to_char(sysdate, 'yyyy') - to_char(birthday, 'yyyy') >= '20' and

to_char(sysdate, 'yyyy') - to_char(birthday, 'yyyy') <= '30' then

'20-30'

when to_char(sysdate, 'yyyy') - to_char(birthday, 'yyyy') >= '30' and

to_char(sysdate, 'yyyy') - to_char(birthday, 'yyyy') <= '40' then

'30-40'

when to_char(sysdate, 'yyyy') - to_char(birthday, 'yyyy') >= '40' and

to_char(sysdate, 'yyyy') - to_char(birthday, 'yyyy') <= '50' then

'40-50'

when to_char(sysdate, 'yyyy') - to_char(birthday, 'yyyy') >= '50' and

to_char(sysdate, 'yyyy') - to_char(birthday, 'yyyy') <= '60' then

'50-60'

when to_char(sysdate, 'yyyy') - to_char(birthday, 'yyyy') > '60' then

'60岁以上'

else

'其他'

end as age

from
where birthday is not null)

group by age

order by peoplecount

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