mysql 多个数相除

整数除以整数=整数改为：select 1.0 * (select count(RecordID) from RegisterRecord where datediff(yy,WBirthday,getdate())>26) /(select count(RecordID) from RegisterRecord )*100 As 比例(%)

from RegisterRecord

还有就是数据库字段的别名写法不是那样写的

oracle

select mod(523,100) from dual

mysql

select mod(523,100)

sqlserver

select 523%100

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