Mysql 按字符串的某个部分排序
我在生成的代码列中有这些值Mysql 按字符串的某个部分排序,mysql,sql,sql-order-by,Mysql,Sql,Sql Order By,我在生成的代码列中有这些值 NEW 6y0m !EW 0y8m N!W 5y11m !EW 17y0m 我想根据位于空间后面和“y”之前的年份进行升序。结果应该是这样的 !EW 17y0m NEW 6y0m N!W 5y11m !EW 0y8m 我尝试了这个,但它返回空集 select mid(generated_code,4,LOCATE(generated_code,'y')-6) from classifier_bahrain order by mid(gener
NEW 6y0m
!EW 0y8m
N!W 5y11m
!EW 17y0m
我想根据位于空间后面和“y”之前的年份进行升序。结果应该是这样的
!EW 17y0m
NEW 6y0m
N!W 5y11m
!EW 0y8m
我尝试了这个,但它返回空集
select
mid(generated_code,4,LOCATE(generated_code,'y')-6)
from
classifier_bahrain
order by
mid(generated_code,4,LOCATE(generated_code,'y')-6) desc
locate
功能的参数顺序应相反。此外,如果您尝试按子字符串排序,则其顺序将为6,5,17,0因此,在对结果排序之前将其转换为int 试试这个:
SELECT generated_code,SUBSTR(generated_code,4,locate('y',generated_code)-4) as ORDERBY
FROM classifier_bahrain
ORDER BY CAST(SUBSTR(generated_code,4,locate('y',generated_code)-4) AS UNSIGNED) DESC
结果:
GENERATED_CODE ORDERBY
!EW 17y0m 17
NEW 6y0m 6
N!W 5y11m 5
!EW 0y8m 0
见结果