mysql 截取字符串中的数字

    select  REVERSE(right(REVERSE(filename),length(filename)-LEAST(

    if(Locate('0',REVERSE(filename)) >0,Locate('0',REVERSE(filename)),999),

    if(Locate('1',REVERSE(filename)) >0,Locate('1',REVERSE(filename)),999),

    if(Locate('2',REVERSE(filename)) >0,Locate('2',REVERSE(filename)),999),

    if(Locate('3',REVERSE(filename)) >0,Locate('3',REVERSE(filename)),999),

    if(Locate('4',REVERSE(filename)) >0,Locate('4',REVERSE(filename)),999),

    if(Locate('5',REVERSE(filename)) >0,Locate('5',REVERSE(filename)),999),

    if(Locate('6',REVERSE(filename)) >0,Locate('6',REVERSE(filename)),999),

    if(Locate('7',REVERSE(filename)) >0,Locate('7',REVERSE(filename)),999),

    if(Locate('8',REVERSE(filename)) >0,Locate('8',REVERSE(filename)),999),

    if(Locate('9',REVERSE(filename)) >0,Locate('9',REVERSE(filename)),999)

  )+1)),filename

   from homework

select REVERSE(right(REVERSE(filename),length(filename)-LEAST(

if(Locate('0',REVERSE(filename)) >0,Locate('0',REVERSE(filename)),999),

if(Locate('1',REVERSE(filename)) >0,Locate('1',REVERSE(filename)),999),

if(Locate('2',REVERSE(filename)) >0,Locate('2',REVERSE(filename)),999),

if(Locate('3',REVERSE(filename)) >0,Locate('3',REVERSE(filename)),999),

if(Locate('4',REVERSE(filename)) >0,Locate('4',REVERSE(filename)),999),

if(Locate('5',REVERSE(filename)) >0,Locate('5',REVERSE(filename)),999),

if(Locate('6',REVERSE(filename)) >0,Locate('6',REVERSE(filename)),999),

if(Locate('7',REVERSE(filename)) >0,Locate('7',REVERSE(filename)),999),

if(Locate('8',REVERSE(filename)) >0,Locate('8',REVERSE(filename)),999),

if(Locate('9',REVERSE(filename)) >0,Locate('9',REVERSE(filename)),999)

)+1)),filename

from homework

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