oracle to_namber以後報ora-01722:無效數字

寫的sql:

select 

 to_number(substr(B.年齡, 1, instr(B.年齡, '天') - 1)) as 年齡, A.病人id, A.主頁id

  from 病案主頁 A, 病人信息 B

 where A.病人ID = B.病人ID

   and A.主頁ID = B.主頁ID

   and to_number(substr(B.年齡, 1, instr(B.年齡, '天') - 1)) < 29

   and B.年齡 not like '%歲%'

   and B.年齡 not like '%月%'

報錯:

加上強制規則,運行經過:

select /*+rule*/

 to_number(substr(B.年齡, 1, instr(B.年齡, '天') - 1)) as 年齡, A.病人id, A.主頁id

  from 病案主頁 A, 病人信息 B

 where A.病人ID = B.病人ID

   and A.主頁ID = B.主頁ID

   and to_number(substr(B.年齡, 1, instr(B.年齡, '天') - 1)) < 29

   and B.年齡 not like '%歲%'

   and B.年齡 not like '%月%'

注意:

and to_number(substr(B.年齡, 1, instr(B.年齡, '天') - 1)) < 29

不能放在最後一個條件,不然也會報錯！