oracle to_namber之后报ora-01722:无效数字

4323213

写的sql:

select
to_number(substr(B.年龄, 1, instr(B.年龄, '天') - 1)) as 年龄, A.病人id, A.主页id
  from 病案主页 A, 病人信息 B
where A.病人ID = B.病人ID
   and A.主页ID = B.主页ID
   and to_number(substr(B.年龄, 1, instr(B.年龄, '天') - 1)) < 29
   and B.年龄 not like '%岁%'
   and B.年龄 not like '%月%'
报错:

加上强制规则,运行通过:

select /*+rule*/

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

  from 病案主页 A, 病人信息 B

where A.病人ID = B.病人ID

   and A.主页ID = B.主页ID

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

   and B.年龄 not like '%岁%'

   and B.年龄 not like '%月%'

注意:

and to_number(substr(B.年龄, 1, instr(B.年龄, '天') - 1)) < 29
不能放在最后一个条件,否则也会报错！