Some processing fields of oracle

Query table field annotations

select *
from user_col_comments co
where Table_Name='LC_APPL' and co.comments like'%自动%'

Query nvl function and split function to_char

SELECT l.appl_seq,
       lc.appl_ac_no,
       case
         when lc.appl_ac_kind = '01' then
          'Debit card number'
         when lc.appl_ac_kind = '02' then
          'Repayment card number'
       end cardtype
  FROM lc_appl l
  join lc_appl_acc_info lc
    on l.appl_seq = lc.appl_seq
 where substr(nvl(l.last_chg_dt, to_char(sysdate - 1, 'yyyy-MM-dd')), 1, 10) =
       to_char(sysdate, 'yyyy-MM-dd')
   and lc.appl_ac_no is not null;