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declare
dateStr varchar2(20);
begin
dateStr := '201219';
dbms_output.put_line( substr(dateStr,0,4) ||
case length(substr(dateStr,5))
when 3 then '0' || substr(dateStr,5)
when 2 then '0' || substr(dateStr,5,1) || '0' || substr(dateStr,6,1)
else substr(dateStr,5) end );
end;
select to_date(decode(substr(datestr,5,1),'1',datestr,substr(datestr,1,4)||'0'||substr(datestr,5)),'yyyymmdd') from tablename;
WITH t AS
(SELECT '201101' num FROM dual
UNION ALL
SELECT '20111' num FROM dual
UNION ALL
SELECT '201111' num FROM dual)
SELECT CASE WHEN length(num) = 6 THEN num
WHEN length(num) = 5 THEN substr(num,1,4)||'0'||substr(num,5,1)
ELSE '日期错误' END
FROM t