I got ” ORA-01810 format code appears twice ” error in Oracle database.
ORA-01810 format code appears twice
Details of error are as follows.
ORA-01810 format code appears twice Cause: A format code was listed twice in a date specification. Each format code may be specified only once in the function TO_DATE. Action: Remove the duplicate format code from the date specification, then retry the operation.
format code appears twice
This ORA-01810 error is related with the format code was listed twice in a date specification. Each format code may be specified only once in the function TO_DATE.
Remove the duplicate format code from the date specification, then retry the operation.
TO_DATE function format codes are as follows, so check your code and fix the error.
| Format Code | Explanation |
|---|---|
| YEAR | Year, spelled out |
| YYYY | 4-digit year |
| MM | Month (01-12; JAN = 01). |
| MON | Abbreviated name of month. |
| MONTH | Name of month, padded with blanks to length of 9 characters. |
| D | Day of week (1-7). |
| DAY | Name of day. |
| DD | Day of month (1-31). |
| DDD | Day of year (1-366). |
| DY | Abbreviated name of day. |
| HH | Hour of day (1-12). |
| HH12 | Hour of day (1-12). |
| HH24 | Hour of day (0-23). |
| MI | Minute (0-59). |
| SS | Second (0-59). |
| SSSSS | Seconds past midnight (0-86399). |
For example; If you run the following code, you will get this error.
SELECT TO_DATE('2021/05/06 4:29 PM', 'YYYY/MM/DD HH:MM PM' ) FROM dual;
You got this error, because you have used MM twice, you should use the MI instead of MM as follows.
SELECT TO_DATE('2021/05/06 4:29 PM', 'YYYY/MM/DD HH:MI PM' ) FROM dual;
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