ORA-01861: Literal Does Not Match Format String - Oracle Error Solution

ORA-01861: literal does not match format string is an Oracle database error indicating that the input text doesn't align with the specified format string.

The solution depends on the specific situation where you encounter this error. Here are some potential fixes:

1. Check the Format String: Ensure the format string you provide matches the actual input text. For example, if you use a date formatting function like TO_DATE, make sure the format string aligns with the input date format.

2. Verify Date Format: If you're using a date formatting function, ensure the input date text matches the specified date format. For instance, if you use 'YYYY-MM-DD' format, the input date text should adhere to this format.

3. Inspect Other Inputs: Beyond date formats, check for other potential input errors. For example, if you use the TO_NUMBER function, make sure the input text can be converted to a valid number.

4. Employ Appropriate Conversion Functions: Based on your needs, you might need different conversion functions. If you want to convert a date to a string, use the TO_CHAR function instead of TO_DATE.

5. Examine NLS Settings: If your database utilizes distinct NLS settings, consider different date and time formats. Ensure your format string is compatible with the database's NLS settings.

If the above methods don't resolve the issue, provide more details like your SQL query or PL/SQL code for a more accurate understanding and a targeted solution.