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17 maj 2018 · If you want a date to have a format then you will need to convert it to a data type that can be formatted - i.e. a string: TO_CHAR( TO_DATE( '20180924', 'yyyymmdd' ) + 29, 'YYYYMMDD' )
The best (and to be honest: only sensible) solution is to convert that column to a DATE. Then you can convert the values to any rerpresentation that you want without worrying about implicit data type conversion.
The following statement converts the current system date to a string with the format YYYY-MM-DD: SELECT TO_CHAR( sysdate , 'YYYY-MM-DD' ) FROM dual; Code language: SQL (Structured Query Language) ( sql )
TO_CHAR (datetime) converts a datetime or interval value of DATE, TIMESTAMP, TIMESTAMP WITH TIME ZONE, TIMESTAMP WITH LOCAL TIME ZONE, INTERVAL DAY TO SECOND, or INTERVAL YEAR TO MONTH data type to a value of VARCHAR2 data type in the format specified by the date format fmt.
This statement converts dates as per the format specified in the TO_CHAR function. The iw format represents the week of the year and iyyy format represents a 4-digit year based on the ISO standard. Converts date value to the specified formats
31 gru 1999 · To format a date value, you use the TO_CHAR() function. Both TO_DATE() and TO_CHAR() functions use something called a date format model that describes the format of the date data stored in a character string. Suppose, you have a literal string that represents a date as follows:
11 lis 2019 · where to_char (dateCol, 'YYYY-MM-DD') = to_char (:param, 'YYYY-MM-DD') No, a date doesn't have a format! A date is 7 bytes of binary information - a byte each for the century, year, month, day, hour, minute, and second. It gets formatted when fetched as a string by a client or when implicitly converted in SQL or PLSQL.
