How does Oracle modify the time format?

Modification of the time format in Oracle database is very common in actual development. This article will introduce how to modify the time format in Oracle database and provide specific code examples.

In Oracle database, there are two main time data types: DATE and TIMESTAMP. The DATE type stores date and time, while the TIMESTAMP type can store higher-precision time information. When modifying the time format, you can use the TO_CHAR function.

Below we will use some specific examples to demonstrate how to modify the time format.

Example 1: Convert the date and time format to the specified format

Suppose we have a date and time field of '2022-10-22 14:30:00', and now we want to convert it For the format of '14:30 on October 22, 2022', you can use the following code:

SELECT TO_CHAR(TO_DATE('2022-10-22 14:30:00', 'YYYY-MM-DD HH24:MI:SS'), 'YYYY"年"MM"月"DD"日" HH"时"MI"分"') 
FROM dual;

Example 2: Convert the date format to only display the year, month and day

If you only need To display the year, month and day part of the date, you can use the following code:

SELECT TO_CHAR(SYSDATE, 'YYYY-MM-DD') 
FROM dual;

Example 3: Convert the time format to display only the hours, minutes and seconds

If you only need to display the hours, minutes and seconds of the time, you can use The following code:

SELECT TO_CHAR(SYSDATE, 'HH24:MI:SS') 
FROM dual;

Example 4: Convert date and time format to month name format

If you need to convert the date and time field into a format with month name, you can use the following code:

SELECT TO_CHAR(TO_DATE('2022-10-22', 'YYYY-MM-DD'), 'YYYY"年"MM"月"DD"日"') 
FROM dual;

Conclusion

Through the above example, we can see how to modify the time format in the Oracle database. By using the TO_CHAR function, we can flexibly format the time field according to our own needs, making it more consistent with actual display needs. During use, you need to select the appropriate format string according to the specific time format requirements to achieve the expected display effect.

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