Tips for modifying Oracle time display mode

《Oracle time display modification skills, specific code examples are required》

In the Oracle database, time display is one of the common operational requirements. By default, the display format of time in Oracle database is fixed, but sometimes we need to format the display according to our own needs. This article will introduce how to modify the time display mode in Oracle database and provide specific code examples.

1. Modify the time display format

In the Oracle database, the data type of the time field is usually DATE or TIMESTAMP, and these two types are displayed in the default format It is fixed. If we want to modify the way the time is displayed, we can convert the time field into a string in a specified format by using the TO_CHAR function. The syntax of the TO_CHAR function is as follows:

SELECT TO_CHAR(time_column, 'format') FROM table_name;

Among them, time_column is the time field name, and format is the time formatting template. The following are some commonly used time formatting templates and their meanings:

• YYYY-MM-DD HH24:MI:SS：Year-Month-Day Hour:Minute:Second
• MM /DD/YYYY HH:MI:SS AM：Month/Day/Year Hour:Minute:Second AM/PM
• DD-MON-YYYY HH12:MI:SS AM：Day-Month-Year Hour:Minute :Second AM/PM

2. Specific code example

Assume there is a table named employees, which contains a hire_date field indicating the employee's joining time. We want to display the entry date in the format of "year-month-day". You can use the following SQL statement:

SELECT TO_CHAR(hire_date, 'YYYY-MM-DD') AS hire_date_formatted
FROM employees;

After running the above SQL statement, the hire_date field will be displayed in the format of "year-month-day". If you need to display other formats, just modify the formatting template in the TO_CHAR function.

In addition to using the TO_CHAR function, you can also modify the time display mode by modifying the time format parameters at the session level or system level. You can use the ALTER SESSION statement to modify session-level time format parameters, or use the ALTER SYSTEM statement to modify system-level time format parameters.

Summary: Through the above introduction, we have learned how to modify the display mode of time in the Oracle database, mainly by using the TO_CHAR function to convert the time field into a string in a specified format. At the same time, specific code examples are provided to demonstrate how to modify the time display method. Hope these tips will be helpful to you when dealing with time fields in Oracle database.

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