How to Convert Date to Datetime In Oracle?

To convert a date to a datetime in Oracle, you can use the TO_TIMESTAMP function. This function takes a date value as input and converts it to a datetime value. The syntax for using TO_TIMESTAMP is as follows:

TO_TIMESTAMP(date_value, 'format_mask')

In this syntax, date_value is the date value that you want to convert to a datetime value, and format_mask is the format in which the date is stored. The format_mask parameter is optional, but it is recommended to use it to ensure that the date is converted correctly.

For example, if you have a date value stored in the format 'dd-MON-yyyy', you can convert it to a datetime value using the following query:

SELECT TO_TIMESTAMP('01-JAN-2022', 'dd-MON-yyyy') FROM dual;

This query will convert the date '01-JAN-2022' to a datetime value in Oracle. You can also use different format masks depending on how the date is stored in your database.

What is the default date format in Oracle?

The default date format in Oracle is "DD-MON-YY" (e.g. 10-OCT-21).

How to calculate the difference between two dates in Oracle?

To calculate the difference between two dates in Oracle, you can use the DATEDIFF function or subtract one date from the other. Here are two ways to calculate the difference between two dates in Oracle:

1. Using DATEDIFF function:

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SELECT DATEDIFF('day', date1, date2) AS date_difference
FROM your_table;

Replace date1 and date2 with the actual dates you want to calculate the difference between and your_table with the name of your table.

1. Using subtraction:

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SELECT date1 - date2 AS date_difference
FROM your_table;

Again, replace date1 and date2 with the actual dates you want to calculate the difference between and your_table with the name of your table. This will return the difference between the two dates in days.

You can also calculate the difference in hours, minutes, etc., by changing the date part in the DATEDIFF function or modifying the subtraction operation accordingly.

How to convert a date to a timestamp in Oracle?

In Oracle, you can convert a date to a timestamp by using the TO_TIMESTAMP function. Here is the syntax for converting a date to a timestamp:

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SELECT TO_TIMESTAMP('yyyy-mm-dd hh24:mi:ss', 'yyyy-mm-dd hh24:mi:ss') FROM <table_name>;

For example, if you have a date column called date_column in a table called example_table, you can convert it to a timestamp like this:

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SELECT TO_TIMESTAMP(date_column, 'yyyy-mm-dd hh24:mi:ss') FROM example_table;

This will convert the date in the date_column to a timestamp format. Make sure to adjust the format mask in the TO_TIMESTAMP function according to the format of your date column.