To convert a date to a datetime in Oracle, you can simply cast the date as a timestamp using the TO_TIMESTAMP function. This function takes the date as an argument and converts it to a timestamp datatype. For example, if you have a date column named 'date_column' in a table named 'table_name', you can convert it to a datetime by using the following SQL query:
SELECT TO_TIMESTAMP(date_column) FROM table_name;
This will convert the date to a datetime format in Oracle. Remember that when you convert a date to a datetime, the time portion will default to midnight (00:00:00).
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How do I convert a date value to datetime in oracle SQL?
You can convert a date value to a datetime value in Oracle SQL by using the TO_TIMESTAMP function. Here is an example of how you can do this:
SELECT TO_TIMESTAMP('2022-03-15', 'YYYY-MM-DD') FROM DUAL;
This will convert the date '2022-03-15' to a datetime value in Oracle SQL.
What is the purpose of converting date to datetime in oracle?
Converting a date to a datetime in Oracle can be useful for operations that require both a date and time component, such as sorting by date and time, performing calculations that involve time intervals, or comparing date values that have different time components. By converting a date to a datetime, you can include a time component to make your data more precise and flexible in your queries and calculations.
What is the storage requirement for datetime data type in oracle?
The storage requirement for the datetime data type in Oracle varies depending on the specific subtype of datetime data being stored. The following are the storage requirements for some commonly used datetime subtypes in Oracle:
- DATE: The DATE data type in Oracle requires 7 bytes of storage. It stores both date and time information.
- TIMESTAMP: The TIMESTAMP data type in Oracle requires 11 bytes of storage for timestamp(0) up to 20 bytes for timestamp(9). The TIMESTAMP data type stores date and time information down to fractional seconds.
- TIMESTAMP WITH TIME ZONE: The TIMESTAMP WITH TIME ZONE data type in Oracle requires 13 bytes of storage for timestamp(0) up to 22 bytes for timestamp(9). This subtype stores date and time information with time zone information.
- TIMESTAMP WITH LOCAL TIME ZONE: The TIMESTAMP WITH LOCAL TIME ZONE data type in Oracle requires 13 bytes of storage for timestamp(0) up to 22 bytes for timestamp(9). This subtype stores date and time information with time zone information adjusted to the database session time zone.
It is important to note that these storage requirements can vary based on the specific configuration of the database and any additional options or settings applied to the datetime columns.
