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How to Convert Extracted Value From Datetime to Char In Oracle?

3 minutes read

In Oracle, you can convert a value extracted from a datetime column to a character data type using the TO_CHAR function. This function allows you to specify the format in which you want the datetime value to be displayed as a character string.


For example, if you have extracted a datetime value '2022-05-15 10:30:00' from a column and you want to convert it to a character data type in the format 'YYYY/MM/DD HH24:MI:SS', you can use the following SQL statement:


SELECT TO_CHAR(datetime_column, 'YYYY/MM/DD HH24:MI:SS') AS char_value FROM your_table;


This will convert the datetime value to a character string in the specified format. You can customize the format mask according to your requirements.


How to convert datetime to char and handle time zone conversion in oracle?

To convert a datetime to a char in Oracle and handle time zone conversion, you can use the TO_CHAR and FROM_TZ functions.


Here is an example query that demonstrates how to convert a datetime to a char and handle time zone conversion in Oracle:

1
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SELECT TO_CHAR(FROM_TZ(SYSTIMESTAMP, 'UTC') AT TIME ZONE 'GMT', 'YYYY-MM-DD HH24:MI:SS') AS converted_datetime
FROM dual;


In this example:

  • SYSTIMESTAMP gets the current system timestamp.
  • FROM_TZ converts the system timestamp to a timestamp with time zone value.
  • AT TIME ZONE 'GMT' converts the timestamp to the GMT time zone.
  • TO_CHAR converts the timestamp to a char format with the specified date/time format ('YYYY-MM-DD HH24:MI:SS').


You can adjust the time zone values ('UTC', 'GMT') and date/time format ('YYYY-MM-DD HH24:MI:SS') in the query based on your requirements.


What is the impact of timezone settings on converting datetime to char in oracle?

The impact of timezone settings on converting datetime to char in Oracle is that the conversion may be affected by the timezone offset.


When converting a datetime value to a character data type using the TO_CHAR function in Oracle, the timezone setting of the database session or the TO_CHAR function itself will determine how the datetime value is displayed. If the timezone setting is not specified, the default timezone of the database will be used.


If the timezone setting is different from the actual timezone of the datetime value, the conversion may result in a different value being displayed. This can lead to confusion or inaccuracies in the representation of the datetime value.


It is important to ensure that the timezone setting is correctly configured when converting datetime values to characters in Oracle to accurately represent the datetime value in the desired timezone.


What is the default format for converting datetime to char in oracle?

The default format for converting datetime to char in Oracle is "DD-MON-RR HH.MI.SSXFF AM".


What is the performance impact of converting datetime to char in oracle?

Converting datetime to char in Oracle can have a performance impact, as it involves datatype conversion and formatting. When converting datetime to char, Oracle has to perform additional processing to convert the data which can result in increased CPU usage and potential slowdowns in query performance.


It is important to consider the impact on performance when converting datetime to char in Oracle and make sure to use it judiciously and only when necessary. If possible, it is recommended to perform any necessary datetime manipulation or formatting in the application layer rather than in the database to minimize the performance impact.

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