How to Extract A Weekday From A Timestamp In Postgresql?

In PostgreSQL, you can extract the weekday from a timestamp by using the EXTRACT() function. The syntax for extracting a weekday from a timestamp is as follows:

SELECT EXTRACT(DOW FROM timestamp_column) AS weekday FROM table_name;

This query will return the weekday as a number, where 0 represents Sunday, 1 represents Monday, and so on until 6 which represents Saturday. You can also use the to_char() function to convert the number to the actual weekday name if needed.

How to extract a weekday from a timestamp in PostgreSQL?

In PostgreSQL, you can extract the weekday from a timestamp using the EXTRACT function along with the DOW parameter.

Here is an example query that shows how to extract the weekday from a timestamp:

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SELECT EXTRACT(DOW FROM TIMESTAMP '2022-01-05 12:00:00') AS weekday_number,
       CASE
         WHEN EXTRACT(DOW FROM TIMESTAMP '2022-01-05 12:00:00') = 0 THEN 'Sunday'
         WHEN EXTRACT(DOW FROM TIMESTAMP '2022-01-05 12:00:00') = 1 THEN 'Monday'
         WHEN EXTRACT(DOW FROM TIMESTAMP '2022-01-05 12:00:00') = 2 THEN 'Tuesday'
         WHEN EXTRACT(DOW FROM TIMESTAMP '2022-01-05 12:00:00') = 3 THEN 'Wednesday'
         WHEN EXTRACT(DOW FROM TIMESTAMP '2022-01-05 12:00:00') = 4 THEN 'Thursday'
         WHEN EXTRACT(DOW FROM TIMESTAMP '2022-01-05 12:00:00') = 5 THEN 'Friday'
         WHEN EXTRACT(DOW FROM TIMESTAMP '2022-01-05 12:00:00') = 6 THEN 'Saturday'
       END AS weekday_name;

In this query, we first use the EXTRACT(DOW FROM timestamp) function to extract the numeric representation of the weekday (0 for Sunday, 1 for Monday, and so on). Then, we use a CASE statement to map the numeric representation to the corresponding weekday name. This will allow you to extract and display the weekday from a timestamp in PostgreSQL.

What is the data type for a weekday in PostgreSQL?

The data type for a weekday in PostgreSQL is "date" where the value represents a date in the week, starting from Sunday as 0 and ending with Saturday as 6.

How to get the day name from a timestamp in PostgreSQL?

You can use the to_char function in PostgreSQL to extract the day name from a timestamp. Here's an example query that demonstrates how to do this:

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SELECT to_char(current_timestamp, 'Day') AS day_name;

In this query, current_timestamp represents the timestamp for which you want to retrieve the day name. The format 'Day' specifies that you want to extract the full name of the day (e.g., Monday, Tuesday, etc.).

You can customize the format specifier according to your requirements. For example, you can use 'Dy' to get the abbreviated day name (e.g., Mon, Tue, etc.) or 'D' to get the numerical representation of the day (1 for Sunday, 2 for Monday, etc.).

Simply replace current_timestamp with your timestamp column or value in the SELECT statement to get the day name for that specific timestamp.