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The Art of PostgreSQL

Solution Review: Generate Specific Numbers

Explore how to write PostgreSQL queries using the generate_series function to create sequences of dates. Understand methods to list days and dates for the first week of a year or every Monday in a specific month. This lesson helps improve your skills in date handling and SQL query construction for time-based data.

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Task 1

You were asked to write a query to print the days along with the dates for the first week of the year 2023.

Solution

The solution for the task is given below. Click the “Run” button in the following widget to see the output of the code.

PostgreSQL
/********************************************************/
/*****    Write a query to print the days along     *****/
/*****      with the dates for the first week       *****/
/*****             of the year 2023.                *****/
/********************************************************/
select To_Char(dt, 'Day') as day, dt as date
  from generate_series (0, 6) as t(x), 
       date(date '2023-01-01' + x) as dt;
/********************************************************/

Explanation

Following is the explanation of Task 1 of the challenge:

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