How to Get All Days of the Week in SQL Using CTE

Learn how to retrieve all days of the week in SQL with a simple Common Table Expression (CTE) query. Step-by-step example included.

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To get all days of the week in SQL, you can use a Common Table Expression (CTE) like this: `WITH WeekDays AS (SELECT 'Monday' as Day UNION SELECT 'Tuesday' UNION SELECT 'Wednesday' UNION SELECT 'Thursday' UNION SELECT 'Friday' UNION SELECT 'Saturday' UNION SELECT 'Sunday') SELECT Day FROM WeekDays;`. This will return each day in a new row.

FAQs & Answers

  1. What is a Common Table Expression (CTE) in SQL? A Common Table Expression (CTE) is a temporary named result set in SQL that you can reference within a SELECT, INSERT, UPDATE, or DELETE statement for improved query clarity and reusability.
  2. Can I generate all days of the week dynamically in SQL without hardcoding? Yes, you can use SQL functions and recursive CTEs to dynamically generate days of the week, but for a fixed list, hardcoding with UNION as shown is often simpler and more performant.
  3. How can I use the list of days of the week in SQL queries? You can join the generated list of days with other tables to display or filter records by day, helping in reporting, scheduling, or date-related calculations.

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