PostgreSQL - Common Table Expressions
Which of the following is the correct way to define a CTE named
employee_list that selects all columns from the employees table?Which of the following is the correct way to define a CTE named employee_list that selects all columns from the employees table?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Recall correct CTE syntax
The correct syntax is: WITH cte_name AS (subquery) SELECT ...Step 2: Analyze options
WITH employee_list AS (SELECT * FROM employees) SELECT * FROM employee_list; follows the correct syntax. Options B, C, and D have syntax errors such as missing AS or incorrect assignment.Final Answer:
WITH employee_list AS (SELECT * FROM employees) SELECT * FROM employee_list; -> Option DQuick Check:
WITH ... AS (subquery) [OK]
Quick Trick: CTE syntax: WITH name AS (query) [OK]
Common Mistakes:
- Omitting AS keyword
- Using equals sign instead of AS
- Not enclosing subquery in parentheses
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