Which of the following correctly demonstrates how to declare a Common Table Expression (CTE) in PostgreSQL?

easy📝 Syntax Q3 of 15

PostgreSQL - Common Table Expressions

AWITH cte_name AS (SELECT * FROM table_name) SELECT * FROM cte_name;

BDEFINE cte_name SELECT * FROM table_name; SELECT * FROM cte_name;

CCREATE CTE cte_name SELECT * FROM table_name; SELECT * FROM cte_name;

DCTE cte_name = (SELECT * FROM table_name); SELECT * FROM cte_name;

Step-by-Step Solution

Solution:

Step 1: Recall CTE syntax
CTEs in PostgreSQL start with WITH, followed by the CTE name, AS, and a subquery in parentheses.
Step 2: Validate options
Only WITH cte_name AS (SELECT * FROM table_name) SELECT * FROM cte_name; matches the correct syntax: WITH cte_name AS (SELECT ...) SELECT ...
Final Answer:
WITH cte_name AS (SELECT * FROM table_name) SELECT * FROM cte_name; -> Option A
Quick Check:
WITH ... AS (subquery) is correct syntax [OK]

Quick Trick: CTE syntax starts with WITH ... AS (subquery) [OK]

Common Mistakes:

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