PostgreSQL - Common Table Expressions
Which keyword is used to start a Common Table Expression (CTE) in PostgreSQL?
Which keyword is used to start a Common Table Expression (CTE) in PostgreSQL?
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Identify the keyword for CTE
In PostgreSQL, the keywordWITHis used to start a Common Table Expression.Step 2: Confirm other keywords are not for CTE
SELECT,FROM, andJOINare parts of the main query, not for defining CTEs.Final Answer:
WITH -> Option DQuick Check:
CTE start keyword = WITH [OK]
Quick Trick: CTEs always start with WITH keyword [OK]
Common Mistakes:
- Using SELECT to start CTE
- Confusing FROM as CTE start
- Trying JOIN to define CTE
Master "Common Table Expressions" in PostgreSQL
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