PostgreSQL - Joins in PostgreSQL
Which of the following is the correct way to write a FULL OUTER JOIN query in PostgreSQL to combine tables
users and orders on the user_id column?Which of the following is the correct way to write a FULL OUTER JOIN query in PostgreSQL to combine tables users and orders on the user_id column?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Identify the correct JOIN syntax
PostgreSQL usesFULL OUTER JOINorFULL JOINinterchangeably.Step 2: Check the ON clause
The join condition must be specified withON users.user_id = orders.user_id.Step 3: Verify the full query
SELECT * FROM users FULL OUTER JOIN orders ON users.user_id = orders.user_id; correctly usesFULL OUTER JOINwith the proper ON clause.Final Answer:
SELECT * FROM users FULL OUTER JOIN orders ON users.user_id = orders.user_id; -> Option BQuick Check:
Syntax matches PostgreSQL FULL OUTER JOIN format [OK]
Quick Trick: Use FULL OUTER JOIN with ON clause for correct syntax [OK]
Common Mistakes:
- Using WHERE instead of ON for join condition
- Incorrect order of JOIN keywords
- Using non-existent keywords like OUTER FULL JOIN
Master "Joins in PostgreSQL" in PostgreSQL
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