[Solved] Identify the error in this INNER JOIN query:SELECT * FROM orders INNER JOIN customers ON orders.customer_id = customers.id WHERE orders.date > '2023-01-01' | PostgreSQL

PostgreSQL - Joins in PostgreSQL

Identify the error in this INNER JOIN query:

SELECT * FROM orders INNER JOIN customers ON orders.customer_id = customers.id WHERE orders.date > '2023-01-01'

AMissing table alias causing ambiguity.

BWHERE clause cannot be used with INNER JOIN.

CNo error; query is valid and will run correctly.

DIncorrect join condition syntax; should use USING instead of ON.

Step-by-Step Solution

Solution:

Step 1: Check JOIN syntax and WHERE clause
The INNER JOIN uses ON with a valid condition. The WHERE clause filters rows after the join, which is allowed.
Step 2: Verify if any syntax or semantic errors exist
There is no ambiguity or syntax error. Aliases are optional. USING is an alternative but not required.
Final Answer:
No error; query is valid and will run correctly. -> Option C
Quick Check:
INNER JOIN with ON and WHERE is valid [OK]

Quick Trick: WHERE filters after JOIN; no syntax error here [OK]

Common Mistakes:

Master "Joins in PostgreSQL" in PostgreSQL

9 interactive learning modes - each teaches the same concept differently

Identify the error in this INNER JOIN query: