[Solved] Which of the following is the correct syntax to find rows in table1 but not in table2 using EXCEPT? — Ans: SELECT * FROM table1 EXCEPT SELECT * FROM table2; | PostgreSQL

PostgreSQL - Set Operations and Advanced Queries

Which of the following is the correct syntax to find rows in table1 but not in table2 using EXCEPT?

ASELECT * FROM table1 UNION SELECT * FROM table2;

BSELECT * FROM table1 INTERSECT SELECT * FROM table2;

CSELECT * FROM table1 EXCEPT SELECT * FROM table2;

DSELECT * FROM table1 MINUS SELECT * FROM table2;

Step-by-Step Solution

Solution:

Step 1: Recall EXCEPT syntax
EXCEPT is used as: SELECT ... FROM ... EXCEPT SELECT ... FROM ... to get rows in first query not in second.
Step 2: Check other options
INTERSECT returns common rows, UNION combines all rows, MINUS is not valid in PostgreSQL.
Final Answer:
SELECT * FROM table1 EXCEPT SELECT * FROM table2; -> Option C
Quick Check:
EXCEPT syntax correct = SELECT * FROM table1 EXCEPT SELECT * FROM table2; [OK]

Quick Trick: Use EXCEPT between two SELECTs for difference [OK]

Common Mistakes:

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Which of the following is the correct syntax to find rows in table1 but not in table2 using EXCEPT?