Solution:Step 1: Understand requirement for all students and scoresFULL OUTER JOIN returns all rows from both tables, including unmatched ones with NULLs.Step 2: Evaluate optionsSELECT Students.ID, Name, Score FROM Students FULL OUTER JOIN Scores ON Students.ID = Scores.ID ORDER BY Students.ID; uses

[Solved] You have two tables:Students:ID | Name1 | John2 | Jane3 | MikeScores:ID | Score2 | 853 | 904 | 75Write a query using FULL OUTER JOIN to list all students and scores, showing NULL where data is... | PostgreSQL

PostgreSQL - Joins in PostgreSQL

ASELECT Students.ID, Name, Score FROM Students LEFT JOIN Scores ON Students.ID = Scores.ID;

BSELECT Students.ID, Name, Score FROM Students RIGHT JOIN Scores ON Students.ID = Scores.ID;

CSELECT Students.ID, Name, Score FROM Students FULL OUTER JOIN Scores ON Students.ID = Scores.ID ORDER BY Students.ID;

DSELECT Students.ID, Name, Score FROM Students INNER JOIN Scores ON Students.ID = Scores.ID;

Step-by-Step Solution

Solution:

Step 1: Understand requirement for all students and scores
FULL OUTER JOIN returns all rows from both tables, including unmatched ones with NULLs.
Step 2: Evaluate options
SELECT Students.ID, Name, Score FROM Students FULL OUTER JOIN Scores ON Students.ID = Scores.ID ORDER BY Students.ID; uses FULL OUTER JOIN correctly. Options A and C return only one side fully. SELECT Students.ID, Name, Score FROM Students INNER JOIN Scores ON Students.ID = Scores.ID; returns only matching rows.
Final Answer:
SELECT Students.ID, Name, Score FROM Students FULL OUTER JOIN Scores ON Students.ID = Scores.ID ORDER BY Students.ID; -> Option C
Quick Check:
FULL OUTER JOIN for all rows = B [OK]

Quick Trick: Use FULL OUTER JOIN to combine all rows from both tables [OK]

Common Mistakes:

Using LEFT or RIGHT JOIN instead of FULL OUTER JOIN
Forgetting ORDER BY for clarity
Using INNER JOIN which excludes unmatched rows

Master "Joins in PostgreSQL" in PostgreSQL

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You have two tables:

Step 1: Understand requirement for all students and scores

Step 2: Evaluate options

Final Answer:

Quick Check:

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