MIN()() — SQL Technical Interview Questions & Answers

MIN()()

MIN()()

  • MIN(marks) lowest value, skips NULL. SELECT name, marks FROM students WHERE marks = (SELECT MIN(marks) FROM students); can return several students who tied.
  • MIN on strings is alphabetical (collation). MIN on dates is earliest.
  • Trap: MIN as ‘first inserted row’ — it is not, unless you MIN(id).
  • On the example next to this theory: MIN()() — aggregate functions collapse many rows into one summary row.

Technical Interview Tip: MIN(marks) lowest score. Subquery to get those students.

Code Examples for MIN()()

MIN()() — sample query

CREATE TABLE scores (id INTEGER PRIMARY KEY, marks INTEGER);
INSERT INTO scores VALUES (1, 80), (2, 90), (3, 70);
SELECT COUNT(*) AS n, AVG(marks) AS avg_marks, MAX(marks) AS top
FROM scores;

MIN()() — aggregate functions collapse many rows into one summary row.

How to Explain MIN()() to an Interviewer

Lowest marks?

SELECT MIN(marks) FROM students