Interview Q&A / SQL & DBMS

INTERVIEW Q&A · 69 QUESTIONS

SQL & DBMS interview questions

Joins, keys, normalisation, indexes and transactions for placement and backend interviews.

  1. How do you fetch only the first N rows in MySQL, SQL Server and Oracle?

    MySQL and PostgreSQL use LIMIT n, SQL Server uses SELECT TOP n, and the SQL standard (Oracle 12c and later, PostgreSQL, SQL Server) uses FETCH FIRST n ROWS ONLY. Always pair it with ORDER BY.

    BeginnerQuick answer1 min read