SQL
Intermediate
SQL Subqueries: Correlated, Scalar, and EXISTS Explained
Master SQL subqueries — scalar, column, table, and correlated subqueries. EXISTS vs IN performance, and when to use CTEs instead.
SQL
Intermediate
MySQL Stored Procedures and Functions: Complete Guide with Examples
Learn MySQL stored procedures and functions — parameters, IF/CASE logic, loops, transactions, and the difference between procedures and functions.
SQL
Intermediate
SQL Window Functions: ROW_NUMBER, RANK, DENSE_RANK, LAG, LEAD Explained
Master SQL window functions — ROW_NUMBER, RANK, DENSE_RANK, LAG, LEAD with PARTITION BY. The most asked advanced SQL topic in data and backend interviews.
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