This post covers some important concepts related to databases Key concepts Schema Refinements (Normalization) Functional dependency Normal Forms Minimal Cover or Irreducible set of FDs
What are Aggregate and Scalar Functions available in SQL?
Aggregate and Scalar functions are in built function for counting and calculations. Aggregate functions operate against a group of values but returns only one value. AVG(column):- Returns the average value of a column COUNT(column):- Returns the number of rows (without a NULL value) of a column COUNT(*):- Returns the number of selected rows MAX(column):- Returns the highest value of a …