This is a curated details on SQL aggregation functions along with sample queries demonstrating their usage. Aggregation functions are crucial for summarizing and analyzing data in relational databases ...

Window functions in SQL operate on a defined subset of ... and return a single value that summarizes them. For example, you can use aggregate functions to calculate the sum, average, count ...

Basic Query Operations (Filtering, Sorting, Grouping) Aggregate Functions (SUM, COUNT, MAX, MIN) Window Functions (RANK, DENSE_RANK, LEAD, LAG) Joins (INNER, LEFT ...

The error “Column is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause” occurs in SQL when a SELECT ...