Aggregate functions help turn large datasets into simple summaries used across many fields. GROUP BY and HAVING allow structured grouping and filtering of data for clearer reports. Functions like ...

SQL is a tool that is widely used in the manipulation of data and featuring in the relational database. They are applied in querying, manipulating as well as reporting data and it is commonly used by ...

Instructions: Use the provided sample database tables (patients, providers, visits, ed_visits, admissions, discharges) to answer the following questions. Write SQL queries to perform grouping and ...

This project is organized to simulate a database environment with optimized query execution. CRUD Operations with B-Trees: Implements basic database operations with B-Trees for effective insertion, ...

I realized how much easier my life would be if SQL had a mode() aggregate function. (I'm using it in the mathematical sense). I'm guessing that either I use SQL in a wierd way or there is a good ...

An aggregate function error in SQL occurs when you try to use an aggregate function in a way unsupported by the SQL language. You may experience the error if you do ...