SQL Examples
SQL Aggregate Report
SQL Aggregate Report
Aggregate report with COUNT and SUM uses GROUP BY for summaries.
Understanding SQL Aggregate Functions
SQL aggregate functions allow you to perform calculations on a set of values and return a single value. Common aggregate functions include COUNT, SUM, AVG, MIN, and MAX. These functions are typically used with the GROUP BY clause to create summary reports based on grouped data.
Using COUNT and SUM with GROUP BY
The COUNT function returns the number of rows that match a specified criterion, while the SUM function calculates the total sum of a numeric column. By using these functions with the GROUP BY clause, you can generate meaningful summaries from your data.
For example, consider a sales database where you want to find out how many orders each customer has placed and the total amount they have spent.
Example: Sales Report by Product Category
Let's say you have a table named sales with columns product_id, category, and amount. You want to generate a report that shows the total sales amount for each product category.
Analyzing Employee Performance
In an employee database, you might want to analyze how many projects each employee has completed and the overall hours they've worked. Assume you have an employee_projects table with employee_id and hours_worked columns.
Conclusion
SQL aggregate functions like COUNT and SUM are powerful tools for generating reports and summaries. By using them in conjunction with the GROUP BY clause, you can easily analyze and present data in a meaningful way. Experiment with different combinations to gain insights into your datasets.
SQL Examples
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