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📚 SUM OPERATOR

The SUM function is used in SQL to return the total sum of a numeric column.
It is useful for calculating totals such as total sales, total salaries, or any other cumulative value.

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🛠️ Basic Syntax

SELECT SUM(column_name)
FROM table_name
WHERE condition;

• SUM(column_name) adds together all the values in the specified column.
• Can be combined with GROUP BY to calculate sums for different groups.

Example

SELECT SUM(salary)
FROM employees;

• This query returns the total of all salaries from the employees table.

Key Points

• Only works with numeric columns.
• Ignores NULL values.
• Often paired with GROUP BY to calculate sums across groups.

Additional Example

SELECT department, SUM(salary)
FROM employees
GROUP BY department;

• This query shows the total salary expense for each department.

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🎥 Video Notes

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📝 Problem Description

Describe the problem, challenge, or topic discussed in a video related to SELECT FROM.
What concept was explained or what exercise was solved?

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DataBase Given

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💻 My SQL Code

-- Write your SQL code attempt or solution related to SQL COMMAND
SQL COMMAND

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🧠 Solution Code / Explanation

SQL COMMAND

Explanation - Explain what you learned, any key takeaways, or how you solved the problem related to COMMAND._

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