Analytics Academy: Notes
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SQL functions are reusable blocks of code that perform a specific task, taking input parameters and returning a value. They are a powerful tool in SQL, allowing you to simplify complex queries, improve code readability, and reduce maintenance costs.
Types of SQL Functions
Aggregate Functions: Perform calculations on a set of values, such as SUM, AVG, MAX, MIN, and COUNT.
Scalar Functions: Return a single value, based on input parameters, such as UCASE, LCASE, and ROUND.
String Functions: Manipulate string data, such as CONCAT, SUBSTR, and LENGTH.
Date and Time Functions: Perform operations on date and time data, such as NOW, DATE_FORMAT, and TIMESTAMPDIFF
Mathematical Functions: Perform mathematical operations, such as ABS, CEIL, and FLOOR.
Benefits of SQL Functions
Improved Code Readability: SQL functions simplify complex queries
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