--- title: "SQL Functions: Types, Syntax & Examples | OWOX" canonical: "https://www.owox.com/glossary/sql-function" updated: "2026-10-26" --- # What is a SQL function? SQL functions are built-in routines used to perform operations on data in a database. **2 min** read · Updated July 21, 2025 · [Data Modeling](/blog/topics/data-modeling) SQL functions help automate calculations, format values, and simplify data queries. SQL functions make it easier to analyze, transform, and retrieve meaningful information from datasets. These functions are widely used in reporting, dashboards, and decision-making workflows. ## **Importance of SQL functions** SQL functions streamline everyday tasks like calculating totals, formatting text, or extracting dates. They save time, reduce errors, and simplify queries, especially for teams working with large or complex datasets. For marketers and analysts, these functions are crucial for creating KPIs, segmenting users, and comparing trends without writing complex logic repeatedly. SQL functions also play a key role in building reusable data models and improving performance by keeping queries efficient. ## **Types of SQL functions** There are two main types of SQL functions: aggregate and scalar.  * **Aggregate functions** return a single value from a group of rows, such as SUM(), AVG(), COUNT(), MIN(), and MAX(). They’re often used in reporting and summary views.  * **Scalar functions** return a single value for each row and include functions like UPPER(), LOWER(), ROUND(), and GETDATE(). Some SQL platforms also offer user-defined functions (UDFs), allowing teams to create custom logic for repeated use. Unlike stored procedures, functions return a value and are used inside queries, making them ideal for reusable logic in SELECT statements. ## The Turning Point OWOX Data Marts See your first report built in real time. _15 minutes._ 1. Connect your data warehouse 2. Pick your metrics 3. Get a live Google Sheets report In the time it takes to write a ticket. Then imagine never writing that ticket again. [Book a Demo](/book-a-call) We'll use your actual use case ## **Common examples of SQL functions** SQL functions are used in everyday data tasks to simplify reporting and make queries more useful. Here are some of the most common ones, along with brief descriptions: * **SUM()**: Adds up numeric values; useful for calculating total revenue or cost. * **COUNT()**: Counts how many rows meet a condition; ideal for measuring record volume. * **AVG()**: Calculates the average of values; often used in campaign performance. * **UPPER()**: Converts text to uppercase; helps standardize names or codes. * **LOWER()**: Converts text to lowercase; useful for data matching and filtering. * **NOW() / GETDATE()**: Returns the current timestamp; useful for tracking activity time. * **ROUND()**: Rounds numbers to a defined precision; used for clean output in reports. ## **Best practices for writing SQL functions** When used properly, SQL functions improve readability and reliability. Here are a few key tips: * **Start simple**: Break complex calculations into smaller function blocks. * **Handle NULLs**: Always check how each function deals with missing values. * **Use aliases**: Rename output columns for clarity when applying functions. * **Avoid over-nesting**: Too many functions inside each other hurt readability and speed. * **Test incrementally**: Try functions on small data slices before scaling up. Understanding how to apply SQL functions effectively helps analysts and marketers work more independently. It reduces reliance on engineers for basic data transformations and speeds up reporting. These functions also support building more maintainable data models and consistent analysis logic across teams, especially when tied into centralized reporting layers or data marts. ## Send recurring numbers as Insights [Insights with AI Assistance](/features/ai-insights) turn saved SQL queries over a Data Mart into a scheduled write-up. Write the text once, add the queries (your own, or drafted by the AI Assistant and applied by you), and OWOX sends the result to Email, Slack, Microsoft Teams or Google Chat on the schedule you set. Every figure comes from a saved query, so you can check it. ## Topics [Glossary](/glossary) [Data Modeling](/blog/topics/data-modeling) ## Related terms [What is SQL? Definition & Key Concepts](/glossary/what-is-sql) [What is a Dataset? Definition & Examples](/glossary/dataset) [Database](/glossary/database) [What is a Query? SQL Definition & Examples](/glossary/what-is-query) [Abstraction in Data Modeling](/glossary/abstraction-in-data-modeling) [ACID Compliance](/glossary/acid-compliance) ## Related articles ## Learn more about analytics [bigquery · BigQuery SQL style and best practices: a short, tested standard · Oct 16, 2026](/blog/articles/bigquery-code-standards-best-practices) [bigquery · BigQuery string functions: syntax and tested examples · Oct 6, 2026](/blog/articles/string-functions-bigquery) [bigquery · BigQuery date functions: syntax, examples and common errors · Oct 6, 2026](/blog/articles/bigquery-date-functions) ## Your New Normal Turn your data into decisions. Governed data marts give you the clean foundation ML needs to actually work. * No AI hallucinations * Analyst-governed definitions * Every number traces to SQL [Get started free](https://www.owox.com/app-signup) ## Book a call You are booked. The invitation is on its way to , with the calendar invite and the meeting link. 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