Basic
## Standard SQL Functions

Interactive Course

Learn how to process numerical, text, and other types of data with SQL’s most-used functions.

Introduce yourself to the standard SQL functions used in data processing. This course shows you how to use SQL to work with the following data types:

- Text
- Numeric
- Date and time
- And more

You’ll also learn about:

- Dealing with NULLs in SQL functions
- SQL aggregate functions

You’ll also examine the CASE WHEN expression – a powerful SQL construction that facilitates conditional computations. Finally, the SQL reporting exercises explain how to work with computing ratios and percentages.

Note: This course uses examples written in standard SQL, but not all databases comply with the SQL standard. Some minor modifications may be needed. If that’s the case, we’ll let you know in the exercise instructions. Also, many databases offer non-standard functions that do the same thing as these standard functions. We don’t cover non-standard syntax in this course; your database documentation is a good place to learn about any non-standard syntax.

- A web browser and an Internet connection
- Some understanding of SQL, such as the concepts presented in our SQL Basics course

- Utilize common SQL text functions
- Identify and use standard SQL numeric functions
- Select and implement SQL date and time functions
- Work with NULLs in standard SQL functions
- Understand SQL aggregate functions

Plus, you’ll get to practice your skills on **211 interactive exercises**.

- Anyone who wants to learn about standard SQL functions
- Beginning database analysts
- Beginning developers
- Students taking classes in relational databases
- Business database users who want to improve their skills

The material in Standard SQL Functions is intended for intermediate users. To complete this course, you’ll need to know:

- How to select from a single table, including writing complex WHERE conditions
- How to JOIN tables
- How GROUP BY and HAVING work

*This course is not about user-defined functions*. If you're looking for a course about user-defined functions, see the Writing User-Defined Functions in PostgreSQL course.

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Exercises completed

In this course we assume that you know the basics of SQL: you know how to select information from a single table, you know how to join queries and group by query results. Take the test to find out if you know SQL well enough to follow the course.

Exercises completed

Learn the basic SQL text functions to transform text values and make your reports look pretty.

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Master numeric functions in SQL. Learn about the caveats of mathematical operators in SQL, various rounding functions in SQL and computing proportions in SQL.

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Study date and time functions and learn how to select events from a period of time.

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NULLs are tricky. Learn how to avoid common mistakes with NULL and what SQL functions there are to deal with NULL.

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Deepen your understanding of SQL aggregate functions: COUNT, AVG and SUM. Practice which variant of COUNT or AVG to choose in typical use cases.

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Learn how to include conditions in your SQL queries. Practice computing simple summary reports.

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Check the knowledge of SQL functions in the quiz.

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