Learn whether you can create your own function to provide capability that is not otherwise available in my database management system.
- [Instructor] There may be times where you want a function…that is not provided by your database management system.…Many database management systems provide the ability…to create user-defined function, or UDFs.…Each database system provides its own support for UDFs.…Some systems require you to write your UDFs in C or C++.…Other systems provide their own language.…Many systems provide for UDFs in scripting languages,…including Python, Perl, and even PHP.…
You can use your UDFs for a number of purposes.…You can use it for unit conversions,…like celsius to Fahrenheit, or meters to feet and inches.…You can create format converters,…like seconds to hours, minutes, and seconds.…Or you can use them for aggregations,…like moving averages, or means, or many other use cases.…If you need a function that is not…otherwise provided by your database system,…then it may make sense to create a UDF.…In the next lesson I'll show you some examples…of UDFs for SQLite written in PHP.…
- Understanding SQL terminology and syntax
- Creating new tables
- Inserting and updating data
- Writing basic SQL queries
- Sorting and filtering
- Accessing related tables with JOIN
- Working with strings
- Understanding numeric types
- Using aggregate functions and transactions
- Automating data with triggers
- Creating views
- Defining functions in PHP
Skill Level Beginner
2. SQL Overview
3. Fundamental Concepts
7. Dates and Times
Dates and times1m 52s
11. Views and Subselects
12. Defined Functions
13. A Simple CRUD Application
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