Functions in SQL allow you to change how data is presented as part of your query as well as perform aggregations on table data. In this video, explore the concept of SQL functions and the different types of functions that are supported by the Oracle datab
- [Instructor] Functions in SQL allows you to perform manipulations or calculations based on input values. There are several categories of functions in the Oracle SQL language, and we are going to focus on two major categories, these are scalar function and aggregate functions, throughout our course. Let's start with scalar functions. Scalar functions operate on a single value in your table and return a single value as an output.
So for example, using the uppercase function on the first name column in our table will turn the first name into an uppercase variation of the first name. This function will be applied on an individual role level and return a single output per each row. We'll see plenty of examples throughout this chapter. Another category of functions in the Oracle SQL language are aggregate functions, which operates on a group of rows and returns a single value.
So, for example, if we have an employees table that contains the department ID and salary values for each employee and we want to calculate the maximum salary in each department, so using the max aggregate function, but grouping the table via the department ID column, will return a single value for each department just showing the highest salary. We'll see aggregate functions in action later in our course.
Note: This training course is appropriate for beginning database developers with no prior experience with SQL or Oracle.
- Using Oracle SQL*Developer, the free development environment
- Selecting data from tables
- Filtering data
- Using functions to manipulate data
- Joining data from tables
- Creating tables
- Updating values
- Truncating data
- Grouping and ordering result sets
- Working with primary keys
- Checking constraints
Skill Level Beginner
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1. Introduction to SQL
2. Preparing the Course Environment
Downloading the course VM2m 16s
3. Using Oracle SQL Developer
4. Basic SELECT Queries
5. String, Number, and Date Functions
6. Joining Table Data
7. Manipulating Data
8. Grouping Data
9. Advanced Topics
Next steps1m 33s
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