Learn how to use the HAVING clause to filter.
- [Narrator] The having clause in a sequel query…allows us to filter records based on…summarized group by results.…Having, when use as part of the sequel query,…applies to the summarized group records,…where as using where applies to individual records.…Let's see the having clause in action.…We'll start by typing a query that will show us…the average salary per department from our employees table.…I'll type select average salary comma department id…from employees group by department id.…
Executing this query will provide us with…the average salary per department.…To make things nicer to view,…let's nest the average function inside a round function.…There we go.…Let's say that you only want to see departments…where the average salary is greater than $9,000.…For example, we want to exclude departments such as…30 or 50, where the average salary is lower than $9,000.…I cannot do this using a where clause…because where applies to individual records…and not to grouped results.…
However, by typing having after the group by clause…
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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