MP3 - Storage/Player/SearchEngine
This program act like the famous iTunes software..
The HAVING Clause is always used after the GROUP BY clause, it can not come without the GROUP BY clause. It works the same as the WHERE Clause, it is therefore also used to apply conditions on the aggregate_functions which was impossible by using simple WHERE clause.
The HAVING clause simply contains the conditions to filter data just like in WHERE clause.
SQL HAVING Syntax
A FOREIGN KEY is a key in another table that relates from the PRIMARY KEY in the parent table. A Foreign Key is needed in the related table to connect data from the primary table.
Let's take a look at the following example
Course Table
CourseID | Course |
1 | Math 101 |
2 | English 101 |
Students Table