JOIN: tying tables together
In relational databases data is split across tables. To get a meaningful answer (e.g. a student’s name and pass type), you temporarily join tables on a shared field—usually PK and FK. That is what JOIN does.
Content is available with subscription.
Get full access to all courses on the platform for one year with a single payment.
▼
Unlike other platforms that charge per course, here you get everything for one price, and after one year of use there will be no automatic charge for the following year.