What is a join and explain different types of joins. Joins are used in queries to explain how different tables are related.
Joins also let you select data from a table depending upon data from another table.
Types of joins: INNER JOINs, OUTER JOINs, CROSS JOINs.
OUTER JOINs are further classified as LEFT OUTER JOINS, RIGHT OUTER JOINS and FULL OUTER JOINS.
What are different Types of Join?A join is typically used to combine results of two tables. A Join in SQL can be:-
- Inner joins
- Outer Joins
- Left outer joins
- Right outer joins
- Full outer joins
- Inner join
An inner join looks for matching records taken from one table from another.
A left outer join limits results to the table in left of JOIN.
A right outer join limits results to the table in right of JOIN.
Full outer joins are the combination of left and right outer joins