Here we will learn joins in sqlite with examples and different type of joins (inner join, cross join, full outer join, self join) in sqlite with examples.
In SQLite, joins are used to get result set by combining or joining two or more tables. By using the JOIN clause, we can join multiple tables together and get records based on our requirements.
Suppose in SQLite we have two tables (Employees, Departments) and both tables is having common column called DepartmentId and if we want to get Employee details who are mapped to department then by using Joins in SQLite we can easily get it.
In SQLite, Joins are the best way to combine and get records from multiple tables. Generally, in SQLite each JOIN operator will combine two tables into another table. In case if we have three or more tables then those tables can be joined by using multiple JOIN operators in SQLite statements.
In SQLite, we have different types of JOINS available those are
Inner Join - In SQLite inner joins are used to return only matching records from tables based on the defined conditions.
Outer Join - In SQLite outer joins are used to return records from tables even if defined conditions not satisfying. Generally, we have three types of outer joins available those are Left Outer Joins, Right Outer Joins and Full Outer Joins but SQLite will support only Left Outer Joins.
Cross Join - In SQLite cross joins are used to get the Cartesian product of tables.
Self Join - In SQLite self join is used to join the same table.
In next chapters, we will learn more about SQLite Inner Join, Outer Join, Cross Join and Self Join with examples.