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 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 type 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 Cartesian product of tables.
Self Join - In SQLite self join is used to join the same table.
We will learn more about SQLite Inner Join, Left Outer Join, Cross Join and Self Join in coming chapters.