Impala Joins: Types Explained

Impala has support for multiple types of connection operations, including:

1. Inner Join: Only returns rows that satisfy the connection criteria between the two tables.
2. Left Join: Returns all rows from the left table, plus the rows from the right table that satisfy the join condition with the left table.
3. Right Join: Returns all rows from the right table and only the rows from the left table that meet the join condition with the right table.
4. Full Outer Join: Returns all rows from both the left and right tables, regardless of whether they meet the join condition.
5. Cross join: returns the Cartesian product of two tables, meaning each row from the left table is combined with every row from the right table.

In addition to the mentioned types of joins, Impala also supports self joins and multi-table joins for connecting tables and querying data as needed.