<s>[INST] How many types of sql joins does mysql supports? [/INST] MySQL supports 3 basic types of JOIN clauses:

1. `INNER JOIN`: Returns rows with matching values in both tables.
2. `CROSS JOIN`: Returns all rows from both tables.
3. `OUTER JOIN`: Returns both matching rows *and* non-matching rows. In case there are non-matching rows in a joined table, their NULL values will be shown. There are two types of outer joins in MySQL: `LEFT JOIN`, which returns all records from the left table, and the matched records from the right table, and `RIGHT JOIN`, which returns all records from the right table, and the matched records from the left table.</s>\ <s>[INST] what join types do postgresql support? [/INST] PostgreSQL supports these types of JOIN clauses: INNER JOIN, OUTER JOIN, LEFT OUTER JOIN, RIGHT OUTER JOIN, FULL OUTER JOIN, SEMI JOIN, and NATURAL JOIN.</s>