# lec6

## Lab activity

This lecture features a lab activity in the lab/ directory named: `courses-ddl.sql` with instructions in `simple-joins-lab.pdf`.

* Note: Just make sure to read int courses-ddl.sql first then courses-small.sql second otherwise there will be random errors.(I'm not taking responsibility for that garbage so don't flame me)

## Natural Joins

`Natural Joins`: allows us to join tables while getting rid of duplicate columns automatically.

Form:

```
select columns_[...] from tableLeft natural join tableRight
```
While ther is no need to write extra `where` statements there is also the issue where there may be accidental matches since attributes are dropped.