# lec13

## Lab Exercises

This lecture has a lab portion in `lab/` directory.
Directions are on `index-structures-lab.pdf` and `ordered-indexes-lab.pdf`.

## Indexing

We create an index based on some field, where we sort the entries in this index table.
Each entry then contains a pointer to each record in the target table.
Sorting the indexes allows us to search them _much faster_ than we could ever do on disk.

> What about collision?

Then we simply add a pointer to the index's list of associated pointers.

It's important to note that indexes are tables, just like everything else in sql.