Magic words:
```bash
psql -U postgres
```

Most `\d` commands support additional param of `__schema__.name__` and accept wildcards like `*.*`

- `\q`: Quit/Exit
- `\c __database__`: Connect to a database
- `\d __table__`: Show table definition including triggers
- `\dt *.*`: List tables from all schemas (if `*.*` is omitted will only show SEARCH_PATH ones)
- `\l`: List databases
- `\dn`: List schemas
- `\df`: List functions
- `\dv`: List views
- `\df+ __function` : Show function SQL code. `\x` before pretty-formats it
- `SELECT * FROM pg_proc WHERE proname='__procedurename__'`: List procedure/function
- `SELECT * FROM pg_views WHERE viewname='__viewname__';`: List view (including the definition)
- `SELECT pg_size_pretty(pg_total_relation_size('__table_name__'));`: Show DB table space in use
- `SELECT pg_size_pretty(pg_database_size('__database_name__'));`: Show DB space in use
- `show statement_timeout;`: Show current user's statement timeout
- `SELECT pid, datname, waiting, state, query FROM pg_stat_activity WHERE datname='__database_name__';`: Show queries being executed at a certain DB. Can also display query time, etc.

Casting:
- `CAST (column AS type)` or `column::type`

Constraints:
- `ALTER TABLE my_table ADD CONSTRAINT my_fk FOREIGN KEY (my_field) REFERENCES my_foreign_table ON DELETE CASCADE;`