What tables are in your database?
You don't have to rely solely on knowing what tables exist. Instead, you can query the pg_catalog.pg_tables to list all of the tables that exist in your database.
Of course, this will list every table, including system tables so ideally, you want to limit your results to the schema where your data resides which in this case is 'public'.
Note: This system table is specific to PostgreSQL but similar tables exist for other databases (see slides).
Deze oefening maakt deel uit van de cursus
Applying SQL to Real-World Problems
Oefeninstructies
- List the tables that exist in your database by querying the table:
pg_catalog.pg_tables. - Filter the query to ensure the result contains entries where the
schemanameis'public'.
Praktische interactieve oefening
Probeer deze oefening eens door deze voorbeeldcode in te vullen.
SELECT *
FROM ___
___;