Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE institution (TYPE VARCHAR, founded VARCHAR, enrollment VARCHAR)

### Question ###
Show the institution type with an institution founded after 1990 and an institution with at least 1000 enrollment.

### Accurate SQL ###

SELECT TYPE FROM institution WHERE founded > 1990 AND enrollment >= 1000