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 instructor ( name VARCHAR, id VARCHAR, semester VARCHAR )
TABLE: CREATE TABLE teaches ( name VARCHAR, id VARCHAR, semester VARCHAR )

### Question ###
Find the names of instructors who didn't each any courses in any Spring semester.

### Accurate SQL ###

SELECT name FROM instructor WHERE NOT id IN (SELECT id FROM teaches WHERE semester = 'Spring')