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 table_68563 ( "Round" real, "Pick #" real, "Overall" real, "Name" text, "Position" text, "College" text )

### Question ###
College of san diego state, and a Pick # smaller than 30 is what lowest overall?

### Accurate SQL ###

SELECT MIN("Overall") FROM table_68563 WHERE "College" = 'san diego state' AND "Pick #" < '30'