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_36968 ( "Frequency (kHz)" real, "Call letters" text, "Licensed location" text, "Type" text, "Format" text )

### Question ###
What is the smallest frequency (kHz) that is in the location of Longview?

### Accurate SQL ###

SELECT MIN("Frequency (kHz)") FROM table_36968 WHERE "Licensed location" = 'longview'