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_name_36 (clock_speed__mhz_ INTEGER, introduced VARCHAR)

### Question ###
With April 1986 as the introduced, what is the least clock speed (MHz)?

### Accurate SQL ###

SELECT MIN(clock_speed__mhz_) FROM table_name_36 WHERE introduced = "april 1986"