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_1342198_17 ( first_elected INTEGER, incumbent VARCHAR )

### Question ###
How many results for minimum first elected incumbent Noble Jones Gregory?

### Accurate SQL ###

SELECT MIN(first_elected) FROM table_1342198_17 WHERE incumbent = "Noble Jones Gregory"