Problem Outputting Data From Second Table Based On ID in FIrst Table

Question

Hi Everyone: I have been stuck for a couple of days on a
couple of issues. Here is one:
I have a COURSES table. I also have a COURSES Summary page
that displays all of the courses and related info.
When a user clicks on a specific course it takes them to a
courses detail page for that specific course. PROBLEM: Everything
is working ok except: I have a separate table that has the teachers
information in it. The two tables are related by The Primary Key
(PERSONNEL_ID) in the Teachers table (Called PERSONNEL_LISTS) and
MT_ID in the COURSES TABLE. I don't want the MT_ID to be displayed
on the details page: I want the teachers first and last name.
Here are the two tables:
http://www.coolflasher.com/Courses_table.gif
http://www.coolflasher.com/Personnel_table.gif
The SQL that is currently being used on the Course Details
page is:
<cfparam name="URL.COURSE_ID" default="-1">
<cfparam name="URL_COURSE_ID"
default="#URL.COURSE_ID#">
<cfparam name="SESSION._Insert_COURSES" default="-1">
<cfquery name="COURSES"
datasource="SCHEDULING_TRACKER">
SELECT *
FROM COURSES
WHERE COURSE_ID = <cfqueryparam value="#URL.COURSE_ID#"
cfsqltype="cf_sql_numeric"> OR ( -1= <cfqueryparam
value="#URL_COURSE_ID#" cfsqltype="cf_sql_numeric"> AND
COURSE_ID=<cfqueryparam value="#SESSION._Insert_COURSES#"
cfsqltype="cf_sql_numeric">)
</cfquery>
And I'm outputting the MT_Code:
<cfoutput>#COURSES.MT_ID#</cfoutput>
I tried adding the PERSONNEL_LISTS table to the query, but I
can't figure out how to get it to output the FIRST_NAME and
LAST_NAME column that correspond with the MT_ID in the COURSES
table.
Courses
Table

Answer 1

Something like this maybe?
(NOTE: you should explicitly list column names from both
tables instead of using *)
<cfquery name="COURSES"
datasource="SCHEDULING_TRACKER">
SELECT t.FIRST_NAME,
t.LAST_NAME,
c.COURSE_NAME,
c.COURSE_ID,
---whatever other fields that you want to select
FROM COURSES AS c
INNER JOIN PERSONNEL_LISTS AS t ON c.MT_ID = t.PERSONNEL_ID
WHERE c.COURSE_ID = <cfqueryparam value="#URL.COURSE_ID#"
cfsqltype="cf_sql_numeric">
OR ( -1 = <cfqueryparam value="#URL_COURSE_ID#"
cfsqltype="cf_sql_numeric">
AND c.COURSE_ID=<cfqueryparam
value="#SESSION._Insert_COURSES#" cfsqltype="cf_sql_numeric">)
</cfquery>
Also, not sure what you are expecting -1 = <cfqueryparam
value="#URL_COURSE_ID#" cfsqltype="cf_sql_numeric"> to do.
Phil