more testing info/changes

a2/a2.sql

@@ -111,12 +111,13 @@ in a particular term the second also teaches a class for the same course
 in the same term. Report a professor number and name for both the
 professors.
 */
+-- not working, c.deptcode not valid somewhere
 select pnum, pname, pnum2, pname2 from professor, (select pnum as pnum2, pname as pname2 from professor where pnum in
     (
       select pnum from class where deptcode = c.deptcode and cnum = c.cnum and term = c.term and pnum != c.pnum
     )) as subquery where pnum in
 (
-  select pnum, deptcode, cnum, term from class c where exists
+  select c.pnum, c.deptcode, c.cnum, c.term from class c where exists
   (
     select pnum as pnum2, pname as pname2 from professor where pnum in
     (
@@ -133,6 +134,7 @@ course. Also, include only those course numbers for courses with a total
 enrollment count among the three lowest such counts.
 */
 -- Not sure if this will return an error, or 3 rows per old.deptcode, old.cnum since the 3rd parameter (the subquery) has 3 rows
+-- didn't break running on an empty dataset
 select old.deptcode, old.cnum, (select count(*) from enrollment where deptcode = old.deptcode and cnum = old.cnum group by deptcode, cnum order by count(*) asc limit 3) from class old;
 
 /*
@@ -140,7 +142,7 @@ The percentage of professors in pure math who have always taught no
 more than a single course in any given term. (Note that a percentage
 should be a number between 0 and 100.)
 */
-
+-- not liking the formatting
 select (select count(*) from professor p where deptcode = 'PM' and pnum in
 (
   select c.pnum, c.deptcode, c.cnum, c.term, c.section from class c where c.pnum = p.pnum and c.pnum not in
@@ -148,7 +150,7 @@ select (select count(*) from professor p where deptcode = 'PM' and pnum in
     select c1.pnum, c1.deptcode, c1.cnum, c1.term, c1.section from class c1 where pnum = p.pnum and c1.term = c.term and (c1.deptcode != c.deptcode or c1.cnum != c.cnum)
   )
 ))
-/ (select count(*) from professor where deptcode = 'PM') as percentage;
+/ (select count(*) from professor where deptcode = 'PM');
 
 /*
 The number of different third or fourth year students in each section of
@@ -160,6 +162,7 @@ section. (Note that a section is identified by a term and a section number.
 Also assume that sorting by section means sorting by term and then by
 section number. The result will therefore have a total of six columns.)
 */
+-- ran on empty dataset
 select (select pname from professor where pnum = c.pnum), c.pnum, c.cnum, c.term, c.section,
   (select count(distinct snum) from mark where snum in
   (
@@ -198,4 +201,5 @@ with a particular number of classes. For example an output
 indicates that there are 5 courses with a single class (section), 4 courses
 with 2 classes, and 1 course with 5 classes scheduled in the curent term.
 */
+-- ran on empty dataset
 select count(*), count(distinct section) from schedule where term = 1185;

a2/test.sql

@@ -1,2 +1,10 @@
--- db2 -tvmf test.sql is how to run test query
-select count(*), count(distinct section) from schedule where term = 1185;
+-- run this to use test: db2 -tvmf test.sql
+select (select pname from professor where pnum = c.pnum), c.pnum, c.cnum, c.term, c.section,
+  (select count(distinct snum) from mark where snum in
+  (
+    select snum from student where year between 3 and 4
+  ) and deptcode = c.deptcode and cnum = c.cnum and term = c.term and section = c.section)
+from class c where pnum in
+(
+  select pnum from professor where deptcode = 'PM'
+) and term != 1185;