Question

I’m trying to write a sql query to the following (from this site http://sqlzoo.net/1b.htm)

In which years was the Physics prize
awarded but no Chemistry prize.
(WARNING – this question is way too
hard for this level, you will need to
use sub queries or joins).

1st try:

with c as
(select yr, subject
from nobel
where subject <> 'Chemistry')

select yr
from c
group by yr
having c.subject ='Physics'

But I get a syntax error:

You have an error in your SQL syntax;
check the manual that corresponds to
your MySQL server version for the
right syntax to use near ‘with c as
(select yr, subject from nobel where
subject <> ‘Chemistry’ at line 1

what’s wrong?

2nd try:

select o.yr
from 
(select yr, subject
from nobel
where subject <> 'Chemistry') o
group by o.yr
having o.subject ='Physics'

But I get a syntax error:

Unknown column ‘o.subject’ in ‘having
clause’

what’s wrong?

3rd try:
how do I do this with JOIN ?

Answer 1

Problem in your first query is having clause. You can only use an aggregation over a column here

so these will work

;with c as 
(select yr, subject from nobel where subject <> 'Chemistry')  
select yr,count(c.subject) from c where c.subject ='Physics'  group by yr 

;with c as 
(select yr, subject from nobel where subject <> 'Chemistry')  
select yr,count(c.subject) from c group by yr  having count(c.subject) =1

same issue with second one

Having in T- SQL