Question

Can anyone tell me what is wrong with this query below?
from a programming point of view it makes perfect sense but sql does not seem to like it.

SELECT SNAME, YEAR, GPA FROM STUDENT
WHERE (YEAR >= 5 AND GPA <=3.0) AND (WHERE YEAR <=4 AND GPA <= 2.0)
ORDER BY YEAR, GPA DESC ;

I get this error:

Error at line 2
ORA-00936: missing expression

Answer 1

The problem is you are having two WHERE clauses in your query.

Also you should be combining the two boolean expressions using an OR operator rather than an AND, so that the complete expression is true when either of the two is satisfied:

SELECT SNAME, YEAR, GPA 
FROM STUDENT 
WHERE (YEAR >= 5 AND GPA <=3.0) OR (YEAR <=4 AND GPA <= 2.0) 
ORDER BY YEAR, GPA DESC ;