Question

I have a table, mealdb, which has three fields viz. "userid", "timeofday", "daydate"(all varchar2). timeofday can have two values, “noon” or “afternoon”. Now I want to calculate the total number of afternoons against a given userid. I tried like

select sum(timeofday) 
  from mealdb 
 where timeofday='afternoon' where userid='1200';

But it is giving an error in Oracle 10g.

How do I fix this problem?

Answer 1

select count(1) 
  from mealdb 
 where timeofday='afternoon' and userid='1200';