hmwrld wrote:
I Say lies, I do not use Cost (*), to some columns, and in some value NULL is possible
For example, Cost (Ni) = 3, Cost (Cu) = 0 and (Ni, Cu columns in one table)
At first, not Cost, and COUNT?
Secondly, did not understand sense of words about different columns - I like told to you;
That NULL and so do not get to result of your request.
And SELECT in which it is caused COUNT, it is logically fulfilled after WHERE