I've just come across this in a WHERE clause: AND NOT (t.id = @id) How does this compare with: AND t.id != @id Or with: AND t.id <> @id I'd always write the latter myself, but clearly someone else thinks differently. Is one going to perform any better than the other? I know that using <> or != is going to bust any hopes for usin...
What is the best method for comparing IEEE floats and doubles for equality? I have heard of several methods, but I wanted to see what the community thought. ...
I'm working on a programming problem which boils down to a set of an equation and inequality: x[0]*a[0] + x[1]*a[1] + ... x[n]*a[n] >= D x[0]*b[0] + x[1]*b[1] + ... x[n]*b[n] = C I want to solve for the values of X that will give the absolute minimum of C, given the input D and lists and A and B consisting of a[0 - n] and b[0 - n ]. ...
I've reduced my problem (table layout algorithm) to the following problem: Imagine I have N variables X1, X2, ..., XN. I also have some (undetermined) number of inequalities, like: X1 >= 2 x2 + X3 >= 13 etc. Each inequalities is a sum of one or more variables, and it is always compared to a constant by using the >= operator. I cannot ...
Perhaps this is a stupid question but we've had some debate recently. Which of the two (semantically equivalent) ways is preferable to test for inequality: 'foo' != 'bar' 'foo' <> 'bar' The mysql documentation clearly indicates that there is no difference between them and yet some people seem to be attached to only doing it one way ...
Its a exercise that ask to indicate the class Big-Theta(g(n)) the functions belongs to and to prove the assertion. In this case f(n) = (n^2+1)^10 By definition f(n) E Big-Theta(g(n)) <=> c1*g(n) < f(n) < c2*g(n), where c1 and c2 are two constants. I know that for this specific f(n) the Big-Theta is g(n^20) but I don't know who to prov...
I'm aware that app engine has the restriction of "Inequality Filters Are Allowed On One Property Only" as described here: http://code.google.com/appengine/docs/python/datastore/queriesandindexes.html#Introducing_Indexes However is there some way to essentially run two filters, or is this simply not possible? For instance, if I had an e...
Unless a class specifically overrides the behavior defined for Object, ReferenceEquals and == do the same thing... compare references. In property setters, I have commonly used the pattern private MyType myProperty; public MyType MyProperty { set { if (myProperty != value) { myProperty = value; ...
A table lists multiple events where each event has four attributes (columns), call them A, B, C, P It would be simpleto pivot to get a table with columns for A, B, C, P=1, P=2, P=3, etc. However, I need the columns to be A, B, C, P<1, P<2, P<3, etc. In other words, if a row of the "simple" way were X, Y, Z, 7, 3, 5, 2 then what I actu...
Could someone explain the meaning of the following portion of code : private event UserChangedHandler m_UserChanged; public event UserChangedHandler UserChanged { add { if (m_UserChanged != value) { m_UserChanged += value; } } } thanks ...