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Why does NULL = NULL evaluate to false in SQL server
...hould be treated as x = y, where x and y are unbound variables. Now if someone asks you, what is the value of x = y? The only reasonable answer is, "some z". So we have (x = y) = z - or, transcribing it back to SQL, (NULL = NULL) = NULL.
– Pavel Minaev
Dec 4 '0...
Update one MySQL table with values from another
I'm trying to update one MySQL table based on information from another.
2 Answers
2
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Formula to determine brightness of RGB color
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Not correct. Before applying the linear transformation, one must first apply the inverse of the gamma function for the color space. Then after applying the linear function, the gamma function is applied.
– Jive Dadson
Nov 26 '12 at 3:43
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PDO support for multiple queries (PDO_MYSQL, PDO_MYSQLND)
I do know that PDO does not support multiple queries getting executed in one statement. I've been Googleing and found few posts talking about PDO_MYSQL and PDO_MYSQLND.
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Difference Between One-to-Many, Many-to-One and Many-to-Many?
...o how concepts like uni-directional and bi-directional mappings affect the one-to-many/many-to-many relationships. I'm using Hibernate right now so any explanation that's ORM related will be helpful.
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Why are mutable structs “evil”?
...he danger of making a copy of a struct, modifying it, and somehow thinking one is modifying the original (when the fact that one is writing a struct field makes self-apparent the fact that one is only writing one's copy) seems pretty small compared to the danger that someone who holds a class object...
range() for floats
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I don't know a built-in function, but writing one like this shouldn't be too complicated.
def frange(x, y, jump):
while x < y:
yield x
x += jump
As the comments mention, this could produce unpredictable results like:
>>> list(frange(0, 100, 0....
Zero-based month numbering [closed]
...ith 0 and would always be up to the length of elements, excluding the last one.
Also, the use of zero is also popular with pointer arithmetics where you would use one base pointer pointing at some allocated memory, plus a second pointer which would be at an offset from this base pointer. Here, usin...
Interview question: Check if one string is a rotation of other string [closed]
... would object a bit to this as an interview question. It has an "aha!" component, I think. Most programmers (me included) would just use brute force, which is not unreasonable anyway, and that may feel like not "clever" enough to the interviewer.
– Daniel Daranas
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How do I position one image on top of another in HTML?
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When running the code snippet, the one image is not displaying on top of the other one.
– kojow7
Mar 31 '19 at 4:51
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