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How do I perform an IF. . . THEN in an SQL SELECT? - Stack Overflow SELECT IIF(Obsolete = 'N' OR InStock = 'Y', 1, 0) AS Salable, * FROM Product This is effectively just a shorthand (albeit not standard SQL) way of writing CASE I prefer the conciseness when compared with the expanded CASE version Both IIF() and CASE resolve as expressions within a SQL statement and can only be used in well-defined places The CASE expression cannot be used to control the
How to define a bijection between $ (0,1)$ and $ (0,1]$? If you only have to show that such bijection exists, you can use Cantor-Bernstein theorem and $ (0,1)\subseteq (0,1] \subseteq (0,2)$ See also open and closed intervals have the same cardinality at PlanetMath
python - Change column type in pandas - Stack Overflow table = [ ['a', '1 2', '4 2' ], ['b', '70', '0 03'], ['x', '5', '0' ], ] df = pd DataFrame(table) How do I convert the columns to specific types? In this case, I want to convert columns 2 and 3 into floats Is there a way to specify the types while converting the list to DataFrame? Or is it better to create the DataFrame first and then loop through the columns to change the dtype for each
What is $\gcd (0,0)$? - Mathematics Stack Exchange Note that $0$ is the top element in the divisibility order The meet of the top element with itself is itself So $0 = \gcd (0, 0)$ is the answer 'Greatest' is an unfortunate misnomer in this case " The book Mathematics Made Difficult has a nice little section on this It should perhaps better be called "highest common factor" (hcf)
regex - Validating IPv4 addresses with regexp - Stack Overflow I've been trying to get an efficient regex for IPv4 validation, but without much luck It seemed at one point I had had it with (25 [0-5]|2 [0-4] [0-9]| [01]? [0-9] [0-9]? (\ |$)) {4}, but it produces some
The certificate chain was issued by an authority that is not trusted . . . Breaking changes in 4 0 Changed Encrypt connection string property to be true by default The default value of the Encrypt connection setting has been changed from false to true With the growing use of cloud databases and the need to ensure those connections are secure, it's time for this backwards-compatibility-breaking change
algebra precalculus - Zero to the zero power – is $0^0=1 . . . @Arturo: I heartily disagree with your first sentence Here's why: There's the binomial theorem (which you find too weak), and there's power series and polynomials (see also Gadi's answer) For all this, $0^0=1$ is extremely convenient, and I wouldn't know how to do without it In my lectures, I always tell my students that whatever their teachers said in school about $0^0$ being undefined, we