Mathematical Explanation of the Difference between SQL Joins: Inner ...
May 5, 2020 · Question What is a mathematically sound & intuitive explanation of all the inner and outer SQL joins that clearly shows the differences between them? Inner Join Left Join Right Join Full …
geometry - Writing SQL code to recognize when three input lengths …
May 29, 2018 · Writing SQL code to recognize when three input lengths form a triangle Ask Question Asked 7 years, 6 months ago Modified 4 years, 7 months ago
Is Cartesian Product same as SQL Full Outer Join?
Feb 8, 2014 · Is Cartesian Product same as Full Outer Join found in Relational Database SQL? I ask because I am taking a Discrete Mathematics course and I just want a better understanding of how …
Difference between PEMDAS and BODMAS. - Mathematics Stack …
Dec 21, 2022 · You shouldn't think of either rule as setting different priorities for multiplication and division, or for addition and subtraction. You need to work left to right for these. PEMDAS = …
Why is $1/i$ equal to $-i$? - Mathematics Stack Exchange
May 11, 2015 · There are multiple ways of writing out a given complex number, or a number in general. Usually we reduce things to the "simplest" terms for display -- saying $0$ is a lot cleaner than saying …
Counterintuitive examples in probability - Mathematics Stack Exchange
Feb 12, 2017 · I want to teach a short course in probability, and I am looking for some counterintuitive examples in probability. I am mainly interested in the problems whose results seem to be obviously …
Explanation for the Wilson Score Interval? - Mathematics Stack Exchange
Mar 19, 2014 · The explanation of "interval equality principle" was impossible for me to readily understand. However, it is not needed to know why the Wilson score interval works. The Wilson …
Is $\\cos(x^2)$ the same as $\\cos^2(x)$? - Mathematics Stack Exchange
I want to know something about trigonometrical functions, is $\\cos(x^2)$ the same as $\\cos^2(x)$ ?
The mod97 operation in IBAN validation - Mathematics Stack Exchange
The international bank account number (IBAN) is validated by a $\bmod 97$ operation. Suppose an account number is like sd1234abcd78965h then the following steps are performed: the first four …
Sum of averages vs average of sums - Mathematics Stack Exchange
Jan 12, 2014 · I have essentially a table of numbers -- a time series of measurements. Each row in the table has 5 values for the 5 different categories, and a sum row for the total of all categories. If I take...