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How to implement a many-to-many relationship in PostgreSQL?
...llow NULL values, functions and joins can introduce NULL values in queries etc.
Read the chapter on CREATE TABLE in the manual.
Primary keys are implemented with a unique index on the key columns, that makes queries with conditions on the PK column(s) fast. However, the sequence of key columns is ...
Git branch strategy for small dev team [closed]
... conflicts twice.
I have added steps to always test after a merge and to 'fetch and merge" or 'pull --rebase" a lot (once in the morning and in the afternoon) while developing features. We also used github.com as the central place to pull the latest code.
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static allocation in java - heap, stack and permanent generation
... they are given enough memory space to store the return type of the method,etc.
That is inaccurate (or at least, you are not expressing yourself clearly).
If some method accesses a static member variable, what it gets is either a primitive value or an object reference. This may be assigned to an...
Cannot change column used in a foreign key constraint
...the referencing table structure. Innodb has int as internal type, smallint etc are shortcuts only
– Michel Feldheim
May 20 '18 at 7:10
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sho...
How to find and return a duplicate value in array
...r, O(n), but now needs to manage multiple lines-of-code, needs test cases, etc.
If you need an even faster solution, maybe try C instead.
And here is the gist comparing different solutions: https://gist.github.com/naveed-ahmad/8f0b926ffccf5fbd206a1cc58ce9743e
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What is the difference between pip and conda?
...thon, neglecting non-Python library dependencies, such as HDF5, MKL, LLVM, etc., which do not have a setup.py in their source code and also do not install files into Python’s site-packages directory.
So Conda is a packaging tool and installer that aims to do more than what pip does; handle libra...
How do I decode HTML entities in Swift?
...t 4
String extension computed variable
Without extra guard, do, catch, etc...
Returns the original strings if decoding fails
extension String {
var htmlDecoded: String {
let decoded = try? NSAttributedString(data: Data(utf8), options: [
.documentType: NSAttributedStri...
Generating Random Passwords
...the generated password (e.g. digits only, only uppercase or only lowercase etc.)
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Purpose of ESI & EDI registers?
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In addition to the string operations (MOVS/INS/STOS/CMPS/SCASB/W/D/Q etc.) mentioned in the other answers, I wanted to add that there are also more "modern" x86 assembly instructions that implicitly use at least EDI/RDI:
The SSE2 MASKMOVDQU (and the upcoming AVX VMASKMOVDQU) instruction sele...
B-Tree vs Hash Table
...lso tree algorithms are usually easier to maintain, grow with data, scale, etc.
Hash indexes work with pre-defined hash sizes, so you end up with some "buckets" where the objects are stored in. These objects are looped over again to really find the right one inside this partition.
So if you have sma...