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Database development mistakes made by application developers [closed]
...r primary keys?
What's the best practice for primary keys in tables?
Which format of primary key would you use in this situation.
Surrogate vs. natural/business keys
Should I have a dedicated primary key field?
This is a somewhat controversial topic on which you won't get universal agreement. Whi...
How to programmatically empty browser cache?
...-cache'>
You might also want to consider turning off auto-complete on form fields, although I'm afraid there's a standard way to do it (see this question).
Regardless, I would like to point out that if you are working with sensitive data you should be using SSL. If you aren't using SSL, anyone...
How to change the order of DataFrame columns?
... first line of code, and re-arrange as desired. The only other piece of information to know is that without a header, the default column names are integers, not strings.
– daniel brandstetter
Sep 9 '19 at 23:27
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Meaning of -
... the xml documentation. Document Type Declaration is not required for well formed xml.
– xvan
Nov 15 '16 at 12:18
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What is the difference between include and require in Ruby?
...y inheritance. class C; include M end makes M the superclass of C and the (former) superclass of C the superclass of M. I don't think that C's include works via inheritance, I think it is simple textual/lexical substitution.
– Jörg W Mittag
May 21 '17 at 8:08...
.Net picking wrong referenced assembly version
... You solved a related problem for me - thanks! An inherited form in my C# application wouldn't open in the designer because it was looking for an old version of a reference. Turns out another reference had originally been built while referencing that old version of the problem refere...
“Comparison method violates its general contract!”
...consistent value when comparing objects. For example, you might want to perform a string compare and force empty strings to sort to the end with:
if ( one.length() == 0 ) {
return 1; // empty string sorts last
}
if ( two.length() == 0 ) {
return -1; // emp...
Differences between INDEX, PRIMARY, UNIQUE, FULLTEXT in MySQL?
...allow them to be looked up more efficiently.
fulltext: a more specialized form of indexing that allows full text search. Think of it as (essentially) creating an "index" for each "word" in the specified column.
share
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Iterate two Lists or Arrays with one ForEach statement in C#
...
You can use Union or Concat, the former removes duplicates, the later doesn't
foreach (var item in List1.Union(List1))
{
//TODO: Real code goes here
}
foreach (var item in List1.Concat(List1))
{
//TODO: Real code goes here
}
...
What is the reason behind “non-static method cannot be referenced from a static context”? [duplicate
...stance methods are the logic, instance fields are the data. Together, they form an object.
public class Foo
{
private String foo;
public Foo(String foo){ this.foo = foo; }
public getFoo(){ return this.foo; }
public static void main(String[] args){
System.out.println( getFoo...