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Facebook database design?
... select friend_id
from friends
where user_id = 1
) union (
select distinct ff.friend_id
from
friends f
join friends ff on ff.user_id = f.friend_id
where f.user_id = 1
)
I really recommend you to create you some sample data...
What is Full Text Search vs LIKE
...ntain the term. Full text search is optimized to compute the intersection, union, etc. of these record sets, and usually provides a ranking algorithm to quantify how strongly a given record matches search keywords.
The SQL LIKE operator can be extremely inefficient. If you apply it to an un-indexed...
Retrieve specific commit from a remote Git repository
...ubmodule pointer).
Only objects reachable from the branch tips, i.e. the union of advertised branches and branches hidden by transfer.hideRefs, will be processed.
Note that there is an associated cost of having to walk back the history to check the reachability.
This feature can be used whe...
Returning an array using C
...
Option 5: Return a union that contains a fixed-size array.
– sqr163
May 18 '17 at 21:47
|
...
Struct inheritance in C++
... important distinction, since for example, only POD structs can be part of unions.
– camh
Jun 11 '09 at 7:00
9
...
what is the unsigned datatype?
...lex
— long double _Complex
— atomic type specifier
— struct or union specifier
— enum specifier
— typedef name
So in case of unsigned int we can either write unsigned or unsigned int, or if we are feeling crazy, int unsigned. The latter since the standard is stupid enough to ...
What are the differences between double-dot “..” and triple-dot “…” in Git diff commit ranges?
...eturns the intersection (white part of the diagram) or the rest of the A-B union (green). It would be more to the point without any set operands and with only 1 color.
– xealits
Jan 30 '18 at 11:41
...
What is the type of lambda when deduced with “auto” in C++11?
...on (which is also the type of the closure object) is a unique, unnamed non-union class type — called the closure type — whose properties are described below. This class type is not an aggregate (8.5.1). The closure type is declared in the smallest block scope, class scope, or namespace scope tha...
What do single quotes do in C++ when used on multiple characters?
...EX) ((x&(0xff<<8*BYTEX))>>(8*BYTEX))
struct Multibyte
{
union{
int val ;
char vals[4];
};
Multibyte() : val(0) { }
Multibyte( int in )
{
vals[0] = MASK(in,3);
vals[1] = MASK(in,2);
vals[2] = MASK(in,1);
vals[3] = MASK(in,0);
}
char operator[]( ...
omp parallel vs. omp parallel for
...worksharing construct
and no other statements. Permitted clauses are the union of the clauses
allowed for the parallel and worksharing contructs.
Taken from http://www.openmp.org/mp-documents/OpenMP3.0-SummarySpec.pdf
The specs for OpenMP are here:
https://openmp.org/specifications/
...