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Difference between EXISTS and IN in SQL?
... will tell you whether a query returned any results. e.g.:
SELECT *
FROM Orders o
WHERE EXISTS (
SELECT *
FROM Products p
WHERE p.ProductNumber = o.ProductNumber)
IN is used to compare one value to several, and can use literal values, like this:
SELECT *
FROM Orders
WHERE Produ...
What is the difference between declarative and procedural programming paradigms?
... MXML (part of the Flex framework) is declarative: You tell it what order you want your objects/containers to be displayed, and it handles the layout depending on whether you've told it to lay itself out horizontally or vertically. ActionScript 3 is procedural with support for OOP paradigms.
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How does java do modulus calculations with negative numbers?
...eneral, int result = (-a) % b; gives the right answer when |-a| > b. In order to get the proper result when |-a| < b we should wrap the divisor. int result = ((-a) % b) + b; for negative a or int result = (((-a) % b) + b) % b; for positive or negative a
– Oz Edri
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Where is my .vimrc file?
...mrc
or $VIM/.vimrc
The files are searched in the order specified above and only the first
one that is found is read.
(MacOS counts as Unix for the above.)
Note that the mere existence of a user vimrc will change Vim's behavior by turning off the compatible option. From...
What is Inversion of Control?
...rol is inverted... instead of the computer accepting user input in a fixed order, the user controls the order in which the data is entered, and when the data is saved in the database.
Basically, anything with an event loop, callbacks, or execute triggers falls into this category.
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How to recover stashed uncommitted changes
... index. Try without --index.
You're using git stash save --keep-index in order to test "what will be committed". This one is beyond the scope of this answer; see this other StackOverflow answer instead.
For complicated cases, I recommend starting in a "clean" working directory first, by committ...
Get element type with jQuery
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How do you use version control with Access development?
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To summarize various comments below:
Our Project assumes an .adp-file. In order to get this work with .mdb/.accdb, you have to change OpenAccessProject() to OpenCurrentDatabase(). (Updated to use OpenAccessProject() if it sees a .adp extension, else use OpenCurrentDatabase().)
decompose.vbs:
' ...
How much faster is Redis than mongoDB?
...nt(sys.argv[1])
tests = [mongo_set, mongo_get, redis_set, redis_get] # order of tests is significant here!
do_tests(num, tests)
Results for with mongodb 1.8.1 and redis 2.2.5 and latest pymongo/redis-py:
$ ./cache_benchmark.py 10000
Completed mongo_set: 10000 ops in 1.40 seconds : 7167.6 ...
How do MySQL indexes work?
...index type is the B+Tree based index, that stores the elements in a sorted order. Also, you don't have to access the real table to get the indexed values, which makes your query return way faster.
The "problem" about this index type is that you have to query for the leftmost value to use the index....