大约有 40,000 项符合查询结果（耗时：0.0367秒） [XML]
Simple calculations for working with lat/lon and km distance?
...hy;
SET @CurrentLocation = geography::Point(12.822222, 80.222222, 4326)
SELECT * , Round (GeoLocation.STDistance(@CurrentLocation ),0) AS Distance FROM [Landmark]
WHERE GeoLocation.STDistance(@CurrentLocation )<= 2000 -- 2 Km
There should be similar functionality for almost any database out ...
WITH (NOLOCK) vs SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
...rence in certain circumstances.
So use WITH (NOLOCK) if the current data selected is allowed to be incorrect, as it might be rolled back later. This is mostly used when you want to increase performance, and the requirements on your application context allow it to take the risk that inconsistent da...
Simple explanation of MapReduce?
...e reduced to a scalar value.
So if you think of it like a SQL statement
SELECT SUM(salary)
FROM employees
WHERE salary > 1000
GROUP by deptname
We can use map to get our subset of employees with salary > 1000
which map emits to the barrier into group size buckets.
Reduce will sum each of...
Retrieve database or any other file from the Internal Storage using run-as
... procedure below:
search and open device file explorer
Select your handset and then browse to data/data directory
Now find your application package and go to databases folder. You can see the databases there and upon right click, you will get option
to save this in...
What does Ruby have that Python doesn't, and vice versa?
...thods of your choosing. If this would have a name maybe it would be called selective importing?
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edited Jul 11 '09 at 22:00
...
OS detecting makefile
...detected_OS := $(patsubst MINGW%,MSYS,$(detected_OS))
endif
Then you can select the relevant stuff depending on detected_OS:
ifeq ($(detected_OS),Windows)
CFLAGS += -D WIN32
endif
ifeq ($(detected_OS),Darwin) # Mac OS X
CFLAGS += -D OSX
endif
ifeq ($(detected_OS),Linux)
CFLAGS ...
Update multiple columns in SQL
...
The Update table1 set (a,b,c) = (select x,y,x) syntax is an example of the use of
row-value constructors, Oracle supports this, MSSQL does not. (Connect item)
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Make git automatically remove trailing whitespace before committing
...vince Git to treat your changes as a patch:
git add -up .
Hit a+enterto select all changes for each file. You'll get a warning about Git fixing your whitespace errors.
(git -c color.ui=auto diff at this point reveals that your non-indexed changes are exactly the whitespace errors).
Remove the wh...
HashSet versus Dictionary w.r.t searching time to find if an item exists
...value);
}
var testPoints = Enumerable.Repeat(1, TestReps).Select(_ => rand.Next()).ToArray();
var timer = new Stopwatch();
var total = 0;
timer.Restart();
for (int i = 0; i < TestReps; i++)
{
var newKey =...
How to accept Date params in a GET request to Spring MVC Controller?
...User.class).map(UserDto::of);
return userDto;
}
Repository:
@Query("SELECT u from User u where u.validLoginDate < ?1 AND u.invalidLoginDate < ?1 and u.status!='LOCKED'")
List<User> getAllInactiveUsers(Date dateTime);
Cheers!!
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