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Getting the difference between two sets
...ork but I think it would be a nice feature to have the set operations like union , difference built in java. The above solution will modify the set , in many situations we don't really want that.
– Praveen Kumar
Jul 18 '14 at 8:09
...
Reading 64bit Registry from a 32bit application
...e code I mentioned later (Additional information section), which creates a union query to get registry keys from both nodes in one query - so you can still query them by using their real path.
64 bit registry
To access the 64 bit registry, you can use RegistryView.Registry64 as follows:
string value...
How do I join two lists in Java?
...pache commons-collections library:
List<String> newList = ListUtils.union(list1, list2);
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PHP server on local machine?
...ed for a PHP Server and this simply is a PHP Server. If you want to run a MYSQL Server or PostGres Server then that would be another question and you can configure your PHP Application to use said server. Also for quick development purposes a SQLITE DB should do.
– GardenRout...
What is the best place for storing uploaded images, SQL database or disk file system? [closed]
...
I have recently created a PHP/MySQL app which stores PDFs/Word files in a MySQL table (as big as 40MB per file so far).
Pros:
Uploaded files are replicated to backup server along with everything else, no separate backup strategy is needed (peace of min...
Check for changes to an SQL Server table?
...T CHECKSUM_AGG(BINARY_CHECKSUM(*)) FROM
(
SELECT 1 as numA, 1 as numB
UNION ALL
SELECT 1 as numA, 1 as numB
) q
-- delivers 0!
SELECT CHECKSUM_AGG(BINARY_CHECKSUM(*)) FROM
(
SELECT 1 as numA, 2 as numB
UNION ALL
SELECT 1 as numA, 2 as numB
) q
-- delivers 0!
SELECT CHECKSUM_AGG(BIN...
How to read multiple text files into a single RDD?
...Dirs,320) it leads to 19430 total tasks instead of 320 ... it behaves like union which also leads to insane number of tasks from very low parallelism
– lisak
Nov 25 '15 at 10:51
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How can I add reflection to a C++ application?
...ble with C++.
Inspection by checking whether a class-type (class, struct, union) has a method or nested type, is derived from another particular type.
This kind of thing is possible with C++ using template-tricks. Use boost::type_traits for many things (like checking whether a type is integral). Fo...
What columns generally make good indexes?
...er to use index */
Since "buyer_id" is referenced in the SELECT portion, MySQL will not use it to limit the chosen rows. Hence, there is no great need to index it. The below is another example little different from the above one:
SELECT
buyers.buyer_id, /* no need to index */
country.name /*...
Android应用开发性能优化完全分析 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...导致加载和执行缓慢，所以我们就来看看Lint这个工具是如何发现优化这些问题的（当然了，Lint实际的功能是非常强大的，我们开发中也是经常使用它来发现一些问题的，这里主要有点针对UI性能的说明了，其他的雷同）。
在And...