大约有 42,000 项符合查询结果(耗时:0.0255秒) [XML]

https://stackoverflow.com/ques... 

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...
https://stackoverflow.com/ques... 

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...
https://stackoverflow.com/ques... 

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 ...
https://stackoverflow.com/ques... 

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...
https://stackoverflow.com/ques... 

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 /*...
https://stackoverflow.com/ques... 

Making heatmap from pandas DataFrame

...sinstance(index, pd.DatetimeIndex): idx = pd.DatetimeIndex(middle).union([start,end]) elif isinstance(index, (pd.Float64Index,pd.RangeIndex,pd.Int64Index)): idx = pd.Float64Index(middle).union([start,end]) else: print('Warning: guessing what to do with index type %s' ...
https://stackoverflow.com/ques... 

Why use the SQL Server 2008 geography data type?

...dbo.Geo SELECT geography::Point(12.3456789012345, 12.3456789012345, 4326) UNION ALL SELECT geography::Point(87.6543210987654, 87.6543210987654, 4326) GO 10000 INSERT dbo.LatLng SELECT 12.3456789012345, 12.3456789012345 UNION SELECT 87.6543210987654, 87.6543210987654 GO 10000 EXEC sp_spaceuse...
https://stackoverflow.com/ques... 

Detecting endianness programmatically in a C++ program

...punning - it will often be warned against by compiler. That's exactly what unions are for ! bool is_big_endian(void) { union { uint32_t i; char c[4]; } bint = {0x01020304}; return bint.c[0] == 1; } The principle is equivalent to the type case as suggested by others, ...
https://stackoverflow.com/ques... 

How to report an error from a SQL Server user-defined function

...rom foo where ID = @aID --error checking code is embedded within this union --when the ID exists, this second selection is empty due to where clause at end --when ID doesn't exist, invalid cast with case statement conditionally causes an error --case statement is very hack-y, but th...
https://www.tsingfun.com/it/tech/897.html 

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...