大约有 40,000 项符合查询结果（耗时：0.0349秒） [XML]
ALTER TABLE to add a composite primary key
...dexed from left to right.
For example, consider the following queries:
A) SELECT person, place, thing FROM provider WHERE person = 'foo' AND thing = 'bar';
B) SELECT person, place, thing FROM provider WHERE person = 'foo' AND place = 'baz';
C) SELECT person, place, thing FROM provider WHERE person ...
SVN command to delete all locally missing files
...TortoiseSVN, just do a Check for Modifications, sort by the Status column, select all the entries marked missing, right-click to open the context menu, and select Delete. Finally, commit to publish the changes to the repository.
If you are on Windows, but prefer the command-line and enjoy dabbling ...
Is modern C++ becoming more prevalent? [closed]
...p; Moo's Accelerated C++ and Stroustrup's new textbook. So we don't learn char* then std::strings.
It's an interesting lesson in how long it takes for "legacy" methods to be replaced, especially when they have a track record of effectiveness.
...
What and where are the stack and heap?
...ate a lot of data.
Responsible for memory leaks.
Example:
int foo()
{
char *pBuffer; //<--nothing allocated yet (excluding the pointer itself, which is allocated here on the stack).
bool b = true; // Allocated on the stack.
if(b)
{
//Create 500 bytes on the stack
char buffer[50...
How to split one string into multiple strings separated by at least one space in bash shell?
...[*] [a] [*]. Only use it if you are 101% sure that there are no SHELL metacharacters in the splitted string!
– Tino
May 13 '15 at 10:03
4
...
Idiomatic way to convert an InputStream to a String in Scala
...ery safe as it uses getLines(); what if the input stream has no "new line" characters? then the whole thing blocks
– Paul Sabou
Mar 17 '13 at 12:11
...
Format output string, right alignment
... @Mark One way the old way is cleaner is that it uses fewer characters. Yes with familiarity the new way becomes intuitive but it is not cleaner and simpler. The old way is more intuitive for those who are accustomed to the syntax that comes to us through the venerable C language, a l...
how to schedule a job for sql query to run daily?
...QL Server Agent node and right click the Jobs node in SQL Server Agent and select 'New Job'
In the 'New Job' window enter the name of the job and a description on the 'General' tab.
Select 'Steps' on the left hand side of the window and click 'New' at the bottom.
In the 'Steps' window enter a step n...
What is __init__.py for?
...ll fail.
The __init__.py file is usually empty, but can be used to export selected portions of the package under more convenient name, hold convenience functions, etc.
Given the example above, the contents of the init module can be accessed as
import spam
based on this
...
Improve INSERT-per-second performance of SQLite
...ple threads (connection per-thread).
First find the items, in the table:
SELECT COUNT(*) FROM table
then read in pages (LIMIT/OFFSET):
SELECT * FROM table ORDER BY _ROWID_ LIMIT <limit> OFFSET <offset>
where and are calculated per-thread, like this:
int limit = (count + n_threa...