大约有 4,700 项符合查询结果（耗时：0.0210秒） [XML]
How to remove multiple indexes from a list at the same time? [duplicate]
...or me numpy was the winner (if you have elements that fit in numpy):
7.5 sec for the enumerated list comprehension [4.5 sec on another PC]
0.08 sec for deleting items in reverse order [0.017 (!) sec]
0.009 sec for numpy.delete [0.006 sec]
Here's the code I timed (in the third function conversion...
How to calculate a time difference in C++
...++? I'm timing the execution speed of a program, so I'm interested in milliseconds. Better yet, seconds.milliseconds..
13 A...
How do I find out my MySQL URL, host, port and username?
...----------------+
| root@localhost |
+----------------+
1 row in set (0.41 sec)
In my example above, I was logged in as root from localhost.
To find port number and other interesting settings use this command:
mysql> show variables;
...
Best way to iterate through a Perl array
...read-multi
I get:
Benchmark: running 1, 2, 3, 4, 5, 6 for at least 3 CPU seconds...
1: 3 wallclock secs ( 3.16 usr + 0.00 sys = 3.16 CPU) @ 12560.13/s (n=39690)
2: 3 wallclock secs ( 3.18 usr + 0.00 sys = 3.18 CPU) @ 7828.30/s (n=24894)
3: 3 wallclock secs ( 3.23 ...
Sleep Command in T-SQL?
... command.
E.g.
-- wait for 1 minute
WAITFOR DELAY '00:01'
-- wait for 1 second
WAITFOR DELAY '00:00:01'
This command allows you a high degree of precision but is only accurate within 10ms - 16ms on a typical machine as it relies on GetTickCount. So, for example, the call WAITFOR DELAY '00:00:00...
Why there can be only one TIMESTAMP column with CURRENT_TIMESTAMP in DEFAULT clause?
...reated, stamp_updated) values(null, null);
Query OK, 1 row affected (0.06 sec)
mysql> select * from t5;
+----+---------------------+---------------------+
| id | stamp_created | stamp_updated |
+----+---------------------+---------------------+
| 2 | 2009-04-30 09:44:35 | 2009-04-...
Fastest Way of Inserting in Entity Framework
...: more than 20 minutes
commitCount = 1000, recreateContext = false: 242 sec
commitCount = 10000, recreateContext = false: 202 sec
commitCount = 100000, recreateContext = false: 199 sec
commitCount = 1000000, recreateContext = false: out of memory exception
commitCount = 1, recreateContex...
jQuery first child of “this”
...iven, notif = $('#foo')
jQuery ways:
$(":first-child", notif) - 4,304 ops/sec - fastest
notif.children(":first") - 653 ops/sec - 85% slower
notif.children()[0] - 1,416 ops/sec - 67% slower
Native ways:
JavaScript native' ele.firstChild - 4,934,323 ops/sec (all the above approaches are 100% slower...
What's the fastest way to loop through an array in JavaScript?
...be careful to name the var len differently in the two loops, otherwise the second loop will overwrite the first len.
– Rui Marques
Nov 30 '12 at 13:08
...
Create boolean column in MySQL with false as default value?
...oolean not null default 0
-> );
Query OK, 0 rows affected (0.35 sec)
mysql> insert into mytable () values ();
Query OK, 1 row affected (0.00 sec)
mysql> select * from mytable;
+--------+
| mybool |
+--------+
| 0 |
+--------+
1 row in set (0.00 sec)
FYI: My test was done on...