大约有 4,700 项符合查询结果（耗时：0.0235秒） [XML]
Include headers when using SELECT INTO OUTFILE?
...most blindly on my dev server... Without column headers, it takes about 50 seconds to dump 240million lines. With this UNION ALL, the server is getting into big troubles trying to do a temporary table before dumping everything, it has been over 10 minutes now and still waiting for the temporary tabl...
How to sort an array in Bash
... @MarkH It's necessary because sorted=() is not a command but rather a second variable assignment.
– antak
Sep 26 '16 at 4:01
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How can I use goto in Javascript?
... term that was popularized by Paul Irish, while discussing this script and PHP’s decision to add goto into their language.
And for those who do not immediately recognize that this entire thing is a joke, please forgive me. <—(insurance).
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How to convert Milliseconds to “X mins, x seconds” in Java?
... time elapsed using a human readable format such as "XX hours, XX mins, XX seconds" or even "XX mins, XX seconds" because its not likely to take someone an hour.
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How to sort a list of objects based on an attribute of the objects?
... if there is a need to sort by multiple fields, it could be achieved by consecutive calls to sort(), because python is using stable sort algorithm.
– zzz777
Feb 23 at 14:41
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Check if a given key already exists in a dictionary
...t on this... On half a million keys, if key in d1 took 0.17265701293945312 seconds. Calling if key in d1.keys() took 0.23871088027954102 -- this is the classic definition of a micro-optimization. Saving 0.07884883880615234 seconds is not a performance boost.
– Charles Addis
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Practical non-image based CAPTCHA approaches?
... That one is great. The link to the site is random.irb.hr/signup.php. Sometimes it's a lot easier
– Marcio Aguiar
Sep 11 '08 at 8:45
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How to get current timestamp in milliseconds since 1970 just the way Java gets
... can use System.currentTimeMillis() to get the current timestamp in Milliseconds since epoch time which is -
6 Answers
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Are the days of passing const std::string & as a parameter over?
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variable by reference: 1000000000 iterations -> time elapsed: 2.25912 sec
variable by value: 1000000000 iterations -> time elapsed: 27.2259 sec
literal by reference: 100000000 iterations -> time elapsed: 9.10319 sec
literal by value: 100000000 iterations -> time elapsed: 8.62659 sec
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MySql : Grant read only options?
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1 row in set (0.00 sec)
Changing 'not_leet' and 'localhost' to match the new user you want to add, along with the password, will result in a reusable GRANT statement to create a new user.
Of, if you want a single operation to set up and gran...