大约有 45,000 项符合查询结果（耗时：0.0719秒） [XML]
Find all records which have a count of an association greater than zero
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Well that is Rails for you. If you can provide an sql answer (and explain why this isn't efficient), that may be a lot more helpful.
– jvnill
May 7 '19 at 23:17
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Get person's age in Ruby
I'd like to get a person's age from its birthday. now - birthday / 365 doesn't work, because some years have 366 days. I came up with the following code:
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OwinStartup not firing
...uiring these direct references of the Microsoft.Owin stuff? How do we specifically provoke Katana to call Startup.Configuration(IAppBuilder)?
– Jason Kleban
Jan 13 '15 at 16:17
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PostgreSQL database default location on Linux
... server.
The location of the data directory depends on the distribution. If you install from source, the default is /usr/local/pgsql/data:
In file system terms, a database
cluster will be a single directory
under which all data will be stored.
We call this the data directory or
data ar...
What's a good way to overwrite DateTime.Now during testing?
... test, which doesn't feel right. What's the best way to set the date to a known value within the test so that I can test that the result is a known value?
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How to automatically reload a page after a given period of inactivity
How can I automatically reload a webpage, if there have been no activity on the page for a given period of time?
14 Answers...
How do I get the current time zone of MySQL?
Anyone knows if there is such a function in MySQL?
17 Answers
17
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submitting a GET form with query string params and hidden params disappear
... browser retaining any existing query string in the action URL.
As the specifications (RFC1866, page 46; HTML 4.x section 17.13.3) state:
If the method is "get" and the action is an HTTP URI, the user agent takes the value of action, appends a `?' to it, then appends the form data set, encoded usin...
Modulo operation with negative numbers
...mple A. 5/(-3) is -1
=> (-1) * (-3) + 5%(-3) = 5
This can only happen if 5%(-3) is 2.
Example B. (-5)/3 is -1
=> (-1) * 3 + (-5)%3 = -5
This can only happen if (-5)%3 is -2
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Should I store entire objects, or pointers to objects in containers?
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Since people are chiming in on the efficency of using pointers.
If you're considering using a std::vector and if updates are few and you often iterate over your collection and it's a non polymorphic type storing object "copies" will be more efficent since you'll get better locality of ref...