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What is the “N+1 selects problem” in ORM (Object-Relational Mapping)?
...child records:
INSERT INTO post_comment (post_id, review, id)
VALUES (1, 'Excellent book to understand Java Persistence', 1)
INSERT INTO post_comment (post_id, review, id)
VALUES (2, 'Must-read for Java developers', 2)
INSERT INTO post_comment (post_id, review, id)
VALUES (3, 'Five Stars', 3)
IN...
In practice, what are the main uses for the new “yield from” syntax in Python 3.3?
... lesser-known in Python. Dave Beazley's Curious Course on Coroutines is an excellent start. Read slides 24-33 for a quick primer.
Reading data from a generator using yield from
def reader():
"""A generator that fakes a read from a file, socket, etc."""
for i in range(4):
yield '<...
What is the difference between “JPG” / “JPEG” / “PNG” / “BMP” / “GIF” / “TIFF” Image?
...ally uses this format.
Good for: Nothing really. There isn't anything BMP excels at, or isn't done better by other formats.
GIF - Lossless / Indexed only
GIF uses lossless compression, meaning that you can save the image over and over and never lose any data. The file sizes are much smaller...
C# declare empty string array
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Those curly things are sometimes hard to remember, that's why there's excellent documentation:
// Declare a single-dimensional array
int[] array1 = new int[5];
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How to do two-way filtering in AngularJS?
...the scope to the view. This seems to be a glaring omission in an otherwise excellent library - or am I missing something?
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When to use nil, blank, empty? [duplicate]
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This table is excellent- thanks for sharing!
– BTHarris
Feb 6 '14 at 18:37
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convert '1' to '0001' in JavaScript [duplicate]
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Excellent candidate for my commons4js library
– Danubian Sailor
May 3 '13 at 13:49
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Supervisor socket error issue [closed]
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Excellent man, i got my supervisor running after ages!
– Jaimin
Aug 3 '16 at 12:04
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How to fix Git error: object file is empty?
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Excellent answer, together with all the steps and all. I suppose you saved me from googling each and every one of those!
– Zlatko
Oct 28 '12 at 8:58
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提升大数据分析思想，拥抱大数据未来 - 资讯 - 清泛网 - 专注C/C++及内核技术
...有人甚至认为，科技很快就能让大数据分析变得“像使用Excel一样容易”。在其他如潮水般涌起的革命性数据科学当中，最令人感到兴奋的莫过于能够实时掌握消费者和物联网的动态，但是，这恐怕容易使得企业陷于另一种困境...