大约有 49,000 项符合查询结果（耗时：0.2649秒） [XML]
Find all records which have a count of an association greater than zero
... an example
[10] pry(main)> Comment.distinct.pluck :article_id
=> [43, 34, 45, 55, 17, 19, 1, 3, 4, 18, 44, 5, 13, 22, 16, 6, 53]
[11] pry(main)> _.size
=> 17
[12] pry(main)> Article.joins(:comments).size
=> 45
[13] pry(main)> Article.joins(:comments).distinct.size
=> 17
[14...
How to change time and timezone in iPhone simulator?
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Jayprakash Dubey
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answered Nov 9 '09 at 8:11
nduplessisndup...
display: inline-block extra margin [duplicate]
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edited Jan 23 '13 at 10:48
ᴍᴀᴛᴛ ʙᴀᴋᴇʀ
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Ignore parent padding
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answered Nov 28 '10 at 11:39
SamSam
4,79277 gold badges2727 silver badges5454 bronze badges
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No module named MySQLdb
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653
You need to use one of the following commands. Which one depends on what OS and software you hav...
DateTime2 vs DateTime in SQL Server
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edited Jul 13 '18 at 19:20
Evan Carroll
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Cryptic “Script Error.” reported in Javascript in Chrome and Firefox
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13 Answers
13
Active
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Make a borderless form movable?
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253
This article on CodeProject details a technique. Is basically boils down to:
public const int W...
How to overwrite styling in Twitter Bootstrap
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answered Nov 10 '11 at 19:37
motoxer4533motoxer4533
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MySQL - why not index every field?
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123
Indexes take up space in memory (RAM); Too many or too large of indexes and the DB is going to h...