大约有 46,000 项符合查询结果（耗时：0.0461秒） [XML]
Unique combination of all elements from two (or more) vectors
...ybe what you are after
> expand.grid(a,b)
Var1 Var2
1 ABC 2012-05-01
2 DEF 2012-05-01
3 GHI 2012-05-01
4 ABC 2012-05-02
5 DEF 2012-05-02
6 GHI 2012-05-02
7 ABC 2012-05-03
8 DEF 2012-05-03
9 GHI 2012-05-03
10 ABC 2012-05-04
11 DEF 2012-05-04
12 GHI 2012-05-04
13 ABC...
Does Ruby have a string.startswith(“abc”) built in method?
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edited Jun 20 at 9:12
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111 silver badge
answered Nov 9 '10 at 4:48
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The 'json' native gem requires installed build tools
...ctions. Finally i got it working. I tried using "DevKit-tdm-32-4.5.2-20110712-1620-sfx.exe" instead of "DevKit-4.5.0-20100819-1536-sfx.exe" and it worked for me. Thanks for all your support Chuck Van.
– sridhar249
Nov 15 '11 at 21:09
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I don't remember my android debug.keystore password
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edited May 23 '17 at 12:26
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answered Sep 17 '12 at 9:34
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How to increment datetime by custom months in python without using library [duplicate]
...onth = sourcedate.month - 1 + months
year = sourcedate.year + month // 12
month = month % 12 + 1
day = min(sourcedate.day, calendar.monthrange(year,month)[1])
return datetime.date(year, month, day)
In use:
>>> somedate = datetime.date.today()
>>> somedate
datetim...
Test if string is a number in Ruby on Rails
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12 Answers
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ALTER TABLE, set null in not null column, PostgreSQL 9.1
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answered Nov 30 '12 at 11:03
a_horse_with_no_namea_horse_with_no_name
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Minimum and maximum date
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edited Jun 20 at 9:12
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111 silver badge
answered Jul 17 '12 at 16:10
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Which rows are returned when using LIMIT with OFFSET in MySQL?
...e query. Then you limit by 18. Which means you consider records 9, 10, 11, 12, 13, 14, 15, 16....24, 25, 26 which are a total of 18 records.
Check this out.
And also the official documentation.
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How to style CSS role
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answered Oct 15 '12 at 9:27
syncsync
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