大约有 47,000 项符合查询结果（耗时：0.0693秒） [XML]
ALTER TABLE, set null in not null column, PostgreSQL 9.1
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208
ALTER TABLE person ALTER COLUMN phone DROP NOT NULL;
More details in the manual: http://www.p...
how to listen to N channels? (dynamic select statement)
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edited Feb 29 at 11:09
Zac
31744 silver badges1313 bronze badges
answered Nov 15 '13 at 2:37
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Finding row index containing maximum value using R
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170
See ?which.max
> which.max( matrix[,2] )
[1] 2
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Find a Git branch containing changes to a given file
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edited Mar 28 '17 at 1:10
BMW
30.9k99 gold badges7272 silver badges9090 bronze badges
answered Jun 6 '...
document.getElementById vs jQuery $()
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1035
Not exactly!!
document.getElementById('contents'); //returns a HTML DOM Object
var contents ...
Maximum on http header values?
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answered Mar 26 '09 at 15:20
vartecvartec
113k3232 gold badges197197 silver badges234234 bronze badges
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Android and setting alpha for (image) view alpha
...etAlpha(float) whose XML counterpart is android:alpha. It takes a range of 0.0 to 1.0 instead of 0 to 255. Use it e.g. like
<ImageView android:alpha="0.4">
However, the latter in available only since API level 11.
s...
Preserve colouring after piping grep to grep
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edited Feb 25 '10 at 1:38
answered Feb 24 '10 at 15:38
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Ruby on Rails. How do I use the Active Record .build method in a :belongs to relationship?
...nd any documentation on the .build method in Rails (i am currently using 2.0.2).
2 Answers
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How do you grep a file and get the next 5 lines
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Some awk version.
awk '/19:55/{c=5} c-->0'
awk '/19:55/{c=5} c && c--'
When pattern found, set c=5
If c is true, print and decrease number of c
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