大约有 38,000 项符合查询结果（耗时：0.0563秒） [XML]
MySQL DISTINCT on a GROUP_CONCAT()
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edited Jun 21 '10 at 9:47
Daniel Vassallo
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Python strptime() and timezones?
...n't match EST and others
– jfs
Sep 29 '14 at 12:11
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express 4.0 , express-session with odd warning message
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answered Jun 29 '14 at 14:36
mscdexmscdex
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Update all values of a column to lowercase
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edited Oct 5 '18 at 8:29
answered May 28 '11 at 9:53
Rip...
Mongoose query where value is not null
...true) ?
– Steve K
Nov 24 '14 at 10:39
@SirBenBenji something like where("myArraySubDoc.0.someValue").ne(true)
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Border in shape xml
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edited Jun 17 '19 at 12:44
Christian
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Why can't decimal numbers be represented exactly in binary?
...ting point number is for exactly the same reason. You can represent 3, and 9, and 27 exactly - but not 1/3, 1/9 or 1/27.
The problem is that 3 is a prime number which isn't a factor of 10. That's not an issue when you want to multiply a number by 3: you can always multiply by an integer without runn...
How to execute IN() SQL queries with Spring's JDBCTemplate effectivly?
... stivlo
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answered Aug 25 '09 at 9:54
yawnyawn
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String literals and escape characters in postgresql
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Note that on PostgreSQL 9.0 E'testing\\x20double-slash' will evaluate as 'testing\\x20double-slash', so only single-slash approach works for E'string' style literals
– Alexander
Aug 14 '12 at 14:02
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Convert a matrix to a 1 dimensional array
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[1,] 1 4 7 10
[2,] 2 5 8 11
[3,] 3 6 9 12
> as.vector(m)
[1] 1 2 3 4 5 6 7 8 9 10 11 12
> as.vector(t(m))
[1] 1 4 7 10 2 5 8 11 3 6 9 12
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