大约有 4,900 项符合查询结果（耗时：0.0231秒） [XML]
How do I create a unique constraint that also allows nulls?
...onal disk space.
Note that if you don't want an index, you can still save CPU by making the expression be precalculated to disk by adding the keyword PERSISTED to the end of the column expression definition.
In SQL Server 2008 and up, definitely use the filtered solution instead if you possibly ca...
Should I instantiate instance variables on declaration or in the constructor?
...ow it was him). Personal taste is personal taste; ultimately, neither the CPU nor the JRE care about syntactical style.
– Aquarelle
Sep 20 '13 at 22:38
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How do I make UITableViewCell's ImageView a fixed size even when the image is smaller
...This is still the best solution today. Thank you.
– Rémi Belzanti
Aug 20 '15 at 8:10
These days i'd probably recommen...
Set opacity of background image without affecting child elements
...before css pseudo elements hack for IE 7), but IE7 is finally becoming passé.
– thirdender
Aug 31 '13 at 18:34
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How do I automatically update a timestamp in PostgreSQL
... Says so in the Postgres documentation of the types. Varchar has extra CPU cycles to check for the constraint, which doesn't happen on TEXT.
– Rahly
Jun 21 '17 at 15:50
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Staging Deleted files
...bash console, leading to unknown option `deleted)
– Félix Gagnon-Grenier
Feb 15 '16 at 19:05
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How to destroy an object?
...for "speed", but if you want to reclaim memory immediately (at the cost of CPU) should want to use null.
Like others mentioned, setting to null doesn't mean everything is reclaimed, you can have shared memory (uncloned) objects that will prevent destruction of the object. Moreover, like others h...
'POCO' definition
... for better understanding what a POCO looks like.
– Héctor Álvarez
Apr 18 '18 at 14:33
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Extract a dplyr tbl column as a vector
...e actually need to extract the vectors.
– Antoine Lizée
Apr 19 '16 at 3:38
This was the only way I could get a column...
MySQL LIKE IN()?
...05. If more then 5 REGEX, arround 0.0012...
– David Bélanger
Nov 26 '11 at 5:24
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I had an issu...