大约有 5,600 项符合查询结果（耗时：0.0146秒） [XML]
How to find current transaction level?
... SET
ansi_padding SET
ansi_nulls SET
concat_null_yields_null SET
isolation level read committed
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What is the best way to concatenate two vectors?
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AB.reserve( A.size() + B.size() ); // preallocate memory
AB.insert( AB.end(), A.begin(), A.end() );
AB.insert( AB.end(), B.begin(), B.end() );
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What is this Javascript “require”?
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The equivalent in PHP would be include/require[_once] (php.net link), not use, which is an aliasing keyword.
– nevvermind
Apr 2 '19 at 12:39
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PostgreSQL disable more output
...antage that you don't have to remember psql option names, etc.
psql ... | cat
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What is the difference between map and flatMap and a good use case for each?
... Yes - (but note that my informal notation was just meant to indicate a collection of some kind - in fact mapping split over a list of Strings will produce a List of Arrays)
– DNA
Aug 6 '16 at 22:06
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Which are more performant, CTE or temporary tables?
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Only 15 rows of the 1,000,000 randomly generated values match the predicate but the expensive table scan happens 16 times to locate these.
This would be a good candidate for materializing the intermediate result. The equivalent temp table rewrite took 25 seconds.
INSERT INTO #T
SELECT *,
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py2exe - generate single executable file
...allable program.
I have used InnoSetup ( http://www.jrsoftware.org/isinfo.php ) with delight for several years and for commercial programs, so I heartily recommend it.
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Check if a table exists in Rails
... Jan 31 '12 at 14:48
alexey_the_catalexey_the_cat
1,5811616 silver badges2828 bronze badges
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What's the fuss about Haskell? [closed]
...file1).pipe(fs.createWriteStream(file2)). Bash has something similar, too: cat $1 > $2
– Max Heiber
Nov 15 '17 at 1:54
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How to parse XML in Bash?
....com/doc/2006-03-01/">
<Name>sth-items</Name>
<IsTruncated>false</IsTruncated>
<Contents>
<Key>item-apple-iso@2x.png</Key>
<LastModified>2011-07-25T22:23:04.000Z</LastModified>
<ETag>&quot;0032a28286680abee71aed5d05...