大约有 6,700 项符合查询结果（耗时：0.0320秒） [XML]
Referring to a Column Alias in a WHERE Clause
...onment to see if your specific table/query is adversely affected with this vs. calling out the formula specifically in the where clause. I suspect you will not notice a difference.
– Adam Wenger
Jul 4 '14 at 17:17
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Rails find record with zero has_many records associated [duplicate]
... that particular case. I'm not sure what the efficiency is of doing a join vs doing an includes, though
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How to access environment variable values?
... @endolith, the correct question woud be "HOME" in os.environ vs os.environ.get('HOME') is None. As you can see first is far more readable & comfortable to work with.
– Konstantin Sekeresh
Oct 16 '19 at 13:43
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What is a “cache-friendly” code?
... people in the field sometimes forget is column-major (ex. fortran,matlab) vs. row-major ordering (ex. c,c++) for storing two dimensional arrays. For example, consider the following matrix:
1 2
3 4
In row-major ordering, this is stored in memory as 1 2 3 4; in column-major ordering, this would be s...
Convert UTC date time to local date time
...rmatted string as shown above. msdn.microsoft.com/en-us/library/zdtaw1bw(v=vs.110).aspx In javascript it's new Date().toISOString(). developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
– Hulvej
Aug 4 '15 at 18:29
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Remove DEFINER clause from MySQL Dumps
...here is related question: dba.stackexchange.com/questions/118846/mysqldump-vs-mysqlpump
– Scadge
Dec 8 '17 at 14:09
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Python speed testing - Time Difference - milliseconds
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In the first example above, you are shown a time of 0.05 for time.clock() vs 0.06377 for time.time()
>>> start = time.clock(); time.sleep(1) ; print "process time: " + (time.clock() - start)
process time: 0.0
>>> start = time.time(); time.sleep(1) ; print "process time: " + (time...
Scala how can I count the number of occurrences in a list
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@ohruunuruus this ought to be an answer (vs comment); i would love to enthusiastically upvote, if it were (and select it as the best answer if i were the OP);
– doug
Feb 13 '15 at 4:01
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Entity Framework Refresh context?
...com/en-us/library/system.data.entity.infrastructure.dbentityentry.reload(v=vs.113).aspx#M:System.Data.Entity.Infrastructure.DbEntityEntry.Reload
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Why is there no Tree class in .NET?
...om a Tree Data Stucture.
http://msdn.microsoft.com/en-us/library/f7fta44c(VS.80).aspx
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