大约有 2,253 项符合查询结果（耗时：0.0296秒） [XML]
Will strlen be calculated multiple times if used in a loop condition?
...is not a promise not to modify the data pointed to, because it is valid to cast to char* and modify provided that the object modified isn't const and isn't a string literal.
– Steve Jessop
Jul 6 '12 at 15:31
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SQL/mysql - Select distinct/UNIQUE but return all columns?
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@signonsridhar cast your boolean to an int and use sum; e.g. sum(cast(COL as int)) > 0
– Drew
May 8 '18 at 15:17
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How to concatenate text from multiple rows into a single text string in SQL server?
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I had to cast it to NVarchar(max) to get it work.. ``` SELECT STRING_AGG(CAST(EmpName as NVARCHAR(MAX)), ',') FROM EmpTable as t ```
– Varun
17 hours ago
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MySQL/SQL: Group by date only on a Datetime column
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Cast the datetime to a date, then GROUP BY using this syntax:
SELECT SUM(foo), DATE(mydate) FROM a_table GROUP BY DATE(a_table.mydate);
Or you can GROUP BY the alias as @orlandu63 suggested:
SELECT SUM(foo), DATE(mydate) ...
Sorting HashMap by values [duplicate]
..., I ended up with a reversed loop for over .entrySet().toArray(), may be a cast could solve it, I need more time to test :)
– Aquarius Power
Dec 28 '15 at 15:41
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“’” showing on page instead of “ ' ”
...h several SQL queries like this...
UPDATE MyTable SET
MyField1 = CONVERT(CAST(CONVERT(MyField1 USING latin1) AS BINARY) USING utf8),
MyField2 = CONVERT(CAST(CONVERT(MyField2 USING latin1) AS BINARY) USING utf8);
Do this for as many tables/columns as necessary.
You can also fix some of these st...
Why is there no std::stou?
...tee decided to go for such a C-ish approach? Something like boost::lexical_cast<>() seems like a more C++ way of doing things.
– Paul Manta
Jan 3 '12 at 17:27
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Can't find how to use HttpContent
...e content parameter needs to be IHttpContent and not StringContent. When I cast it to the interface it's happy, though.
– micahhoover
May 13 '15 at 1:39
3
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When to use IList and when to use List
...ive the user the richest possible set of operations without them having to cast around. So in that case, if it's a List<T> internally, return a copy as a List<T>.
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Never seen before C++ for loop
...u--; is different from 0, it will be interpreted as true (i.e., implicitly casted to the boolean value true). If, instead, its value is 0, it will be casted to false.
This is very bad code.
Update: I discussed the writing of "for" loops in this blog post. Its recommendations can be summarized in t...