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Why remove unused using directives in C#?
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edited Apr 18 '14 at 19:57
Neil
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Is errno thread-safe?
...vice that can access the
per-thread error number as follows
(ISO/IEC 9945:1-1996, §2.4):
Some functions may provide the error number in a variable accessed
through the symbol errno. The symbol
errno is defined by including the
header , as specified by the
C Standard ... For each th...
What are the differences between “generic” types in C++ and Java?
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145
There is a big difference between them. In C++ you don't have to specify a class or an interfac...
Difference between VARCHAR and TEXT in MySQL [duplicate]
...EXT, but be careful: MEDIUMTEXT stores strings up to 16 MB, LONGTEXT up to 4 GB. If you use LONGTEXT and get the data via PHP (at least if you use mysqli without store_result), you maybe get a memory allocation error, because PHP tries to allocate 4 GB of memory to be sure the whole string can be bu...
ORA-00979 not a group by expression
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234
You must put all columns of the SELECT in the GROUP BY or use functions on them which compress t...
Functions that return a function
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answered Oct 2 '11 at 23:44
kzhkzh
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How do I get epoch time in C#? [duplicate]
...itrov
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How to convert integer to string in C? [duplicate]
...its for int. When using numbers with greater bitsize, e.g. long with most 64-bit compilers, you need to increase the array size—at least 21 characters for 64-bit types.
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Why am I getting “undefined reference to sqrt” error even though I include math.h header? [duplicate
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AbhijitAbhijit
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add a c...
nvarchar和varchar相互转换、联合查询 - ORACLE - 清泛IT论坛，有思想、有深度
本帖最后由 zqp2013 于 2015-2-27 16:42 编辑
场景：联合查询（union all）Oracle两张表，同一组字段的数据类型不一致，分别是nvarchar和varchar。
这时联合查询报错如下：ora12704：字符集不匹配。
解决方法：需要对数据类型进行转换...