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Rails: select unique values from a column
..."models"."rating" FROM "models"
This has the advantages of not using sql strings and not instantiating models
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What's the difference between --general-numeric-sort and --numeric-sort options in gnu sort
...eading ‘+’ nor exponential
notation is recognized. To compare
such strings numerically, use the
--general-numeric-sort (-g) option.
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C＋＋模板的特化 - C/C++ - 清泛网 - 专注C/C++及内核技术
... t1, const T t2)
{
return t1 < t2 ? t2 : t1;
}
template <>
const char* mymax(const char* t1,const char* t2)
{
return (strcmp(t1,t2) < 0) ? t2 : t1;
}
但是你不能这么搞：
template <>
bool mymax(const char* t1,const char* t2)
{
return (strcmp(t1,t2) < 0);
}
其实...
JavaScript open in a new window, not tab
...200" which perform opening in a new window. This is simply the fact to put extra parameter (location, status etc.... it doesn't matter)
– Peter
Nov 28 '15 at 11:28
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What's the longest possible worldwide phone number I should consider in SQL varchar(length) for phon
... as the limit ... without formatting. Adding formatting may add roughly an extra character for every digit. So as a final thought it may not be a good idea to limit the phone number in the database in any way and leave shorter limits to the UX designers.
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Python: How to create a unique file name?
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uuid seems to create a long unique string. I dont think its better to have file name with long string and UUID, () in it.
– MysticCodes
Jun 3 '10 at 10:37
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T-SQL: Opposite to string concatenation - how to split string into multiple records [duplicate]
I have seen a couple of questions related to string concatenation in SQL.
I wonder how would you approach the opposite problem: splitting coma delimited string into rows of data:
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What are “connecting characters” in Java identifiers?
...ter.isJavaIdentifierStart(i)) {
System.out.println("character: " + String.valueOf(Character.toChars(i))
+ ", codepoint: " + i + ", hexcode: " + Integer.toHexString(i));
}
}
prints the connecting characters that can be used to start an identifer on jdk1.6.0_45
character...
Maximum filename length in NTFS (Windows XP and Windows Vista)?
...OS and (WIN32DOS - when a filename can be natively a DOS name). (Since the string has a length, it could contain \0 but that would yield to problems and is not in the namespaces above.)
Thus the name of a file or directory can be up to 255 characters. When specifying the full path under Windows, yo...
Getting LaTeX into R Plots
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By approximately, I meant that LaTeX strings are translated into R's plotmath expressions -- which means that if plotmath does not support a specific LaTeX symbol, it will either not be rendered or it will be rendered by combining symbols that are available.
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