I want to create a many to many relationship, but I want to have in the new table(Mes开发者_C百科sageReceivers) a unique contraint on both columns (AdvanceMessageId,UserId):
is there a data structure, which stores its elements uniquely (for a given compare-Functor) but answers queries for the highest element in that data structure with respect to another compare-Function
I\'m trying to find the unique constraints of a table using Java (on an Oracle Database, but that should make no difference).
The following code string expression = \"(\\\\{[0-9]+\\\\})\"; RegexOptions options = ((RegexOptions.IgnorePatternWhitespace | RegexOptions.Multiline) | RegexOptions.IgnoreCa开发者_开发百科se);
If I make the filename of each uploaded file PHPs microtime(), are the risks of a collision realistic? And is there a way to further randomize the filenames?
I need a simple UUID generator. The ID is required to be unique for this single instance. Another requirement is, that it has n hashes coexisting at a time, and being releasable.
I have a simple table in my SQL Server database. This table contains two columns: ID int, Name nvarchar(50). The ID column is the primary key for my table.
I have browsed the documentation, but开发者_StackOverflow didn\'t find one. Any ideas?You should be able to just apply std::unique to the iterators of QList. std::unique just requires the iterators to
Html element contains complex & unique id, composed from namespace as prefix and incremented index - as postfix.
I need to efficently insert a 5 character RANDOM string into a database while also ensuring that it is UNIQUE.Generating the random string is not the problem, but currently what I am doing is generati
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