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How to select only 1 row from oracle sql?

I want to use oracle syntax to select only 1 row from table DUAL . For example, I want to execute this query: 13 Answers ...
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How do you add a Dictionary of items into another Dictionary

Arrays in Swift support the += operator to add the contents of one Array to another. Is there an easy way to do that for a dictionary? ...
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Get index of array element faster than O(n)

Given I have a HUGE array, and a value from it. I want to get index of the value in array. Is there any other way, rather then call Array#index to get it? The problem comes from the need of keeping really huge array and calling Array#index enormous amount of times. ...
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Any reason why scala does not explicitly support dependent types?

There are path dependent types and I think it is possible to express almost all the features of such languages as Epigram or Agda in Scala, but I'm wondering why Scala does not support this more explicitly like it does very nicely in other areas (say, DSLs) ? Anything I'm missing like "it is not n...
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Access “this” from Java anonymous class

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Why there can be only one TIMESTAMP column with CURRENT_TIMESTAMP in DEFAULT clause?

Why there can be only one TIMESTAMP column with CURRENT_TIMESTAMP in DEFAULT or ON UPDATE clause? 9 Answers ...
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Random number generation in C++11: how to generate, how does it work? [closed]

I recently came across new way to generate random numbers in C++11, but couldn't digest the papers that I read about it (what is that engine , maths term like distribution , "where all integers produced are equally likely "). ...
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Executing elements inserted with .innerHTML

I've got a script that inserts some content into an element using innerHTML . 20 Answers ...
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Compiler Ambiguous invocation error - anonymous method and method group with Func or Action

I have a scenario where I want to use method group syntax rather than anonymous methods (or lambda syntax) for calling a function. ...
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List comprehension: Returning two (or more) items for each item

Is it possible to return 2 (or more) items for each item in a list comprehension? 6 Answers ...