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Get top 1 row of each group

... @domanokz: no, it's not a subquery. If you have correct indexes then millions shouldn't be a problem. There are only 2 set based ways anyway: this and the aggregate (Ariel's solution). So try them both... – gbn Jul 27 '11 at 9:30 ...
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What is more efficient: Dictionary TryGetValue or ContainsKey+Item?

...hink that TryGetValue is still more efficient since the get and set of the indexer property is used, isn't it? – Tim Schmelter Oct 1 '15 at 10:44 ...
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Static hosting on Amazon S3 - DNS Configuration

... your content to the s3 bucket. Choose a consistent name for your website index files (index.html usually). You can also upload a custom page for 404 Not Found errors. Call this 404.html. Give Read permissions to every file in your website so that the public can view it. Don't give any extra per...
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How can I calculate the number of lines changed between two commits in git?

... as well (without parameters it compares the working directory against the index). E.g. git diff --stat HEAD^ HEAD to compare the parent of HEAD with HEAD. share | improve this answer |...
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Is it possible only to declare a variable without assigning any value in Python?

...ng* with value here #we can just start using it right inside the loop for index in sequence: if conditionMet: value = index break try: doSomething(value) except NameError: print "Didn't find anything" It's a little difficult to tell if that's really the right style to us...
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jQuery SVG, why can't I addClass?

...elieve is the best approach: // addClass $('path').attr('class', function(index, classNames) { return classNames + ' class-name'; }); // removeClass $('path').attr('class', function(index, classNames) { return classNames.replace('class-name', ''); }); ...
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How can I break up this long line in Python?

...because it's thumbnail was " "already in our system as {1}.".format(line[indexes['url']], video.title)) share | improve this answer | follow | ...
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Pass array to ajax request in $.ajax() [duplicate]

...o[1] = 'hello'; $.ajax({ type: "POST", data: {info:info}, url: "index.php", success: function(msg){ $('.answer').html(msg); } }); share | improve this answer | ...
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What are the differences between B trees and B+ trees?

...needed in a B/B+ tree in a database context? Since it's primarily used for indexing, searches would barely ever need to scan the entire tree right and instead traverse via the index path, is that correct? – Siddhartha Aug 25 '17 at 0:31 ...
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Where is Java's Array indexOf?

...rted and is not an array of primitives: java.util.Arrays.asList(theArray).indexOf(o) If the array is primitives and not sorted, one should use a solution offered by one of the other answers such as Kerem Baydoğan's, Andrew McKinlay's or Mishax's. The above code will compile even if theArray is ...