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COUNT(*) vs. COUNT(1) vs. COUNT(pk): which is better? [duplicate]

...earing to each other, they are entirely different thing, they just share a common token, i.e. *. An alternate syntax In fact, if it is not permitted to name a field as same as its table name, RDBMS language designer could give COUNT(tableNameHere) the same semantics as COUNT(*). Example: For coun...
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Difference between fold and reduce?

... legitimate reason for these two functions to exist or they are there to accommodate people with different backgrounds? (E.g.: String and string in C#) ...
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How to redirect cin and cout to files?

... Here is an working example of what you want to do. Read the comments to know what each line in the code does. I've tested it on my pc with gcc 4.6.1; it works fine. #include <iostream> #include <fstream> #include <string> void f() { std::string line; while(...
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Server polling with AngularJS

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How can I access “static” class variables within class methods in Python?

...c variables, it's a good idea to read the gotchas from here: stackoverflow.com/questions/68645/… . @Constantin gives one of the many gotchas. – Trevor Boyd Smith Mar 21 '17 at 16:27 ...
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Git: How to edit/reword a merge commit's message?

How do I edit or reword a merge commit's message? 6 Answers 6 ...
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Is it possible to set a number to NaN or infinity?

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Android: How to change CheckBox size?

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How can I get device ID for Admob

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How to count total number of watches on a page?

... searching and the watchers potentially being duplicated in his/her answer/comment. Thanks to Ben2307 for pointing out that the 'body' may need to be changed. Original I did the same thing except I checked the data attribute of the HTML element rather than its class. I ran yours here: http://fl...