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How to find gaps in sequential numbering in mysql?

...> t1.id) as gap_ends_at FROM arrc_vouchers t1 WHERE NOT EXISTS (SELECT t2.id FROM arrc_vouchers t2 WHERE t2.id = t1.id + 1) HAVING gap_ends_at IS NOT NULL gap_starts_at - first id in current gap gap_ends_at - last id in current gap ...
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Singleton: How should it be used

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ssl_error_rx_record_too_long and Apache SSL [closed]

... 172 The link mentioned by Subimage was right on the money for me. It suggested changing the virtual...
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Determine the number of lines within a text file

...d be an issue (if you try and find the number of lines in a 4GB file on a 32-bit system, for example, where there simply isn't enough user-mode address space to allocate an array this large). In terms of speed I wouldn't expect there to be a lot in it. It's possible that ReadAllLines has some inter...
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How to use XPath in Python?

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Overwrite or override

... answered Dec 28 '11 at 3:35 Aurelio De RosaAurelio De Rosa 20k88 gold badges4444 silver badges6868 bronze badges ...
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C++ compiling on Windows and Linux: ifdef switch [duplicate]

... use: #ifdef __linux__ //linux code goes here #elif _WIN32 // windows code goes here #else #endif share | improve this answer | follow ...
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Untrack files from git temporarily

... 742 git update-index should do what you want This will tell git you want to start ignoring the chan...
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Lambda expression to convert array/List of String to array/List of Integers

...like this: //for lists List<String> stringList = Arrays.asList("1","2","3"); List<Integer> integerList = convertList(stringList, s -> Integer.parseInt(s)); //for arrays String[] stringArr = {"1","2","3"}; Double[] doubleArr = convertArray(stringArr, Double::parseDouble, Double[]::ne...
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ScalaTest in sbt: is there a way to run a single test without tags?

... 205 This is now supported (since ScalaTest 2.1.3) within interactive mode: testOnly *MySuite -- ...