join

LINQ, can’t join to string

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I would suggest doing the string.Join operation locally instead using AsEnumerable: var q = from i in _dbContext.Users where i.UserId != null select new { FirstName = i.FirstName, LastName = i.LastName, Question4Parts = _dbContext.MultipleQuestions .Where(a => a.MultipleQuestionType.KEY == MultipleQuestionKeys.BENEFITS) .Select(a => a.Question) }; return q.AsEnumerable() .Select(x => new ITW2012Mobile.ViewModels.AdminSurveyReportModel { FirstName = x.FirstName, LastName = … Read more

Splitting multiple columns into rows in pandas dataframe

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You can first split columns, create Series by stack and remove whitespaces by strip: s1 = df.value.str.split(‘,’, expand=True).stack().str.strip().reset_index(level=1, drop=True) s2 = df.date.str.split(‘,’, expand=True).stack().str.strip().reset_index(level=1, drop=True) Then concat both Series to df1: df1 = pd.concat([s1,s2], axis=1, keys=[‘value’,’date’]) Remove old columns value and date and join: print (df.drop([‘value’,’date’], axis=1).join(df1).reset_index(drop=True)) ticker account value date 0 aa assets 100 20121231 … Read more

Java: How to use Thread.join

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Use something like this: public void executeMultiThread(int numThreads) throws Exception { List threads = new ArrayList(); for (int i = 0; i < numThreads; i++) { Thread t = new Thread(new Runnable() { public void run() { // do your work } }); // System.out.println(“STARTING: ” + t); t.start(); threads.add(t); } for (int i = … Read more

MySQL: “The SELECT would examine more than MAX_JOIN_SIZE rows”

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When using PHP, SQL_BIG_SELECTS=1 should be set in a separate query before your main query. For example: $mysqli = new mysqli(“localhost”, “root”, “password”, “db”); $mysqli->query(“SET SQL_BIG_SELECTS=1”); //Set it before your main query $results = $mysqli->query(“SELECT a, b, c FROM test”); while($row = $results->fetch_assoc()){ echo ‘<pre>’; print_r ($row); echo ‘</pre>’; }

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