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EasyQuery.NET

HAVING and GROUP BY clauses in generated query

  1. When a user inserts some aggregate column into the query - EasyQuery automatically adds GROUP BY clause into the result SQL statement. To add an aggregate column - just insert a column into QueryColumnsPanel as usual, then click on the button near the newly added column and select “Aggregate” in the menu that appears.

  2. To add HAVING clause into the resulting query you can do the following:

  • Add special virtual attribute into your data model with expression “Max(TableName.ExamDate)”.
  • Mark this new attribute as “Aggregate”.
  • Assign to this attribute some operators (equals, less than, more than, etc.).
  • Save your model.

Now when user add some condition with this new attribute - the condition will go into HAVING clause in the result SQL statement;