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Dynamics 365 Community / Forums / Microsoft Dynamics AX (Archived) / How can I speed up and...
Microsoft Dynamics AX (Archived)

How can I speed up and simplify query ?

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Posted on by Ireneusz Smaczny 1,535

I have rows in Tab1:

MyName, MyValue, ...
"AAA", 127, ...
"AAA", 127, ...
"AAA", 133, ...
"AAA", 127, ...
"BBB", 400, ...
"BBB", 400, ...

MyName + MyValue have duplicates :-(

I want to count distinct pairs MyName+MyValue This is my query:

    while
    select  MyName, MyValue
    from    Tab1
    group by MyName, MyValue
    where       ....
    {
        counter++;
    }
    //in this example counter = 3

Is it possible to speedup and simplify query ?

*This post is locked for comments

I have the same question (0)
  • KyleLeBarre Profile Picture
    KyleLeBarre 747 on at

    Adding an exists join would help filter out any records that do not have a duplicate record

    eg...

      while

       select  MyName, MyValue

       from    Tab1

       group by MyName, MyValue

       exists join Tab1Exists

       where Tab1Exists.MyName == Tab1.MyName

       && Tab1Exists.MyValue == Tab1.MyValue

       && Tab1Exists.RecId != Tab1.RecId

       where       ....

       {

           counter++;

       }

  • Suggested answer
    dolee Profile Picture
    dolee 11,279 on at

    Hi,

    You can send a TSQL query to get the result in X++ to reduce number of round trips. Create a new class and add the following method:

    public static server void Main(Args _args)

    {

       Connection  connection;

       Statement   statement;

       str         sql;

       ResultSet   resultSet;

       SqlStatementExecutePermission   perm;

       sql =  "SELECT COUNT(*) as [NumOfCombinations] FROM " +

               "( " +

               "select MyName, MyValue " +

               "from tab1 " +

               strFmt("where DATAAREAID = '%1' ",curext()) +

               "group by MyName, MyValue" +

               ") a";

       connection = new connection();

       perm = new SqlStatementExecutePermission(sql);

       perm.assert();

       statement = connection.createStatement();

       resultSet = statement.executeQuery(sql);

       while (resultSet.next())

       {

           info(strFmt("Total number of combinations: %1", resultSet.getInt(1)));

       }

       CodeAccessPermission::revertAssert();

    }

    And of cause you can just run the SQL in SSMS to get the result. :)

    Regards,

    Dominic

  • Dick Wenning Profile Picture
    Dick Wenning 8,705 Moderator on at

    add an index on the group by column values

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