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Searching sub table, SQL

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    Searching sub table, SQL

    Hi,

    I have a grid where I want to search a sub table but can't fgure out how to solve it:
    • Two tables, "Adults" and "Children".
    • The relationship between the tables is that some of the "Adults" will have one or many "Children"
    • By default the grid returns a list of all Adults.
    • I want to be able to search on a child's name but the grid should still return the parent details. So I could theoretically search on "Adam" and I would get a list of all parents with a child named "Adam".


    I have tried with the group_concat feature so I get one field with all children names in the same grid, but I can't make a search in a group_concat expression without getting an SQL error.

    Anyone who could guide me in the right direction?

    Thanks
    Robert

    #2
    Re: Searching sub table, SQL

    have you tried left outer join?(left table being adults)
    thanks for reading

    gandhi

    version 11 3381 - 4096
    mysql backend
    http://www.alphawebprogramming.blogspot.com
    [email protected]
    Skype:[email protected]
    1 914 924 5171

    Comment


      #3
      Re: Searching sub table, SQL

      THanks for the suggestion. Unfortunately it does not work as the default list would return multiple parents if they have several children (one record per child instead of one record per parent). The original search and result should always return only one record per parent, but the search will be done in multiple child records.

      Robert

      Comment


        #4
        Re: Searching sub table, SQL

        Ok, just had a small break but need some further guidance. The following query works just as I want:

        SELECT parents.idParent, parent.name, GROUP_CONCAT(children.name) AS ChildName
        FROM parents parents
        LEFT OUTER JOIN children children
        ON parents.idParent = children.parentID
        GROUP BY parents.idParent
        HAVING ChildName LIKE '%John%'

        The problem is that I need to perform a "HAVING" query instead of a "WHERE" query, otherwise I will get an SQL error. Is there any way I can tell alpha to use "HAVING" istead of "WHERE" when doing a search?

        Thanks!

        Comment


          #5
          Re: Searching sub table, SQL

          Robert

          Do you have portable SQL selected?
          Al Buchholz
          Bookwood Systems, LTD
          Weekly QReportBuilder Webinars Thursday 1 pm CST

          Occam's Razor - KISS
          Normalize till it hurts - De-normalize till it works.
          Advice offered and questions asked in the spirit of learning how to fish is better than someone giving you a fish.
          When we triage a problem it is much easier to read sample systems than to read a mind.
          "Make it as simple as possible, but not simpler."
          Albert Einstein

          http://www.iadn.com/images/media/iadn_member.png

          Comment


            #6
            Re: Searching sub table, SQL

            i am not clear on this issue, so just for me to understand:
            you have a grid and a search part
            and if you search on a child's name that should return all the parents who have a child with that name correct?
            if so, left outer join will do just fine.
            you just hide the grid part when no search is active. so you don't see the entire list which will be every single line for the parents who have multiple children.
            unless there is a requirement that the grid be shown regardless of the search then it is going to very very difficult to convert a normalized table to a de-normalized one.
            above words copied from al's signature.(thanks al)
            thanks for reading

            gandhi

            version 11 3381 - 4096
            mysql backend
            http://www.alphawebprogramming.blogspot.com
            [email protected]
            Skype:[email protected]
            1 914 924 5171

            Comment


              #7
              Re: Searching sub table, SQL

              Originally posted by GGandhi View Post
              above words copied from al's signature.(thanks al)
              No problem. I wish I could say it was an original statement from me. Not quite.

              I do think the issue is whether Robert is using portable SQL or native SQL.

              Portable SQL is limited while native SQL says 'You know what you are doing, go for it. I won't help or interfere.'......
              Al Buchholz
              Bookwood Systems, LTD
              Weekly QReportBuilder Webinars Thursday 1 pm CST

              Occam's Razor - KISS
              Normalize till it hurts - De-normalize till it works.
              Advice offered and questions asked in the spirit of learning how to fish is better than someone giving you a fish.
              When we triage a problem it is much easier to read sample systems than to read a mind.
              "Make it as simple as possible, but not simpler."
              Albert Einstein

              http://www.iadn.com/images/media/iadn_member.png

              Comment


                #8
                Re: Searching sub table, SQL

                I do think the issue is whether Robert is using portable SQL or native SQL
                I don't think so.
                if you join two tables the result is multiple parent records whether you use native or portable.
                thanks for reading

                gandhi

                version 11 3381 - 4096
                mysql backend
                http://www.alphawebprogramming.blogspot.com
                [email protected]
                Skype:[email protected]
                1 914 924 5171

                Comment


                  #9
                  Re: Searching sub table, SQL

                  Originally posted by eskimoavenue View Post
                  Ok, just had a small break but need some further guidance. The following query works just as I want:

                  SELECT parents.idParent, parent.name, GROUP_CONCAT(children.name) AS ChildName
                  FROM parents parents
                  LEFT OUTER JOIN children children
                  ON parents.idParent = children.parentID
                  GROUP BY parents.idParent
                  HAVING ChildName LIKE '%John%'

                  The problem is that I need to perform a "HAVING" query instead of a "WHERE" query, otherwise I will get an SQL error. Is there any way I can tell alpha to use "HAVING" istead of "WHERE" when doing a search?

                  Thanks!
                  Originally posted by GGandhi View Post
                  I don't think so.
                  if you join two tables the result is multiple parent records whether you use native or portable.
                  I'm basing my reply on the bolded line.

                  Looks like a syntax issue that portable SQL won't allow.

                  (not that I've ever been wrong....)
                  Al Buchholz
                  Bookwood Systems, LTD
                  Weekly QReportBuilder Webinars Thursday 1 pm CST

                  Occam's Razor - KISS
                  Normalize till it hurts - De-normalize till it works.
                  Advice offered and questions asked in the spirit of learning how to fish is better than someone giving you a fish.
                  When we triage a problem it is much easier to read sample systems than to read a mind.
                  "Make it as simple as possible, but not simpler."
                  Albert Einstein

                  http://www.iadn.com/images/media/iadn_member.png

                  Comment


                    #10
                    Re: Searching sub table, SQL

                    Hi,

                    Thanks for your feedback!!!

                    unless there is a requirement that the grid be shown regardless of the search then it is going to very very difficult to convert a normalized table to a de-normalized one.
                    Yes, this is a requirement, but the query is correct and gives me exacly what I want. The query mentioned gives me a result like:

                    Name ChildName
                    Donald Huey,Dewey,Louie
                    Bruce Lee Brandon Lee
                    The "Name" comes from the parent table and "ChildName" is a comma separated list of a column in the child table. This is created by the group_concat SQL function mentioned above and I use it all the time.

                    The problem is that I want to search in the "ChildName" column. Searching is possible if I use a "HAVING" query, like:
                    HAVING ChildName LIKE '%John%'

                    The problem is that alpha five uses a "WHERE" clause when doing searches which returns an error:
                    WHERE ChildName LIKE '%John%'

                    My question is if there is any way to tell Alpha to use the "having" function instead of "where" function. This is just in a specific grid so not globally.

                    Thanks again!
                    Robert

                    Comment


                      #11
                      Re: Searching sub table, SQL

                      Robert,

                      If the grid is not for update then u can define a view for
                      SELECT parents.idParent, parent.name, GROUP_CONCAT(children.name) AS ChildName
                      FROM parents parents
                      LEFT OUTER JOIN children children
                      ON parents.idParent = children.parentID
                      GROUP BY parents.idParent

                      And base the grid on the view.

                      Comment


                        #12
                        Re: Searching sub table, SQL

                        Thanks, that is an exact copy of my SQL query above and it works perfectly ;)

                        The problem is doing a search inside of that query. I can't use a WHERE syntax which alpha uses as you can't use a WHERE syntax for group-concat in SQL, it has to be a HAVING syntax as mentioned above. So the grid works just fine, it is the search within the grid that does not work in Alpha. The SQL syntax above does however work but I need to get aopha to use that syntax.

                        Thanks again.
                        Robert

                        Comment


                          #13
                          Re: Searching sub table, SQL

                          Robert

                          Please show an image of where you are entering the query into Alpha.
                          Al Buchholz
                          Bookwood Systems, LTD
                          Weekly QReportBuilder Webinars Thursday 1 pm CST

                          Occam's Razor - KISS
                          Normalize till it hurts - De-normalize till it works.
                          Advice offered and questions asked in the spirit of learning how to fish is better than someone giving you a fish.
                          When we triage a problem it is much easier to read sample systems than to read a mind.
                          "Make it as simple as possible, but not simpler."
                          Albert Einstein

                          http://www.iadn.com/images/media/iadn_member.png

                          Comment


                            #14
                            Re: Searching sub table, SQL

                            Thanks for your attention to this Al!

                            The alpha five component is a grid.
                            The query is entered into the SQL Genie as text. The query works just fine and I can render the grid as expected.

                            Query used:
                            Code:
                            SELECT parents.idParent, parent.name, GROUP_CONCAT(children.name) AS ChildName
                            FROM parents parents
                            LEFT OUTER JOIN children children
                            ON parents.idParent = children.parentID 
                            GROUP BY parents.idParent
                            The grid renders like this:
                            Name ChildName
                            Donald Huey,Dewey,Louie
                            Bruce Lee Brandon Lee
                            The "name" column is based on the parents table, the "ChildName" is actually several records from the child table, listed as a comma separated list. There can be one value or several depending on how many child records there are (as in the example above). This is done by the group_concat part of the query.

                            So the above works just fine, no problems at all. Now to the problem: I want to search in the "ChildName" column.

                            I can search in the child column by using a syntax like:
                            HAVING ChildName LIKE '%John%'

                            This works just fine if I write the query myself. But if I want to use a standard search field in Alpha it uses the syntax:
                            WHERE ChildName LIKE '%John%'
                            This syntax is not recognised by SQL if the original SQL query contains a group_concat syntax. So I bassically want to tell alpha to search by "having" and not by "where" and all would be ok.

                            Maybe it is just too much to ask from ALpha's grids, I could probably write a function instead that just rerenders the whole grid with a new query as the following actually works:

                            Code:
                            SELECT parents.idParent, parent.name, GROUP_CONCAT(children.name) AS ChildName
                            FROM parents parents
                            LEFT OUTER JOIN children children
                            ON parents.idParent = children.parentID 
                            GROUP BY parents.idParent
                            [B]HAVING ChildName LIKE '%John%' [/B]
                            I will try doing this if no one has got any suggestions. Thanks again everyone for your time and efforts in trying to understand me!

                            Regards
                            Robert

                            Comment


                              #15
                              Re: Searching sub table, SQL

                              I'm thinking you need to look at one of the events like an after search is pressed which will allow you to modify the SQL prior to it actually executing
                              Al Buchholz
                              Bookwood Systems, LTD
                              Weekly QReportBuilder Webinars Thursday 1 pm CST

                              Occam's Razor - KISS
                              Normalize till it hurts - De-normalize till it works.
                              Advice offered and questions asked in the spirit of learning how to fish is better than someone giving you a fish.
                              When we triage a problem it is much easier to read sample systems than to read a mind.
                              "Make it as simple as possible, but not simpler."
                              Albert Einstein

                              http://www.iadn.com/images/media/iadn_member.png

                              Comment

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