problem about multiple-tables-Collection of common programming errors

12 years ago
admin
4 minutes

  • DigitalTrifecta
    sql mysql normalization denormalization multiple-tables
    I have a web application that I am currently working on that uses a MySQL database for the back-end, and I need to know what is better for my situation before I continue any further.Simply put, in this application users will be able to construct their own forms with any number fields (they decide) and right now I have it all stored in a couple tables linked by foreign keys. A friend of mine suggests that to keep things “easy/fast” that I should convert each user’s form to a flat table so that qu

  • las
    c# crystal-reports multiple-tables dynamically-generated
    I am using Access database as datasource. There are two tables in my database . One is Product Table and Invoice table. Invoice table has a productId which is actually Id in the product table. I want to show the product name instead of id dynamicaly according my runtime query. How can i do in c# ? Any one have suggestions Please

  • Gilles
    iphone xcode uitableview datasource multiple-tables
    This question is related to UITableView issue when using separate delegate/dataSource, though I have a different problem. I’m just starting to learn iPhone programming.Basically I have one main view with a table. On the event of a cell click, a sub view with another table is shown.The datasource and delegate for the main view’s table are set as files’ owner, and I have added the necessary code in there to handle the table data and everything is fine. But, when the second table in the sub-view s

  • BinarySolo00100
    mysql join multiple-tables
    I have this query I need to perform where I have to parse through a fields info matching it to another field in another table and then rinse and repeat across several tables, finally this results in the desired rows being returned.The question is, how can I speed this up… it returns hundreds of thousands of rows and it’s not working too well for my client in their admin section as the query is causing a crash.Here is the query:SELECT DISTINCT t1.CU_ship_name1, t1.CU_ship_name2, t1.CU_email FR

  • Sara
    asp.net sql insert multiple-tables
    So I know similar questions have been asked before, but I couldn’t find a clear answer for my specific situation. I’m using ASP.NET (in Visual Web Developer) and I need to insert data from one form into two separate tables. This is my data source:<asp:AccessDataSource ID=”AccessDataSource1″ runat=”server” DataFile=”~/App_Data/courseinfo.mdb” SelectCommand=”SELECT * FROM [tableCourse], [tableFaculty]”InsertCommand=”INSERT INTO [tableCourse] ([department], [name_first], [name_last], [prefix],

  • SethStevenson
    php mysql mysql-error-1064 multiple-tables
    I am attempting to match rows in a mysql table using the values from table1.column1 and table2.column3 and then copy the value from table2.column2 into table1.column1 for each match. The query below does what I need to do, but only when I execute it manually (through phpmyadmin). When I try to execute it from PHP I receive the error Unknown column table1.column1 in ‘field list’. Here is my PHP code:<?php mysql_connect($host,$user,$pass); $db_selected = mysql_select_db($data);$sql = “UPDATE ta

  • woopata
    mysql inner-join multiple-tables
    Is it possible to select multiple tables and make inner join on one of those tables? e.g.SELECT * FROM table1 AS t1, table2 AS t2, table3 AS t3 INNER JOIN table4 AS t4 ON t1.row3 = t4.row3 INNER JOIN table5 AS t5 ON t1.row4 = t5.row4 WHERE …This paricular case is causing me a problem. it gives me an error – Unknown column “t1.row3” in ‘on clause’. I don’t know if it’s possible to select multiple tables but make inner join on one of those tables.

  • Yujun Wu
    ruby-on-rails inheritance multiple-tables
    I followed the post http://techspry.com/ruby_and_rails/multiple-table-inheritance-in-rails-3/ to implement the multiple table inheritance with Rail 4. I have three models: user, applicant and tutor. Here is my code:class User < ActiveRecord::Basebelongs_to :student, :polymorphic => true endclass Tutor < ActiveRecord::Baseacts_as_student endclass Applicant < ActiveRecord::Baseacts_as_student end# in the /lib/student_module.rb module Studentdef acts_as_studentinclude InstanceMethodshas

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