join

Rails Foreign Key Issue

Sorry if this question seems simple, I am very very new to Rails (just started learning a few days ago), but after consulting Google and "Agile Web Development with Rails" I can't find the answer. I have an issue with Rails 2.3.8 creating a foreign key on two models. My tables look like this: cars manuf...

MySQL join multiple columns from same table

Hi all I am trying to write a query that returns a users profile information, along with a count of occurrences of the user's ID in 2 columns from another table. An example below: TableA userID userName 1 UserA 2 UserB TableB LinkID leadID followID 1 1 2 2 1 3 3 2 1 Querying against...

Return 1 result per left join

Currently I am performing a left join on two tables. The first table has an id and a persons name, the second table has an id, the id of a person from table 1, and then a timestamp (of the last flight they had). People Flights id | name id | person_id | time ------------ -----...

Poor MySQL Join Performance

I've been trying to perform a join on two tables in MySQL, and the query will run for a minute or two before I run out of memory without getting results. I'm far from a database expert, so I'm not sure if I'm writing my queries poorly, if I have some MySQL settings poorly configured, or if I really should be doing something else entirel...

Simplifying this query?

Consider this query: SELECT table1.id, table1.review, table1.time, table2.author, table2.title FROM table1, table2 WHERE table1.id = table2.id AND table1.reviewer = '{$username}' ORDER BY table1.id I'm using the above quite a lot around my site's code. I find that adding the table prefixes etc. befo...

CakePHP: COUNT function and model joining help

Hi, I'm trying to join tables to get a count on a field but am having trouble figuring out how to do it. here are my tables: tags id INT tag VARCHAR project_tags id INT project_id INT tag_id INT projects id INT ... I want show in my view something like this: [tags.tag] x 23 [tags.tag] x 12 ... Now I'm no S...

Return 1 result per left join

Currently I am performing a left join on two tables. The first table has an id and a persons name, the second table has an id, the id of a person from table 1, and then a timestamp (of a flight). People Flights id | name id | person_id | time ------------ ---------------------...

SQL Server 2008 Update Query with Join and Where clause in joined table

Hi All, not sure why this is not working.. UPDATE ust SET ust.isUnsubscribedFromSystemEmails = 1 FROM UserSetting AS ust INNER JOIN [User] ON ust.userID = [User].userID AND [User].emailAddress IN (SELECT emailAddress FROM BadEmailAddresses) In plain English, I am trying to set the isUnsubscribed fiel...

Cross-checking one MySQL table of text content against another table of keywords

Let's say I have two tables: Table 1 has the columns NOTE_ID (a unique key) and NOTE_BODY (a big text blurb). Table 2 has the columns KEYWORD_ID (a unique key) and KEYWORD (a keyword). I want to get a result set that tells me which keywords each NOTE_BODY contains, without nesting a bunch of loops. So ideally I would get a row for ea...

Is there a "not equal" in a linq join

I am trying accomplish the LINQ query below but I need a "not equal" instead of equal, so that filteredEmployees has all employees from groupA minus groupB. List<Employee> groupA = getEmployeeA(); List<Employee> groupB = getEmployeeB(); var filteredEmployees = from a in groupA join b in groupB on a.Nam...

delete with join in Zend-Framework

This're my tables: To update a document I need to delete all functions. What is the best approach to do this in ZendFramework? Is there a solution using delete and join? ...

SQL Query direct or inner join

i want to find a number of clients from certain dates before and after there was a status changes in their credit history. eg: date = 2010/07/25 date2 = 2010/08/30 i want everyone from the table who had a status "pending" before "date" and from the same lists of people, i want to identify lists of clients whose status changed from "p...

Help me work out how to build my SQL for this JOIN scenario

I'm still trying to learn SQL as of this writing, so I'm a bit shakey at the moment. My situation is like this: I have a table called 'Tasks' with an auto-incrementing primary key ID and a text field (and a few others that aren't relevant to this problem, too). I have another table called 'Locations' with a foreign key referring to a ...

How to do an outer join with count based column?

Hi, What can be an efficient way for the following problem in SQL 2008? First two are input tables, using which I need to populate the 3rd(DataOut table) Basically, WDATA will have zero or more rows corresponding to each row of DataIn table. I need to populate DataOut table with all the rows, including none matched and multiple matche...

Dynamic JOIN condition on a Table

I want to avoid string concatenation to create dynamic SQL query in SQL 2008. How can I achieve the below functionality, if at all, efficiently ? A table stores the various conditions a user had chosen to search DB by using one or more values to search tables from. For e.g. he can give SSN or DOB or both SSN and DOB. So if he gives mu...

Update Table with a "Select query" with a where clause

I want to Achieve the following: Current State of table (my_table) id totalX totalY totalZ --------- -------------- -------------- -------------- 9 34 334 0 10 6 56 ...

Access 2K SQL OUTER JOIN using Derived Tables (i.e. subselect/subquery)

First, I am a noob, just trying to learn some Access/VBA/SQL, but I have been stumped by this issue. Shown below are the (9) tbl JOIN relations. This lists X records for each game_ID (X = number of players in game). I only want one record per game_ID where [game_players.player_ID] is a selected/special player (say, HERO ) [game_playe...

Help with querying a many to many table in mysql

I am trying to get a list of product id's that do not have certain colors (database is mysql) Here are my tables: product +------------+-------------+ | product_id | description | +------------+-------------+ | 1 | Widget 1 | | 2 | Widget 2 | | 3 | Widget 3 | | 4 | Widget 4 | | 5...

codeigniter multiple join conditions on same table

Basically i want to join a table where a col in table A matches a col in table B and where a col in table B is equal to 0. I am using codeigniters active record class. Thanks in advance. ...

How to manipulate Data Transfer Object if sql join 2 tables?

I have a query in Data Access Object DAOComments that joins users table and comments table and then store the result into Data Transfer Object DTOComments: private static final String SQL_FIND_WITH_USERNAME = "SELECT u.username, comments.* FROM users u JOIN comments ON u.id = comments.id ORDER BY created_date DESC LIMIT 10;"; However...