join

Can't figure out a one-to-many bidirectional association with join table

I'm trying to figure out this mapping, and somehow it's just eluding me. It's irritating, because it seems like it should be a common case. I have a basic Parent and Child class with a join table between them. The Child class is dependent on the Parent: if an Child is removed from the Parent, the Child ought to be deleted as well. The H...

LEFT OUTER JOIN with a WHERE clause

I have two tables. indRailType contains a list of the names paired with an ID value that I use in other tables to indicate the rail type. WO_BreakerRail contains a date column and a rail code colume that corresponds to the same code in indRailType and some other data. There's a row in WO_BreakerRail for any activity on each rail type, fo...

Mysql filling in missing dates

I have the following query SELECT * FROM attend RIGHT OUTER JOIN noattend ON attend.date = noattend.date2 WHERE attend.date BETWEEN '2010-02-01' AND '2010-04-01' AND attend.customerid =1 ORDER BY date DESC LIMIT 0 , 30 Attend is the table with customerid noattend is the table with a row for each date (date2) I followed the advice i...

TSQL - How to join 1..* from multiple tables in one resultset?

A location table record has two address id's - mailing and business addressID that refer to an address table. Thus, the address table will contain up to two records for a given addressID. Given a location ID, I need an sproc to return all tbl_Location fields, and all tbl_Address fields in one resultset: LocationID INT, ...

Replace returned null values in LEFT OUTER JOIN

SELECT WO_BreakerRail.ID, indRailType.RailType, indRailType.RailCode, WO_BreakerRail.CreatedPieces, WO_BreakerRail.OutsideSource, WO_BreakerRail.Charged, WO_BreakerRail.Rejected, WO_BreakerRail.RejectedToCrop, WO_BreakerRail.Date FROM indRailType LEFT OUTER JOIN WO_BreakerRail ON indRailType.Rai...

How to insert the latest row_id of a table into a different table using Android and SQLite

I understand the title may sound confusing, but the goal is very clear: I am building an application that requires two tables: tracks and waypoints. A user enters the track name via a textfield and the table generates an ID under track_id. in the waypoints table there is a column called track_id_fk. When the OnLocationChanged() metho...

How do I avoid a repetitive subquery JOIN in SQL?

Hi In SQL Server 2008: I have one table, and I want to do something along the following lines: SELECT T1.stuff, T2.morestuff from ( SELECT code, date1, date2 from Table ) as T1 INNER JOIN ( SELECT code, date1, date2 from Table ) as T2 ON T1.code = T2.code and T1.date1 = T2.date2 The two subqueries are exactly identical. Is there...

Joining on a common table, how do you get a FULL OUTER JOIN to expand on another table?

I've scoured StackOverflow and Google for an answer to this problem. I'm trying to create a Microsot SQL Server 2008 view. Not a stored procedure. Not a function. Just a query (i.e. a view). I have three tables. The first table defines a common key, let's say "CompanyID". The other two tables have a sometimes-common field, let's say "...

How can you access two identically-named columns in a MySQL LEFT JOIN query?

I have two tables. table_x: id INT(11) tag INT(11) table_tags: id INT(11) name VARCHAR(255) Then I use PHP to perform the following query: SELECT * FROM table_x LEFT JOIN table_tags ON table_x.tag = table_tags.id The only problem is: how do I access table_x.id and table_tags.id in the results? Here is the PHP code: $...

Better way to do SELECT with GROUP BY

Hi i've wrote a query that works: SELECT `comments`.* FROM `comments` RIGHT JOIN (SELECT MAX( id ) AS id, core_id, topic_id FROM comments GROUP BY core_id, topic_id order by id desc) comm ON comm.id = comments.id LIMIT 10 I want know if it is possible (and how) to rewrite it to get better performance. Thanks ...

PHP / Zend Framework: Which object would handle a complex table join?

I think one of the more difficult concepts to understand in the Zend Framework is how the Table Data Gateway pattern is supposed to handle multi-table joins. Most of the suggestions I've seen claim that you simply handle the joins using a $db->select()... Zend DB Select with multiple table joins Joining Tables With Zend Framework PHP ...

SQL Grouping with multiple joins combining results incorrectly

Hi I'm having trouble with my query combining records when it shouldn't. I have two tables Authors and Publications, they are related by Publication ID in a many to many relationship. As each author can have many publications and each publication has many Authors. I want my query to return every publication for a set of authors and i...

Mysql JOIN problem

I have 2 mysql tables : Question with the following columns : id, question, nranswers Nranswers must be a number from 1 to 5 And the other table is Answers with the following columns: questionid, userid, answer . Now the problem is that I want to get the replies for each answer for one question(id 22 let's say) . P.S. If the n...

Difference between "and" and "where" in joins

Whats the difference between SELECT DISTINCT field1 FROM table1 cd JOIN table2 ON cd.Company = table2.Name and table2.Id IN (2728) and SELECT DISTINCT field1 FROM table1 cd JOIN table2 ON cd.Company = table2.Name where table2.Id IN (2728) both return the same result and both have the same e...

LEFT OUTER JOIN in NHibernate with SQL semantics

Hi, Is it possible to use HQL/ICritera to produce a query with the same semantics as the following SQL query: select table1.A, table2.B, count(*) from table1 left join (select table2.parent_id, table2.B from table2 where table2.C = 'Some value') as table2 on table2.parent_id = table1.id group by table1.A, table2.B order by table1.A ...

Selecting the first row out of many sql joins

Alright, so I'm putting together a path to select a revision of a particular novel: SELECT Catalog.WbsId, Catalog.Revision, NovelRevision.Revision FROM Catalog, BookInCatalog INNER JOIN NovelMaster INNER JOIN HasNovelRevision INNER JOIN NovelRevision ON HasNovelRevision.right = NovelRevision.obid ON Has...

LINQ to SQL join when there aren't results

Given the following database structure I'm trying to write a LINQ query that will return images grouped by tags it's associated with. So far I've got this: var images = from img in db.Images join imgTags in db.ImageTags on img.idImage equals imgTags.idImage join t in db.Tags on imgTags.idTag equals t.idTag where img.OCRDa...

Display user name in reference to user id in django template

I expect this is an easy question. For some reason, I don't have a solution yet. I have an object set from django reversion: version_list. Each object in the set has a user id attached to it. How do I grab the user names that correspond to the user ID's? To try to be clearer, if each object in version_list has a name, date, and us...

What's a reasonable number of rows and tables to be able to join in MySQL?

I have one table that maps locations to postal codes. For example, New York State has about 2000 postal codes. I have another table that maps mail to the postal codes it was sent to, but this table has about 5 million rows. I want to find all the mail that was sent to New York State, which seems simple enough, but the query is unbelievab...

introduce a join to this query, possible?

I'm trying to introduce a join to this query: SELECT `n`.*, round((`n`.`rgt` - `n`.`lft` - 1) / 2, 0) AS childs, count(*) - 1 + (`n`.`lft` > 1) + 1 AS level, ((min(`p`.`rgt`) - `n`.`rgt` - (`n`.`lft` > 1)) / 2) > 0 AS lower, (((`n`.`lft` - max(`p`.`lft`) > 1))) AS upper FROM `exp_node_tree_6` `n`, `exp_node_tree_6` `p`, `exp_node_tr...