left-join

Outer Join with some other tables in FROM

FROM [TABELA DE PRODUTOS/ESTOQUE] AS T1 , [TABELA DE PRODUTOS] AS T2 , [TABELA DE MOVIMENTAÇÃO DE ESTOQUE] AS T3 , [TABELA DE FORNECEDORES] AS T4 , [TABELA DE PRODUTOS/ESTOQUE] AS T5 WHERE (((T1.Produto)=[T2].[ID]) ETC So, how can I add a JOIN between those tables ? I need a left join, like: FROM [TABELA DE PRODUTOS/ESTOQUE] <- TABLE...

LINQ to SQL doing a Union and Left Outer Join

I have 3 tables. 2 contain lists of files that I need to do a UNION on to get all the unique files, then I want to do a left outer join against the 3rd table to find all the files that are in the 3rd table only and not in the other 2. To do the UNION I have the following: var imageUnion = (from img in dc.ImageT1 selec...

How can I count all the records in the both tables in a 1:n relationship in 1 query?

I'm guessing this a fairly easy question, but I've run into this problem a number of times and I can't find a solution either through searching (maybe I don't know what to search for) or trial and error. I have the following table structure and data: CREATE TABLE `table_a` ( `id` int(11) NOT NULL auto_increment, `table_b_id` int(11...

django left join

I have a bit of a left join issue.. I have the following models class CommandInfo(models.Model): server = models.ForeignKey(Server) count = models.IntegerField(default=1) ts = models.DateTimeField(auto_now=True) class Server(models.Model): name = models.CharField(max_length=100) group = models.ForeignKey(Application...

Entity Framework - Linq To Entities - Many-To-Many Query Problems

Hi, I am having problems querying many-to-many relationships in Linq To Entities. I am basically trying to replicate this query using Linq: Select * FROM Customer LEFT JOIN CustomerInterest ON Customer.CustomerID = CustomerInterest.CustomerID LEFT JOIN Interest ON CustomerInterest.InterestID = Interest.InterestID WHERE Interest.Intere...

Is too many Left Joins a code smell?

If you have for example > 5 left joins in a query is that a code smell that there is ... something wrong with your design? you're doing too much in one query? you're database is too normalized? ...

What is the precedence of multiple JOIN statements in sqlite?

The following two queries are returning different results, to my surprise: SELECT * FROM foo JOIN bar ON bar.id=foo.bar_id JOIN baz ON baz.id=foo.baz_id LEFT JOIN zig ON zig.foo_id=foo.id; and: SELECT * FROM foo LEFT JOIN zig ON zig.foo_id=foo.id JOIN bar ...

mysql count child table rows with condition

I have two tables: "user" -> "order" TABLE: user user_id ----------- u1 u2 TABLE: order order_id | user_id | flag ------------------------- o1 | u1 | fA o2 | u2 | fB Y need obtain all users counting how many times have orders with flag 'fA' RESULTS WHAT I NEED: user_id | orders ---------------- ...

Django select_related() for multi-join query using model & filters

Hi, I have two Models: Job & Location: class Job(models.Model): title = models.CharField(max_length=20) company = models.CharField(max_length=20) location = ForeignKey('Location') class Location(models.Model): country = models.CharField(max_length=20) state = models.CharField(max_length=20) city = models.CharField(m...

Left join using LINQ

Could someone give me an example of how to perform a left join operation using LINQ/lambda expressions? ...

join query with linq

I am trying here to make a few left joins into a linq query but I'd say I rather have no idea how to materialize this idea. Basically here is the 3 database structures I want to play with. <tags> id | name <events_tags> tag_id | event_id <events> id | name | some-other-fields so for each events there is a one-to-many relation with ...

Linq to Sql Localisation query

Given the following tables I'd like to return the localised text for given culture or the text for the default culture where no row exist for the given culture. So with the folowing data Resources ID Name 1 Donkey 2 Elephant LocaleStrings ID CultureID ResID LocaleText 1 1 1 Donkey 2 1 2 Elepha...

MySQL with 2 LEFT JOINs on the same table

Hi everyone. I'm trying to run this query: SELECT Destaque.destaque, Noticia.id, Noticia.antetitulo, Noticia.titulo, Noticia.lead, Noticia.legenda, Noticia.publicacao, Seccao.descricao, Album.pasta, Foto.ficheiro, Foto.descricao, Cronista.nome, Cronista.profissao, Cronista.ficheiro, AudioFile.*, AudioCollection.*, Video...

MySQL Join SUM column on the whole table

Hi all, Let's say I had the following table: id num_votes total_rating ------------------------------- 1 20 30 2 40 13 3 15 25 I want to join the SUM of all ids, let's say, onto the entire table so it looks like: id num_votes total_rating sum ----------------------------------...

How do I use a Left Join twice on the same colum with MySQL?

I have two tables, one for airports and one for routes. Airports looks a little like this Airports ------------------------------------- id | code | name | ------------------------------------- 01 | LGW | London Gatwick | ------------------------------------- 02 | LHR | London Gatwick | and so o...

How does a leftjoin work while using a initialized prepared statement for MySQLI?

The user comes to this page from a different page where they click on a link and it is appended with a ?photo_id= and then the id number. I want certain information to be available to the viewer when they arrive at this page. I want them to be able to see the photo, the photo name, and the photographers name. The first two are not a pro...

Help me out with this MySql full outer join (or union)

This is coming from converting MSSQL to MySql. The following is code I'm trying to get to work: CREATE TEMPORARY TABLE PageIndex ( IndexId int AUTO_INCREMENT NOT NULL PRIMARY KEY, ItemId VARCHAR(64) ); INSERT INTO PageIndex (ItemId) SELECT Paths.PathId FROM Paths, ((SELECT Paths.PathId FROM AllUsers, Paths ...

JOIN and LEFT JOIN equivalent in LINQ

I am working with the following SQL query: SELECT a.AppointmentId, a.Status, a.Type, a.Title, b.Days, d.Description, e.FormId FROM Appointment a (nolock) LEFT JOIN AppointmentFormula b (nolock) ON a.AppointmentId = b.AppointmentId and b.RowStatus = 1 JOIN Type d (nolock) ON a.Type = d.TypeId LEFT JOIN AppointmentForm e (nolock) ON e.Ap...

SQL LEFT JOIN return 0 rather than NULL

Hi I want to join two tables, with the number of records for each type being counted. If there are no records of that type in the left table I want a 0 to be returned, not a null. How can I do this? Karl ...

Empty Rows in MySQL SELECT with LEFT JOIN

I have three tables called: users, facilities, and staff_facilities. users contains average user data, the most important fields in my case being users.id, users.first, and users.last. facilities also contains a fair amount of data, but none of it is necessarily pertinent to this example except facilities.id. staff_facilties consists ...