join

magento using join in grid.php prepareCollection

Can someone tell me how to make a join within magento Here is the problem: getCollection(); $collection->getSelect()->join(array('faqcat' => $this->getTable('faqcat/faqcat')), 'faqcat.faqcat_id=faq.faqcat_id' , array('faqcat.*')); ?> i am trying to make a join with the table faqcat where i use the key faqcat_id . futher i want that f...

django left join with null

The model: class Product(models.Model): name = models.CharField(max_length = 128) def __unicode__(self): return self.name class Receipt(models.Model): name = models.CharField(max_length=128) components = models.ManyToManyField(Product, through='ReceiptComponent') class Admin: pass def __unicode__(self): return ...

mysqli and inner join

hello i have problems with this script, i select from 2 tabels but i dont know how to bind the result i get this error Fatal error: Call to a member function bind_result() on a non-object this is my code http://pastebin.com/5sShTSMC Thanks ...

Mysql SQL join question

I am trying to find all deals information along with how many comments they have received. My query select deals.*, count(comments.comments_id) as counts from deals left join comments on comments.deal_id=deals.deal_id where cancelled='N' But now it only shows the deals that have at least one comment. What is the problem? ...

Join two Oracle queries

I've to query from two tables and want one result.. how can i join these two queries? First query is querying from two tables and the second one is only from one. select pt.id,pt.promorow,pt.promocolumn,pt.type,pt.image,pt.style,pt.quota_allowed,ptc.text,pq.quota_left from promotables pt,promogroups pg ,promotablecontents ptc ,promo...

Advanced SQL query with lots of joins

Hey fellow programmers Okay, first let me say that this is a hard one. I know the presentation may be a little long. But I how you'll bare with me and help me through anyway :D So I'm developing on an advanced search for bicycles. I've got a lot of tables I need to join to find all, let's say, red and brown bikes. One bike may come in ...

The best way to return related data in a SQL statement

I have a question on the best method to get back to a piece of data that is in a related table on the other side of a many-to-many relationship table. My first method uses joins to get back to the data, but because there are multiple matching rows in the relationship table, I had to use a TOP 1 to get a single row result. My second met...

select row from table and substitute a field with one from another column if it exists

I'm trying construct a PostgreSQL query that does the following but so far my efforts have been in vain. Problem: There are two tables: A and B. I'd like to select all columns from table A (having columns: id, name, description) and substitute the "A.name" column with the value of the column "B.title" from table B (having columns: id, t...

Speed up a query, simple inner join with one large table and one small table.

I have a table T1 with 60 rows and 5 columns: ID1, ID2, info1, info2, info3. I have a table T2 with 1.2 million rows and another 5 columns: ID3, ID2, info4, info5, info6. I want to get (ID1, ID2, info4, info5, info6) from all the rows where the ID2s match up. Currently my query looks like this: SELECT T1.ID1, T2.ID2, T2.info4,...

What is difference between Where and Join in linq ?

hello What is difference between of these 2 queries ? they are completely equal ? from order in myDB.OrdersSet from person in myDB.PersonSet from product in myDB.ProductSet where order.Persons_Id==person.Id && order.Products_Id==product.Id select new { order.Id, person.Name, person.SurName, product.Model,UrunAdı=produc...

Mysql slow query: INNER JOIN + ORDER BY causes filesort

Hello! I'm trying to optimize this query: SELECT `posts`.* FROM `posts` INNER JOIN `posts_tags` ON `posts`.id = `posts_tags`.post_id WHERE (((`posts_tags`.tag_id = 1))) ORDER BY posts.created_at DESC; The size of tables is 38k rows, and 31k and mysql uses "filesort" so it gets pretty slow. I tried to use different ...

how to create a linq query using join and max

I have 2 tables in my linq dbml. One is people with a uniqueid called peopleid and the other is a vertical with a foreign key for peopleid and a uniqueid called id. I need to create a type of linq query that does a left outer join on people and gets the latest record in the vertical table based off the max(id) column. Can anyone sugge...

MySQL - Limit a left join to the first date-time that occurs?

Simplified table structure (the tables can't be merged at this time): TableA: dts_received (datetime) dts_completed (datetime) task_a (varchar) TableB: dts_started (datetime) task_b (varchar) What I would like to do is determine how long a task took to complete. The join parameter would be something like ON task_a = task_b AN...

LINQ Joining in c# with multiple conditions

Hi Following query is not working is there any problem with it? var possibleSegments = from epl in eventPotentialLegs join sd in segmentDurations on new { epl.ITARequestID, epl.ITASliceNumber, epl.DepartAirportAfter, epl.AirportId_Origin, epl.AirportId_De...

Select in MySQL based on two tables

I have two tables. diseases ----------------------------- | ID | NAME | ----------------------------- | 1 | Disease 1 | | 2 | Disease 2 | | 3 | Disease 3 | diseases_symptoms ----------------------------- | DISEASE_ID | SYMPTOM_ID | ----------------------------- | 1 | 1 ...

Most optimal order (of joins) for left join

I have 3 tables Table1 (with 1020690 records), Table2(with 289425 records), Table 3(with 83692 records).I have something like this SELECT * FROM Table1 T1 /* OK fine select * is bad when not all columns are needed, this is just an example*/ LEFT JOIN Table2 T2 ON T1.id=T2.id LEFT JOIN Table3 T3 ON T1.id=T3.id and a query like this S...

Updating join fields in an ORM command

I have a question about object relational updates on join fields. I am working on a project using codeigniter with datamapper dmz. But I think my problem is with general understanding of ORMs. So fell free to answer with any ORM you know. I have two tables, Goods and Tags. One good can have many tags. Everything is working, but I am lo...

Treat multiple IEnumerable objects as a single IEnumerable

Hi, My question seems to be something easy, but I can't figure it out. Let's say I have a "root" IEnumerable of objects. Each object has IEnumerable of strings. How can I obtain a single IEnumerable of those strings? A possible solution is to do: public IEnumerable<string> DoExample() { foreach (var c in rootSetOfObjects) { ...

SQL-Join with NULL-columns

I'm having the following tables: Table a +-------+------------------+------+-----+ | Field | Type | Null | Key | +-------+------------------+------+-----+ | bid | int(10) unsigned | YES | | | cid | int(10) unsigned | YES | | +-------+------------------+------+-----+ Table b +-------+------------------+------+ ...

SQL query through an intermediate table

Given the following tables: Recipes | id | name | 1 | 'chocolate cream pie' | 2 | 'banana cream pie' | 3 | 'chocolate banana surprise' Ingredients | id | name | 1 | 'banana' | 2 | 'cream' | 3 | 'chocolate' RecipeIngredients | recipe_id | ingredient_id | 1 | 2 | 1 | 3 | 2 | 1 | 2 | ...