join

Need help with a simple Join

Oi Right to the problem. SELECT *,t.id AS threadid FROM threads t LEFT JOIN players p on p.id = t.last_poster WHERE t.boardid = $boardid I have two fields in threads called posterid and lastposterid. Which are the IDs of the thread starter / last poster. What I want to do is to get their names from players table. But how? ...

NHhibernate OUTER JOIN

criteriaCount.CreateAlias(AdvertisementsProperties.City.ToString(), "city") .CreateAlias(AdvertisementsProperties.Area.ToString(), "area") .Add(Restrictions.Disjunction() .Add(Expression.Like("Advertisement." + AdvertisementsProperties.Name.ToString(), text, MatchMode.Anywhere)) ...

How do I return a table in LINQ that relies on a join/subquery?

I need the fields in 1 table contingent on 1 property matching rows in another table. I can write this query in SQL with a subquery as such: SELECT * FROM Table1 WHERE Property1 IN ( SELECT Property1 FROM Table2 WHERE Property0 = 1 ) But I read here that it's less complicated and just as easy to write with a join, which I ...

Getting results from one table, grouped by user and date, joined on the user's name and account info from another table?

Let's say I have three tables (with the columns in each): USERS: id, name, account_id ACCOUNTS: id, name EVENTS: event_id, user_id, date And I want to get the total count of events from EVENTS for each user, within a date range, along with the user's name and account name. I can use GROUP BY to group the results by user_id, but how ...

Linking Multiple Tables in LINQ to SQL

I would like to get the list of albums (Distinct) which was sung by the artistId=1 I am very new to LINQ to SQL and do not know how to join multiple tables. Please see the database diagram below: SingBy is the middle table between Track and Artist. How could I achieve this? ...

How do you use a linq to sql join two tables and return the result?

I have been looking on Stack overflow but none of the answers seem to fully sort out this problem. The error I'm getting is: Cannot initialize type 'mvcTest.Models.MakeModelSpec' with a collection initializer because it does not implement 'System.Collections.IEnumerable' I have created a new type like this to get over the anonymous typ...

2 Right Outer Join in SQL Statement

Hi, I have an issue in understanding a very simple yet interesting query concerning 2 right outer joins with 'non-sequential' on-expressions. Here is the query: select * from C right outer join A on A.F1 = C.F1 right outer join B on B.F1 = C.F1; Here are the tables: create table A ( F1 varchar(200)); create table B ( F1 varchar(...

sql join within join?

I need your help building a SQL statement I can't wrap my head around. In a database, I have four tables - files, folders, folders_files and links. I have many files. One of them is called "myFile.txt". I have many folders. "myFile.txt" is in some of them. The first folder it appears in is called "firstFolder". I have many links to m...

SQL join table with two 'ON' keyword ???

Hi everyone, I have two tables tbl_a and tbl_b and their fields are tbl_a ----- a_id a_name a_surname a_c_id a_d_id tbl_b ----- b_id b_name b_phone b_c_id b_d_id I want to join these two table like this: select *from tbl_a join tbl_b on tbl_a.a_c_id=tbl_b.b_c_id AND tbl_a.a_d_id=tbl_b.b_d_id where tbl_a.id>15; As you can see i w...

Table join is so slow!!

Hi friends, I have joining two tables,There are hundreds of records in table a and there are hundred thousands records in table b.I joined them both inner and left join but it is two slow.My query is: SELECT ch.id, ch.client_client_id, ch.duration, ch.start, ch.isread, ch.prefix, ucr.ucr_add_factor, ucr....

Mysql query with Left Join is too very slow.

Query: select `r`.`id` as `id` from `tbl_rls` as `r` left join `tblc_comment_manager` as `cm` on `cm`.`rlsc_id` != `r`.`id` Both tables has 8k records but why it is too very slow taking 2-3 minutes and more sometime. OMG , this query makes mysql server down. Will get back to you peoples in a second :( All peoples those sug...

performance effect of joining tables form different databases

I have a web site using a database named lets say "site1". I am planning to put another site on the same server which will also use some of the tables from "site1". So should I use three different databases like "site1" (for first site specific data), "site2" (for second site specific data), and "general" (for common tables). In which ...

Oracle Join View - which rowid is used

Hi, CREATE VIEW EVENT_LOCATION ("EVENT_ID", "STREET", "TOWN") AS SELECT A.EVENT_ID, A.STREET, A.TOWN FROM TBLEVENTLOCATION A JOIN TBLEVENTS B ON A.EVENT_ID = B.EVENT_ID WHERE B.REGION = 'South'; if I run SELECT ROWID, STREET, TOWN FROM EVENT_LOCATION then which ROWID should I get back? Reason I'm asking is: In the data...

Database joins with three tables, one is a category / tag table

I have three database tables - one containing units, one containing categories of those units, and one containing user permissions. If a user can access a category, they are allowed to access any units within the category. I am trying to create a query that will retrieve a list of units they are allowed to access. So far I have a very ...

How to join RSS feeds into one? (from php)

How to join RSS feeds into one? (from php) what libs can help us with it? ...

Mysql join query for multiple "tags" (many-to-many relationship) that matches ALL tags?

I am trying to query for Objects that match ALL of a given set of Tags. Basically I want users to be able to add on more and more Tags to filter or "narrow down" their search results, kind of like newegg.com does. My table structure is a table of Objects, a table of Tags, and a MANY:MANY relation table ObjectsTags. So I have a JOIN qu...

JOINS in MYSQL and missing rows

I have a query like this one : SELECT DISTINCT `a`.*, `b`.*, `c`.* FROM `a` INNER JOIN `b` ON (`b`.`a_id` = `a`.`id` ) INNER JOIN `c` ON (`c`.`id` = `b`.`c_id`) WHERE ( (`a`.`id` = 12345) AND (`b`.`foo`= "bar") ) Basically, this takes the row from a with id=12345, and the rows from b that ...

Rails Join Table without Model

Is it possible to create a join table without a model. I have a model called User and Pet. I want user to have only one pet and pet to only have one owner. Very simple. However, I am trying to figure out how to create a join table pets_users that has both users.id and pets.id in it without having to create the actual model. Is this poss...

How can I code this Interesting Condition Join SQL

In a nutshell here is what I want to happen: Complete the join, if the rows do not exist do the same join but using one different value to fill the null columns in each row. Here is my join: Left Join CMS_ECH.dbo.hsplit hsplit on hsplit.row_date = ANDREWSTABLE.SegStart_Date and hsplit.split=ANDREWSTABLE.dispsplit and hsplit.starttim...

Audit Table DB Design : Does creating Audit Tables for Join Tables make sense

we are creating separate audit tables for those entity tables which need auditing using triggers on PostgreSQL 8.4. <Family> <Contact> <Family_Contact> <Address> We have some join tables. Eg : Family_Contact is a join table. Family has 1 or more than 1 contacts. Each contact has an Address. So, we have the following Table structure....