join

Can this be written without using a view and instead use a subquery or something

CREATE VIEW myView AS SELECT * FROM `ce_userbadges` WHERE ceub_userid =85; SELECT * FROM ce_badge LEFT JOIN myView ON ceb_id = ceub_badgeid; So it has to select all badges user 85 has and also the badges they dont have (hence the left join). I tryed this but it does the userid filtering after the join SELECT * FROM ce_userbadges r...

Am I joining these 4 tables correctly?

My query is terribly big: SELECT n1.*, n2.rating, n3.*, n4.* FROM stats n1 INNER JOIN members n2 ON n1.n_id = n2.id INNER JOIN add_info n3 ON n1.n_id = n3.n_id INNER JOIN other_table n4 ON n1.code = n4.code WHERE n1.n_id = {$member_id} AND n1.code='{$some_code}' Am I doing this correctly? If yes, can I make it better, more optimal? Be...

Nested SQL Query

I have the following tables: Club: Club_ID | Title | Created_Date | ... Club_Intesect: User_ID | Club_ID | Access I'm trying to select a variable number of clubs, and join the ID of the user with the highest access in that club. This person is considered the owner. So if Club 100 has Members A, B, C with access 3,4, and 5 ...

one to many join - taking only the last one on the many part

I'm quite a newbie in EF, so I'm sorry if my question has been answered before.. I just can't figure out the syntax.. I have two entities, Category & Product, where one category has many products. I want to get all categories, with only their latest product (it has a date property named timestamp) I have no idea how to do that. :-/ I...

How do I get the output of an object which has more than one line in Perl?

@ver = $session->cmd("sh conf"); The variable here is ver, which has the configuration file, that is, it has more than one line. So how to take an output of each line of the ver variable without putting it in a loop? ...

Left Joining on Multiple Tables with Timestamps

Ok SQL and Oracle gurus I have a somewhat complicated query that I'm trying to build. Here is my current query: select distinct person_info.person_name table2.value, table3.value, table4.value, table5.value from person_info left join table2 on table2.person_name=person_info.person_name left join table3 on ta...

Django select objects with empty ManyToManyField

Considering the following models, knowing a family, how do I select Kids with no buyers? class Family... class Kid(models.Model): name = models.CharField(max_length=255) family = models.ForeignKey(Family) buyer = models.ManyToManyField(Buyer, blank=True, null=True) family = get_object_or_404(Family, pk=1) for_sale = family...

SQL statement to get all customers with no orders

I have a typical Persons table and an Orders table defined in such a way that I can do JOIN query as the following to return Orders for all Persons. SELECT Persons.LastName, Persons.FirstName, Orders.OrderNo FROM Persons INNER JOIN Orders ON Persons.id=Orders.Person_id The question is, how do I write a statement that would return all ...

Entity Framework - How do I join with an OR condition on several keys

joining tables on two columns is easy from t1 in table1 join t2 in table2 on new { KEY1 = t1.TB1Key1, KEY2 = t1.TB1Key2 } equals new { KEY1 = t2.TB2Key1, KEY2 = t2.TB2Key2 } select new { t1 , t2} but what if i want an OR condition? the SQL will look something like this: select * from table1 t1 inner join table2 t2 on t1.TB1...

Strange join syntax in legacy SQL code

I have some legacy code I'm going through, and i just found a join with two "on" clauses... select * from table inner join table3 inner join table2 on table3.key = table2.fkey on table.key = table2.otherkey What does this kind of join mean? (It currently works so it's not a syntax error) (Edit: Fixed the code, was missing a join) ...

MySQL multiple variables in LEFT JOIN

I have table dates as following "dates" "one" "two" "three" "four" date1 id1 id2 id3 id4 date2 id3 id1 id4 id2 and a second table id2name "ids" "names" id1 name1 id2 name2 id3 name3 id4 name4 I have a mental block trying to write SELECT * FROM dates WHERE `date`='$date' LEFT JOIN `id2name` O...

Data Flattening With SQL

This one seems so simple but I cannot figure it out. I have data stored like this... ManagerID EmployeeID MangerName 0 0 Debbie 1 0 Mark 2 2 Chris 3 2 Leo 4 1 Mar 5 2 Steve...

Finding missing tables to avoid cross joins

Hi, the user in my application can choose freely some fields from the database. people + peopleid + peoplename cars + carid + carnumber + carcolor pers_car + carid + peopleid Lets assume the user is selecting the fields peoplename and carcolor to find out which person likes which colours. Is it possible to identify the missing per...

merge tables and query

I have this tables in my mysql schema: posts: --------------------------------------------- id|type | userid | title | msg | time_added users: ------------------ userid | username How can I show only 6 entries where: type is audio or video and only for a certain username? ...

MySQL joins for friend feed

Hi everyone, I'm currently logging all actions of users and want to display their actions for the people following them to see - kind of like Facebook does it for friends. I'm logging all these actions in a table with the following structure: id - PK userid - id of the user whose action gets logged actiondate - when the action happe...

JPA criteria builder with multiple joins

hi, i'm struggling to create a jpa query that makes use of several tables. i cannot seem to understand how to join the tables together. this is the query i am trying to create: SELECT algm.m_l_i, algnsm.n_s_i FROM algm, alg, algnsm, mal WHERE algm.l_g_i = alg.l_g_i AND alg.l_g_t = 'xxx' AND algnsm.l_g_i = algm.l_g_i AND mal....

Idiomatic R method for "left joining" two data frames

I have two data frames that both have a column containing a factor like the following: > head(test.data) var0 var1 date store 1 109.5678 109.5678 1990-03-30 Store1 2 109.3009 108.4261 1990-06-30 Store1 3 108.8262 106.2517 1990-09-30 Store1 4 108.2443 108.6417 1990-12-30 Store1 5 109.5678 109.5678 1991-03-30 Store1 6 109...

Parse NSDictionary to a string with custom separators

Hey! I have an NSMutableDictionary with some values in it, and I need to join the keys and values into a string, so > name = Fred > password = cakeismyfavoritefood > email = [email protected] becomes name=Fred&password=cakeismyfavoritefood&[email protected] How can I do this? Is there a way to join NSDictionaries i...

MySQL: Join two tables, select one row at random.

First off, I created a screen cast, in order to explain what I have and what I'm attempting to create. Much easier to understand. Please view the screen cast here: http://www.youtube.com/v/lZf3S3EGHDw?fs=1&hl=en_US&rel=0&hd=1 Tables: CREATE TABLE `locations` ( `id` int(11) NOT NULL AUTO_INCREMENT, `title` varchar(45) D...

Are all MySQL joins selections on the Cartesian product?

On reading the documentation of the MySQL join commands, it looks like all the joins are analogous to , by simply finding the Cartesian product and then selecting from that result. Is this an accurate assumption? Should I instead write my own sub-queries and select from those? ...