mysql count, distinct, join? COnfusion
hello i have 2 tables: tblItems ID | orderID | productID 1 1 2 2 1 2 3 2 1 4 3 2 tblProducts productID | productName 1 ABC 2 ...
join
MySQL - getting SUM of MAX results from 2 tables
Hi, Here's my problem: I have 2 identical tables (past month data, current month data) - data_2010_03, data_2010_04: Content_type (VARCHAR), content_id (INT), month_count (INT), pubDate (DATETIME) Data in month_count is updated hourly, so for each combination of content_type and content_id we insert new row, where value of month_count ...
Join two results in Powershell
I've got two CMDlets that return lists of objects. One returns objects of the type SPSolution, which contains the property Id, the other returns objects of the type SPFeature with a property SolutionId. Now I want to join/merge this data something like this: $f = Get-Feature $s = Get-Solution $result = <JOIN> $f $s <ON> $f.So...
Oracle intermediate join table size
When we join more than 2 tables, oracle or for that matter any database decides to join 2 tables and use the result to join with subsequent tables. Is there a way to identify the intermediate join size. I am particularly interested in oracle. One solution I know is to use Autotrace in sqldeveloper which has the column LAST_OUTPUT_ROWS. B...
Grails - Need to restrict fetched rows based on condition on join table
Hi guys, I have these two domains Car and Driver which have many-to-many relationship. This association is defined in table tblCarsDrivers which has, not surprisingly, primary keys of both the tables BUT additionally also has another boolean field deleted. Herein lies the problem. When I find/get query on domain Car, I am fetched all re...
correlated query /subquery VS join query
can we always convert a usual subquery/correlated subquery to join type query? ...
Hibernate HQL m:n join problem
I am very unfamiliar with SQL/HQL , and am currently stuck with this 'maybe' simple problem : I have two many-to-many Entities , with a relation table : Car , CarProblem , and Problem . One Car may have many Problems , One Problem may appear in many Cars, CarProblem is the association table with other properties . Now , I want to ...
How to Stich to Image objects in Java
Hi, I have a scenario in which i`m getting a number of tiles (e.g.12) from my mapping server. Now for buffering and offline functions I need to join them all back again so that we have to deal with 1 single image object instead of 12. I ve tried to do it without JAI my code is below. package imagemerge; import java.awt.*; import java...
(self,left outer,right outer,full outer) join - real world examples
can you tell me simple real-world examples for (self,left outer,right outer,full outer) join? ...
How to coerce type of ActiveRecord attribute returned by :select phrase on joined table?
Having trouble with AR 2.3.5, e.g.: users = User.all( :select => "u.id, c.user_id", :from => "users u, connections c", :conditions => ... ) Returns, e.g.: => [#<User id: 1000>] >> users.first.attributes => {"id"=>1000, "user_id"=>"1000"} Note that AR returns the id of the model searched as numeric but the selected user_id of...
limiting consecutive values of one column in a sql query.
I have a table with the following structure: id -int(11) event_id -int(11) photo_id -int(11) created_at -datetime How do I write a query that will return the 100 most recent rows, but insuring that there are no more than 4 consecutive rows with the same value in photo_id ...
What are some good examples where SQL's OUTER JOIN is used?
I often get asked the questions in an interview that "what is an outer join in SQL"? While it can be answered, I wonder what might be some classic and good real life examples where a (LEFT) OUTER JOIN is used? ...
Counting and joining two tables
Eventhosts – containing the three regular hosts and an "other" field (if someone is replacing them) or edit: being a guest host (in addition to the regulars) eventid | host (SET[Steve,Tim,Brian,other]) ------------------------------------------- 1 | Steve 2 | Tim 3 | Brian 4 | Brian 5 | other 6 | othe...
What is a SQL statement that can find all classes with no student registering in them yet?
Say, in a typical university's Database System, what might be a SQL statement that can find all classes with no student registering in them yet? (when registration process is for 10 days and it is now the 3rd day). What might be other SQL statement solutions? Details: Assuming the university have many Departments, and each Departmen...
Application doesn't exit with 0 threads
We have a WinForms desktop application, which is heavily multithreaded. 3 threads run with Application.Run and a bunch of other background worker threads. Getting all the threads to shut down properly was kind of tricky, but I thought I finally got it right. But when we actually deployed the application, users started experiencing the...
How to join 1 table twice in the same query and keep results separate
Hi, we're building a scheduler system and have a couple of situations where we're trying to get some notes from a table to display. We've looked at other answers and none seem to quite match this problem. The bookings table holds a numeric reference to both a client note (if present) and a stylist note (if present). The notes table ho...
What is a SQL statement that can tally up the counts even including the Zeros? (all in 1 statement)
A SQL statement can give a list of the most popular gifts that are sent in a Social application, all the way to the ones that are sent 1, or 2 times, but it won't include the Zeros. I think the same goes for getting the list of the most popular Classes that students are registering for, when the registration process for all students is ...
Can MySQL / SQL's short hand of "Using" be used without saying "Inner Join" ?
The following 2 statements are to join using gifts.giftID = sentgifts.giftID: mysql> select * from gifts, sentgifts using (giftID); ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'using (giftID)' at line 1 and the second one: m...
SQL query to return data from two separate rows in a table joined to a master table
I have a TWO tables of data with following fields table1=(ITTAG,ITCODE,ITDESC,SUPcode) table2=(ACCODE,ACNAME,ROUTE,SALMAN) This is my customer master table that contains my customer data such as customer code, customer name and so on... Every Route has a supervisor (table1=supcode) and I need to know the supervisor name in my t...
In SQL, a Join is actually an Intersection? And it is also a linkage or a "Sideway Union"?
I always thought of a Join in SQL as some kind of linkage between two tables. For example, select e.name, d.name from employees e, departments d where employees.deptID = departments.deptID In this case, it is linking two tables, to show each employee with a department name instead of a department ID. And kind of like a "linkage"...