right-join

问题 Quick Question Is there a better (i.e. more efficient / more concise) way to do this? compare-object $a $b | ?{$_.SideIndicator -eq '<='} Detail Compare-Object gives paramenters -excludeDifferent and -includeEqual to allow you to amend which results you get. using both gives you an inner join using just -includeEqual gives you a full outer join using just -excludeDifferent is pointless; as by default equal items are excluded, so it will now exclude everything. There are no options for

问题 Howdie do, I have the following SQL query which takes about 4 seconds to run: select o.id, tu.status_type, m.upload_date from (select order_id, max(last_updated) as maxudate from tracking_update group by order_id) t inner join tracking_update tu on t.order_id=tu.order_id and t.maxudate=tu.last_updated right join fgw247.order o on t.order_id=o.id left join manifest m on o.manifest_id=m.id where (m.upload_date >= '2015-12-12 00:00:00') or (m.upload_date <='2015-12-12 00:00:00' and tu.status

问题 I am confused with finding left outer join and right outer join properly with Oracle join (+) sign. Check this vs this. I feel both contradict. What I understand is, First link says if the (+) sign is in right hand side, it will be Right Outer Join. Whereas with second link, my understanding is totally wrong. Please clarify how to find the right and left outer join properly with an example? 回答1: Please clarify how to find the right and left outer join properly with an example I will give a

问题 I am working on a SQL query like this: Select a.field1, b.field2, c.field3, c.field4, b.filed5, a.field6, COALESCE(SUM(d.paid_amt) OVER (PARTITION BY a.some_column), 0) as amount_paid from a inner join b on a.field1 = b.field1 right join c on b.field2 = c.field3 left join d on d.filed3 = a.field1 and d.field8 = a.field3 where some conditions; The output of the above would be something like this: field1 | field2 | field3 | field4 | field5 | field6 | amount_paid -------+--------+--------+------

问题 I'm having trouble formulating a MySQL query correctly. Everything I've tried doesn't give me what's needed, or gives a syntax error. I have three tables: Clients, Courses, and CoursesForClients. The Clients table just has basic coordinates for a person: ID, Name, Address, email, etc. +----------+-----------------------------+------+ | ClientID | Name | Address | etc. | +----------+-----------------------------+------+ | 10 | Joe Smith | 1 Main St. | ... | | 20 | Bob Smith | 2 Main St. | ...

问题 I'm trying to get a list of products order by the amount sold and by date. I also want to display the products that haven't been sold in the list so I tried doing a subquery first but MYSQL is giving me this message: Operand should contain 1 column(s) SELECT product.product_id, product.product_brand_id, product.product_model_id, product.product_subcategory_id, product.product_retail_price, product.product_wholesale_price FROM product WHERE product.product_subcategory_id = $subcategory_id AND

问题 I am getting a syntax error with the following problem and can't seem to figure out, hope you guys can help me! I have these tables (they are populated): I am trying to retrieve the first and last name of all the passengers scheduled in a certain flight number so what I have is this: SELECT PassFName, PassLName FROM Passenger INNER JOIN PassID ON Passenger.PassID = Reservation.PassID INNER JOIN FlightNum ON FlightNum.Reservation = FlightNum.ScheduledFlight WHERE ScheduledFlight.FlightNum =

问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 6 years ago . I've heard there are 3 types of joins I'm not sure of the exact names. Googling has turned up a variety of terms like : Cross join , left join , right join , inner join , outer join, self join.... Could anyone

问题 users Table id user_comments Table id | user_id | content | created_at I have a list of user IDs, and I want to grab the latest 3 comments for each user id. SELECT * FROM user_comments WHERE user_id IN (1, 2, 3, 4, 5) ORDER BY created_at DESC LIMIT 3; This will grab the last 3 comments from all matching IDs, I want the last 3 comments for each ID. 1 query without unions preferred. I have tried right joining the table on itself but I cant seem to get it right. ** Edit: I cannot rely on the id

问题 Here are my models class Student: user = ForeignKey(User) department = IntegerField() semester = IntegerField() ... class Attendance: student = ForeignKey(Student) subject = ForeignKey(Subject) month = IntegerField() year = IntergerField() present = IntegerField() total = IntegerField() students = Student.objects.filter(semester=semester) How can I perform a right join between Student and Attendance models, so that I can get a queryset with all of the students and attendances` if exists for a