I have a events table, and I have a events_attendees table which has the event_id and user_id. For example, I want to find events around some user (user_id = 1) but also know whether or not they are attending through that additional column. Here’s the query that would get me the pins where the user is attending, but again I
Tag: left-join
Microsoft SMSS – Joining tables on t2.primary key = t1.foreign_key
I need to join two tables together to create a table with columns for employee id, employee name and their boss’ name. The ‘hier’ table The ’employees’ table The query I wrote is almost working, putting an employee name in the right spot, but not the right employee: Which outputs: I need to have each person’s boss to have the
SQL – left join performs cartesian/multiplies matched rows
I have a very simple example but can’t understand why final result of LEFT JOIN returns 4 rows with value 3. Do I understand correctly that LEFT returns as many results for each row in left table as many matches it finds in the right table? (nb of rows times x nb of rows in right table). If yes, why
How to SUM two SUMmed SQL result fields
I have a simple table structure holding records of reagent_bottles and reagent_aliquots. Aliquots are created from bottles, and an aliquot record got a foreign key, bottle_id, to a bottles id. To get the total volume of a particular reagent (counting both the volume in the bottles and the volume in the aliquots), the following query does the job, partly: returns
How calculate filtered by date aggregate sum after grouping by some column in SQL?
I have a table which contains payments received by person per date. I.e. We know how to calculate aggregate sum in SQL: We know how to calculate aggregated sum for some period of dates: Here is the question: what if I need last aggregate but I dont want to remove persons which never had payments on 12-12-2020? In other words,
How to substract 2 columns from different table with using count function? [closed]
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 1 year ago. Improve this question Currently, I am using count function to calculate the value for 2 columns and wanna substract the 2 columns and export to excel file. This
Select rows in left join which depend on sum of a field in the other table?
Im trying to write a SQL left outer join query where the left rows are selected based on the sum of a field in rows in the other (right) table. The other table has an id field that links back to the …
SQL Join that finds non matches
I have two tables “SellerDetails” and “ANL” and both have key fields of “Seller Ref No” and “Sales Year”. This giving me where there is a match on Seller Ref …
Left join without using view
I have a table structure similar to this: users | id | name | |—-|——–| | 1 | jane | | 2 | john | client | id | name | user_id | |—-|————|———| | 1 | client 1 |…
Joining rows and columns in SQL
Current Result: ID | Item | Red | Green | Blue | Yellow 03 balloon 1 0 0 0 03 balloon 0 1 0 0 03 balloon 1 0 0 1 24 ribbon …