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Tag: left-join

left join on the first appeared row by datetime

If classes ‘Math’ or ‘Biology’ have flag is NULL or = 0, we need to left join with the first appeared (according to the date) classes ‘Literature’ or ‘English Literature’ from the below. If classes ‘Math’ or ‘Biology’ have flag = 1 then we need to left join with the most recent (according to the date) classes ‘Literature’ or ‘English

Join count query into one

I have two very simple count queries that I would like to join into one. To clarify the situation I will add the tables I got: Book isbn author 1111 GB 2222 DC 3333 RL Author code Name GB George B. KL Kyle L. DC Donald C. RL Roland L. Coauthor name isbn KL 1111 GB 2222 GB 3333 And

What will be the output of the left join? [closed]

Closed. This question needs debugging details. It is not currently accepting answers. Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question. Closed 8 months ago. Improve this question I have 2 tables A and B. Table A has 3 rows and

Getting null data for left join on same table twice

I have some tables like this: Employee: Teams: TeamMember: I am trying to get list of employees with info regarding who they are : Team Member or Team Leader or Individual. Current output: Expected output: Query: Only issue here is that I am getting TeamId and TeamName as blank for “Team Leader” data as shown below: Current output: Can anyone


I have multiple SQL queries that look similar where one uses JOIN and another LEFT OUTER JOIN. I played around with SQL and found that it the same results are returned. The codebase uses JOIN and LEFT OUTER JOIN interchangeably. While LEFT JOIN seems to be interchangeable with LEFT OUTER JOIN, I cannot I cannot seem to find any information