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Tag: left-join

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

Count from 4 tables with join and null values

Tables: What I am expecting to query is this: However this is what I get: With this query: I wonder, in what way the query above could be modified to return the expected results? What would be a good approach to achieve this? Answer You are joining along two dimensions, so you are getting a Cartesian products. That is simply

MySQL tree structure

Hello i am trying to prepare tree structure with MySql, tables look something like this. My Question is: Is it possible to do left join and sort columns by name, but if in lang is eq to “fra” return that row with that name, otherwise return “eng” name. Pseudo code So final result will be something like this, in total

Return in which or statement results are from SQL [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 I’m having the following SQL statement, to return worksheets that teachers have liked, and worksheets that teachers made by themselves. It’s working fine, but now