Question : We have recently migrated from MySQL 5.5 to 5.6 (5.6.44-86.0-log Percona Server to be precise) and we have […]
Category: Join
How can I select all online friends?
Question : I’m currently working on a social network software written in PHP & MySQL, and it’s all pretty fine, […]
How do I select only records which are referenced by their children in other tables?
Question : Not sure if the question is phrased correctly but here’s an example of the schema: CREATE TABLE TabA […]
Leaf Joins in Data Warehouse Design
Question : Upon modeling my very first data warehouse model (for historical stock market data), I stumbled across a data […]
Right Full Outer Join Query
Question : I came across 1 query which is Select * from R Natural Outer Join S Where R=(A,B) has […]
How to make an union on 2 joined tables without affecting the sum on the column? [closed]
Question : Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? […]
Selecting non-aggregate column on 3 table inner join
Question : I have 3 tables in a standard parent/child kind of “belongs to” relationship in postgres: donations –(belong to)–> […]
Usage of aggregate function with when self-joining a table
Question : I want to find people from a database who has a weight bigger then the average weight: SELECT […]
MySQL: JOIN and Conditional Statement
Question : Can comeone help me to decipher the right logic of code needed for my query? I just can’t […]
LEFT JOIN conversion to INNER JOIN, can’t change FROM clause
Question : I have 2 tables: BASE is master and is linked with CHILD via field ID: Left outer Join […]