#left outer join

What is the Difference Between a Right Outer Join and Left Outer Join?

I recently put together a lesson on the difference between a Right Outer Join and Left Outer Join.  It is part of my Join Together Now course.  Click here get the course at a discount.  Outer joins are a greate way to match tables, while allowing still including rows from one table that don’t necessairly match to another table.

The good news is that when it comes to right outer joins or it twin…

SQL join and left outer join: why are the results differents? [duplicate]

This question already has an answer here:

Difference between inner and outer join 13 answers

I have a table partenaire. A partenaire may have one or more addresses. And of course one address may “belong” to more than one partenaire. So I have 3 tables: partenaire, partenaire_adresse and adresse. The address has only one town (villein French) so I have a foreign…

Import the data in main table from another table if that data not exist in main table Tip #30

  Dear Friends,

Sometimes we get task like, we need to import data in a target table from a source table and the condition is that the data which we are going to import should not exist in target table .

To achieve this we have two ways

1) Left outer join

2) Except clause

Lets understand this by an example

Suppose in my database I have a table with name tblUser  which has few columns and few…

So I have a products table :

And I have a Sales table:

If I want to find the sales for ALL products including the ones which are not present in the sales table, I can do this ( SQLITE syntax) :

select p.productname,

case when sum(amount) is null then 0 else sum(s.amount) end as totalsales

from product p left outer join sale s on p.productcode = s.productcode

where s.productcode is null or s.productcode is not null group by p.productname