Database view table not returning any results

[matthew_hughes]

I've got the following database view where I'm wanting to return a list of software models with certification tasks:

However when I click on Try It, no results appear. I was expecting the following results to appear:

Can somebody explain what I'm doing wrong?

[Dr Atul G- LNG]

Hi @matthew_hughes 

Let's break this in to chunks, and try 

with 2 table and see results are coming then add 3  and check and then 4th and check

only way to trouble shoot.

[Ana39]

Hi there, It is pretty much try - change & try again. 
be aware that the order of the tables, has impact. the left join can be also one issue affecting the results.
today I faced that the text in the "where clause" was wrong, there was an "enter" and that is something it doesn´t like at all. 
I leave you here the one I was playing with today 

hope it helps!