A very useful helper in your join toolbox can be a delete join. Even though it’s not a special join type but a join used within DELETE statements, it’s still worth mentioning. However, from time to time when I want to make use of delete joins on my own, I somehow managed it to forgot the syntax and have to look it up somewhere. Therefor, here is a description as well as an example.
Take care: A delete join is a very powerful weapon. And with great power comes great responsibility! I recommend to develop the delete join on a development database. At least, make sure you have a working an recent backup before trying to delete things. A delete statement that uses joins makes it easy to shot yourself in the foot. And if you do, it probably blows away your hole leg.
DELETE join syntax
When you …[Read more]