Left Join Question

Databases
1

Hello,

I need some help.
wanted to know how to use the function Left Join function, to combine 2 tables.
and wanted to know, if this functioni will slow my website .

thank you

2

I would suggest you do some searching. There are all sorts of tutorials on this topic. Here is one found here on Sitepoint: Understanding SQL Joins

The left join should not cause any significant performance decrease.