Update table based on self table lookup in redshift

Question

I have the below table,

id   email   mgr_email   mgr_id
-------------------------------
1    email1   email2    
2    email2   email3
3    email3   email4
         


        

Answer 1

Use sub query for self join:

Try this:

update mytable 
    set mgr_id=t2.id 
    from (select id, email from mytable) t2 
    where mytable.mgr_email=t2.email