Question

I have a master table people

people fields: Id,AlterationDate

And an actions table actions in a one to many linkage

actions fields: Id, PeopleID, CreationDate

I want to find all records in people whose alteration dates are later than the latest creation date in actions joined by the persons id.

MySQL is the dialect, Dates are DateTime fields.

Answer 1

select people.* from people  
join actions on actions.peopleID = people.id  
group by people.id  
having max(action.CreationDate) < people.AlterationDate