how to make sure an employee doesn't work at two stores at the same time sql code example

Example: select a row include list of array with join two table SQL

SELECT e.aid, e.actors, a.act_names, e.benefactors, b.ben_names
FROM   eg_assoc e
, LATERAL (
   SELECT ARRAY( SELECT name
                 FROM   generate_subscripts(e.actors, 1) i
                 JOIN   eg_person p ON p.id = e.actors[i]
                 ORDER  BY i)
   ) a(act_names)
, LATERAL (
   SELECT ARRAY( SELECT name
                 FROM   generate_subscripts(e.benefactors, 1) i
                 JOIN   eg_person p ON p.id = e.benefactors[i]
                 ORDER  BY i)
   ) b(ben_names);