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Search in an array in PostgreSQL

You can search in a an array by using the ANY function:

create table numbers as 
  select * from (
      (1, array[1,2]), 
      (2, array[2,3,4]), 
      (3, array[4,5,6])
as numbers(id, positions);

select *
from numbers
where 4 = any(positions);
 id | positions
  2 | {2,3,4}
  3 | {4,5,6}
(2 rows)
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