Hi > -----Original Message----- > From: a [mailto:372660...@qq.com] > Sent: Mittwoch, 23. Mai 2018 11:43 > To: pgsql-general <pgsql-gene...@postgresql.org> > Subject: How do I select composite array element that satisfy specific > conditions. > > Hi, say if I have composite type and table > > create type A as( > x float8, > y float8 > ); > > create table B( > Ay A[] > ); > > insert into B > values(array[ > (1,2)::A, > (3,4)::A] > ); > > How could I select the element of Ay that satisfy x=3?? > > Thank you so much!! > > Shore
I did not really follow this thread, so I am not in clear, why you want to complicate your life that much. You create a custom data type and then use it in an array in a column. A complex hierarchical structure. Why don't you simply use JSON or JSONB? Your example sounds terribly academic very much like a school assignment. Bye Charles
