sql server - How to use clustering with unique constraints in postgres? -


how can add clustered/nonclustered indexing unique constraints in postgres, equivalent script in sql server below, how can achieve postgres 

create table tbl1( col1 int, col2 int, col3 int, constraint uk_tbl1 unique nonclustered  ( col1 asc, col2 asc ))

any indexing unique constrained columns appreciated.

from docs:

adding unique constraint automatically create unique btree index on column or group of columns used in constraint.


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