I am using the oid of the table as the main key and I've found that is
not indexed (maybe because I have declared another primary key in the table)
it is a good practice to create an index like this on the oid of a table?
CREATE INDEX idoid annuncio400 USING btree (oid);
does it work as a normal index?
Thank you
Edoardo
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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match
