Querying a Nested Table

Question

I\'m trying my hand at querying a NESTED TABLE using PL/SQL (which I\'m told by several sources is possible) but I keep getting the error message:

Answer 1

I don't understand the specific error you are getting, but generally you need to include an explicit cast to the appropriate type in the SQL statement:

open O_CURSOR for select * from table(CAST(dados AS t_pontos));

This is because the statement is handed off from PL/SQL to the SQL engine for processing, and it has no information about the type of the variable beyond it being user-defined.

Also, this only works if the type (t_pontos) is declared at the schema level, i.e. with a CREATE TYPE statement. If it is declared somewhere in PL/SQL code, e.g. in a package specification, the SQL engine cannot access the type definition.

Answer 2

Try defining your cursor in the beginning of your procedure and open it in the body of your procedure.