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PL/SQL lets you define two kinds of composite data types, collection and record.
You can use composite components wherever you can use composite variables of the same type.
tablespace_name, s.extent_management FROM user_tables t, user_tablespaces s WHERE t.tablespace_name = s.
Additionally, seeing lines upon lines of syntax definitions (although important in the long run) can be somewhat of a turn-off, and incomplete examples or code snippets often times leave you hanging (as in many calculus books, "proof of the following theorem is left to the curious reader.").Internal components can be either scalar or composite.You can use scalar components wherever you can use scalar variables.Oracle 10g (which is what I'm writing about here) also does not support recursive CTE's, so it's not possible to use this method too.However, there still is a way to improve the query.