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Implement the above two functions in PL/PGSQL See Appendix for PL/PGSQL tutorial.

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Introduction to PostgreSQL PL/pgSQL – introduce you to the PostgreSQL PL/pgSQL and explain to you their advantages and disadvantages.
Dollar-quoted string constants – learn how to use dollar-quoted string constant syntax.
Block Structure – introduce you to the PL/pgSQL block structure and show you how to develop and execute anonymous blocks.
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