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| Part IV |

# Part IV: Modular Code

Part IV of this book goes beyond the individual components of the PL/SQL language and explains how to build complete PL/SQL applications using program modules.

- Chapter 15, Procedures and Functions, presents the basics of modular programming in PL/SQL using blocks, procedures, functions, and parameters.

- Chapter 16, Packages, describes how to build packages, one of the least understood and least utilized features of PL/SQL.

- Chapter 17, Calling PL/SQL Functions in SQL, describes how you can construct PL/SQL functions and call them from SQL.

14.3 Conversion Function Examples |  | 15. Procedures and Functions

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