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You're reading from  Advanced Oracle PL/SQL Developer's Guide (Second Edition) - Second Edition

Product typeBook
Published inFeb 2016
Reading LevelIntermediate
Publisher
ISBN-139781785284809
Edition2nd Edition
Languages
SQL
Tools
Oracle Database
Concepts
Database Administration
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Author (1)
Saurabh K. Gupta
Saurabh K. Gupta
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Saurabh K. Gupta

Saurabh K. Gupta is a seasoned database technologist with extensive experience in designing high performance and highly available database applications. His technology focus has been centered around Oracle Database architecture, Oracle Cloud platform, Database In-Memory, Database Consolidation, Multitenant, Exadata, Big Data, and Hadoop. He has authored the first edition of this book. He is an active speaker at technical conferences from Oracle Technology Network, IOUG Collaborate'15, AIOUG Sangam, and Tech Days. Connect with him on his twitter handle (or SAURABHKG) or through his technical blog www.sbhoracle. wordpress.com, with comments, suggestions, and feedback regarding this book.
Read more about Saurabh K. Gupta

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Associative arrays

Associative arrays in Oracle are similar to conventional lists in other programming languages. An associative array is an unbounded array of cells and always defined in the declarative section of a PL/SQL program. While a cell is identified by an index of number or string type, it can hold a value of a scalar data type or user-defined composite type.

The syntax to declare an associative array in a PL/SQL block is as follows:

TYPE [COLL NAME] IS TABLE OF [ELEMENT DATA TYPE] NOT NULL
  INDEX BY [INDEX DATA TYPE]

In the syntax, the [INDEX DATA TYPE] signifies the data type of an array subscript. It can be BINARY_INTEGER, PLS_INTEGER, POSITIVE, NATURAL, SIGNTYPE, or VARCHAR2. The data types that are not supported as index types are RAW, NUMBER, LONG-RAW, ROWID, and CHAR.

The [ELEMENT DATA TYPE] can be one of the following:

  • PL/SQL scalar data type: NUMBER (along with its subtypes), VARCHAR2 (and its subtypes), DATE, BLOB, CLOB, or BOOLEAN

  • Inferred data: The data type inherited from...

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Advanced Oracle PL/SQL Developer's Guide (Second Edition) - Second Edition
Published in: Feb 2016Publisher: ISBN-13: 9781785284809
© 2016 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Saurabh K. Gupta

Saurabh K. Gupta is a seasoned database technologist with extensive experience in designing high performance and highly available database applications. His technology focus has been centered around Oracle Database architecture, Oracle Cloud platform, Database In-Memory, Database Consolidation, Multitenant, Exadata, Big Data, and Hadoop. He has authored the first edition of this book. He is an active speaker at technical conferences from Oracle Technology Network, IOUG Collaborate'15, AIOUG Sangam, and Tech Days. Connect with him on his twitter handle (or SAURABHKG) or through his technical blog www.sbhoracle. wordpress.com, with comments, suggestions, and feedback regarding this book.
Read more about Saurabh K. Gupta

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