To create PL/SQL tables, you take two steps. That allows you to pass host arrays to stored functions and procedures. You can even use PL/SQL tables of records to simulate local database tables.Īlso, with the Oracle Call Interface (OCI) or the Oracle Precompilers, you can bind host arrays to PL/SQL tables declared as the formal parameters of a subprogram.
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So, PL/SQL tables make it easy to move collections of data into and out of database tables or between client-side applications and stored subprograms. They can store columns or rows of Oracle data, and they can be passed as parameters. ) to index a PL/SQL table of employee names.
#MIRACLE A5 INSTACODE UNKNOWN DATA SERIES#
For example, you can use a series of employee numbers (such as 7369, 7499, 7521, 7566. This characteristic, called sparsity, allows the use of meaningful index numbers. Second, arrays require consecutive index numbers, but PL/SQL tables do not. So, the size of a PL/SQL table can increase dynamically. First, arrays have fixed lower and upper bounds, but PL/SQL tables are unbounded. However, PL/SQL tables differ from arrays in two important ways. Each element has a unique index number that determines its position in the ordered collection. Like an array, a PL/SQL table is an ordered collection of elements of the same type. Think of the key and rows as the index and elements of a one-dimensional array. Although you cannot use SQL statements to manipulate a PL/SQL table, its primary key gives you array-like access to rows. For example, a PL/SQL table of employee names is modeled as a database table with two columns, which store a primary key and character data, respectively. Objects of type TABLE are called PL/SQL tables, which are modeled as (but not the same as) database tables.
#MIRACLE A5 INSTACODE UNKNOWN DATA HOW TO#
You also learn how to reference and manipulate these collections as whole objects.
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In this chapter, you learn about the composite datatypes TABLE and RECORD, which can store collections of data. In Chapter 2, you learned about the PL/SQL scalar datatypes, which can store only one item of data. Knowledge is that area of ignorance that we arrange and classify. PL/SQL Tables and User-Defined Records PL/SQL User's Guide and Reference