PL/SQL - Collections

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You also learn how to reference and manipulate these collections as whole objects. Think of the key and rows as the index and elements of a one-dimensional array.

Each element has a unique index number that determines index by binary_integer count position in the ordered collection. This characteristic, called sparsityallows the use of meaningful index numbers. For example, you can use a series of employee numbers such as, They can store columns or rows of Oracle data, and they can be passed as parameters. That allows you to pass host arrays to stored functions and procedures. For example, the following declaration is illegal: As the example below shows, the index number can be negative.

For example, the following assignment is legal: Until an element is assigned a value, it does not exist. That is, the following syntax is illegal: COUNT gives you the answer. FOR i IN NEXT n returns the index number that succeeds index n. Likewise, if n has no successor, NEXT n returns index by binary_integer count null. For example, the following statement assigns index n to itself: Recall that index numbers need not be consecutive. Consider the following index by binary_integer count As you delete elements, memory is freed page by page.

If you try, you get a compilation error, as the index by binary_integer count example shows: Or, you can select an entire row into a record element. Instead of the FETCH statement, you can use a cursor FOR loop, which implicitly declares its loop index as a record, opens the cursor associated with a given query, repeatedly fetches rows of values into index by binary_integer count in the record, then closes the cursor.

Given the array subscript range m. For example, if the index by binary_integer count subscript range is The corresponding actual parameters are host arrays. By default, when binding the host array, the Oracle Precompilers use its declared dimension. This saves time and reduces network traffic. But, you cannot specify the datatypes of fields in the record or declare fields of your own.

Records contain uniquely named fields, which can have different datatypes. Suppose you have various data about an employee such as name, salary, and hire date. These items are dissimilar in type but logically related.

A record containing a field for each item lets you treat the data as a logical unit. Each field has a unique name and specific datatype. When you declare a record of type TimeTypits three fields assume an initial value of zero. Index by binary_integer count is, a record can be the component of another record, as the following example shows: That allows the function to return a user-defined record of the same type. Like scalar variables, user-defined records can be declared as the formal parameters of procedures and functions.

You can assign the value of an expression to a specific field using the following syntax: This can index by binary_integer count done in two ways. First, you can assign one record to another if they have the same datatype, as the following example shows: The column names must appear in the same order as the fields in your record.

So, the following statement is illegal: Therefore, the following syntax is index by binary_integer count For instance, the following IF conditions are illegal: Such assignments are allowed even if the parent records have different datatypes.

END; Function Results When calling a function that returns a user-defined record, you use the following syntax to reference fields in the record: The information is easy to manipulate because you can refer to the collection as a whole. In the following example, you collect accounting figures from the database tables assets and liabilitiesthen use ratio analysis to compare the performance of two subsidiary companies:

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Table of Number An example of declaring an Index-by table Initializing a Nested Table Is a table collection a null value Reference to uninitialized collection Initialize table collection with null value Accessing an Index-by table Accessing an entire Index-by table Accessing an undefined row of an Index-by table Deleting an Index-by table using an empty Index-by table Add two null value members at the end of the list.

Add three members at the end of the list and copy the contents of item 4 Accessing Nested Table elements Subscript beyond count Loop through table of number by index. An example of declaring an Index-by table. Initializing a Nested Table. Is a table collection a null value. Reference to uninitialized collection.

Initialize table collection with null value. Accessing an Index-by table. Accessing an entire Index-by table. Accessing an undefined row of an Index-by table. Deleting an Index-by table using an empty Index-by table. Add three members at the end of the list and copy the contents of item 4. Accessing Nested Table elements.