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What Is a CollectionThe collection is an ordered group of elements, all of similar type (for e.g. the grades for a class of students). Each element has a unique subscript which determines its position in the collection. The PL/SQL offers two collection types. The Items of type TABLE are either index-by tables or nested tables (that extend the functionality of the index-by tables). The Items of type VARRAY are varrays (short for the variable-size arrays).The Collections works like the arrays found in most of the third-generation programming languages. Though, collections can have only one dimension and should be indexed by the integers. (In few languages like Ada and Pascal, the arrays can have multiple dimensions and can be indexed by the enumeration types.)The Collections can store instances of an object type and, on the contrary, can be attributes of an object type. The collections can also be passed as parameters. Therefore, you can use them to move the columns of data into and out of the database tables or between client-side applications and stored subprograms. Moreover, you can define the collection types in a PL/SQL package, and then use them programmatically in your applications.
Explicit Cursors The set of rows returned by the query can include zero, one, or multiple rows, depending on how many rows meet your search criteria. Whenever a query returns
Keyword &Parameter Description: index_name: This is an undeclared identifier which can be referenced only within the FORALL statement and only as the collection subscript
CURRVAL and NEXTVAL The series is a schema object which generates the sequential numbers. Whenever you form a sequence, you can specify its primary value and an increment. T
Parameter and Keyword Description: collection_name: This keyword identifies the index-by table, nested table, or varray formerly declared within the present scope. cu
Task 2 [12 marks] Write the package body for the following package specification (the detailed description of each function and procedure is provided in the appendix below). Place
Effect of Anonymous Columns Now, recall that a VALUES expression denotes a table with undefined column names. If an initial value is to be specified when a base table is creat
Bitmap Join Indexes - This feature will increase the performance and detains the size and format of your databases in data Character Semantics and Globalization -This featur
JOIN and AND in SQL In this Section is all about one operator, JOIN. SQL's closest counterpart, NATURAL JOIN, has already been covered. Here we look at several other "join" op
Selecting Objects: Suppose that you have run the SQL*Plus script below that creates object type Person and object table persons, and that you have settled the table: CREATE
i NEED THE QURIES TO SOME OF THE PROBLEMS USING plsql
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