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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.
Using Aliases The Select-list items fetched from a cursor related with the %ROWTYPE should have simple names or, if they are expressions, should have aliases. In the example bel
Parameter SELF in pl/sql The MEMBER methods recognize a built-in parameter named SELF that is an instance of the object type. Whether declared explicitly or implicitly, it is
Left and Right Joins LEFT OUTER JOIN can be used when you want to retrieve the data from the main table (table1) even if there is no match in other tables (table_2, table_3...
Question: (a) The objective of query optimization is to choose the most efficient strategy for implementing a given relational query, thereby improving the system performance. On
Projection in SQL - correct version Student StudentId is enrolled on some course. SELECT DISTINCT StudentId FROM IS_ENROLLED_ON In more complicated examples it is someti
Project Description: I want to write some SQL statements. The things I need are between pages 5-7. The only problem is that i want it till tomorrow. Skills required is SQL
Write SQL queries to solve the following specifications. Include the query AND THE OUTPUT. A screen dump of the output is acceptable. Show as many rows as you can. A screen dump i
PITS Depressions in secondary cell wall is called pit. A pit present on the free cell wall surface without its partner is called Blind pit. It consists of 2 parts -
Manipulating Local Collections Within PL/SQL, to manipulate the local collection, by using the TABLE and CAST operators . The operands of CAST are a collection declared locally
Fetching with a Cursor The FETCH statements retrieve the rows in the result set one at a time. After each and every fetch, the cursor advance to the next row in the result set
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