Oracle - Introduction to Oracle9i - PL-SQL - Stude

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Generally use a procedure to perform an action and a function to compute a value. You can store subprograms at the server or application level. Using Oracle Developer components (Forms, Reports, and Graphics), you can declare procedures and functions as part of the application (a form or report) and call them from other procedures, functions, and triggers (see next page) within the same application whenever necessary. Note: A function is similar to a procedure, except that a function must return a value.

All rights reserved. Variable Initialization and Keywords In the syntax: identifier is the name of the scalar variable. expr can be a variable, literal, or function call, but not a database column. The variable value assignment examples are defined as follows: • Set the identifier V_HIREDATE to a value of 01-JAN-2001. • Store the name “Maduro” in the V_ENAME identifier. Variables are initialized every time a block or subprogram is entered. By default, variables are initialized to NULL. Unless you explicitly initialize a variable, its value is undefined.

LOB data types allow efficient, random, piecewise access to the data and can be attributes of an object type. LOBs also support random access to data. • The CLOB (character large object) data type is used to store large blocks of single-byte character data in the database in line (inside the row) or out of line (outside the row). • The BLOB (binary large object) data type is used to store large binary objects in the database in line (inside the row) or out of line (outside the row). • The BFILE (binary file) data type is used to store large binary objects in operating system files outside the database.

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