Oracle Variable Types

A variable that has datetime data type hold value call datetimes. Oracle SQL automatically converts character value into default date format 'DD-MON-YY' TO_DATE values. Following are DateTime data types in Oracle SQL. This data type variable store full file locator's path, which points to a stored binary object within a server. BFILE

Typically, you declare a variable and select a value from a table column for this variable. If the data type of the table column changes, you must adjust the program to make it work with the new type. PLSQL allows you to declare a variable whose data type anchor to a table column or another variable. Consider the following example

The TYPE attribute is a powerful feature designed to enhance the readability, maintainability, and flexibility of code by associating variables with database columns or other variables. . The Oracle PLSQL TYPE attribute allow you to declare a constant, variable, or parameter to be of the same data type as previously declared variable, record

Every PLSQL constant, variable, parameter, and function return value has a data type that determines its storage format and its valid values and operations.. This chapter explains scalar data types, which store values with no internal components.. A scalar data type can have subtypes. A subtype is a data type that is a subset of another data type, which is its base type.

PLSQL has additional datatypes for constants and variables, which include BOOLEAN, reference types, composite types collections and records, and user-defined subtypes. See Also Oracle stores numeric data in variable-length format. Each value is stored in scientific notation, with 1 byte used to store the exponent and up to 20 bytes to

Variable-length character string having maximum length size bytes or characters. You must specify size for VARCHAR2. Minimum size is 1 byte or 1 character. Maximum size is Oracle recognizes the ANSI or IBM data type name that differs from the Oracle data type name, records it as the name of the data type of the column, and then stores the

For example, if you want to declare a variable that holds the first name of the employee with the VARCHAR2 data type, the variable name should be v_first_name. PLSQL Variables Declaration. To declare a variable, you use a variable name followed by the data type and terminated by a semicolon . You can also explicitly add a length constraint

Oracle-Supplied Types. Oracle provides some new data types which are not present in built-in or ANSI-supported types. These types can be implemented in CC, Java, or PL SQL. Here is the details Any Types The Any types provide highly flexible modeling of procedure parameters and table columns where the actual type is not known.

The fixed-length character data types are CHAR, NCHAR and the variable-length character data types are VARCHAR2, NVARCHAR2. VARCHAR is the synonym of VARCHAR2. However, you should not use VARCHAR because Oracle may change its semantics in the future. For character data types, you can specify their sizes either in bytes or characters. Number

To declare a variable in PLSQL, use the DECLARE keyword followed by the variable name and its data type. Optionally, you can also assign an initial value to the variable using the '' operator. Syntax DECLARE variable_name datatype initial_value here, variable_name It is the name of the variable. datatype It is the data type of the