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There are a several ways of declaring variables in SQL*Plus scripts. The first is to use VAR, to declare a bind variable. The mechanism for assigning values to a VAR is with an EXEC call: SQL> var name varchar2(20) SQL> exec :name := 'SALES' PL/SQL procedure successfully completed.
5 lip 2011 · In ORACLE SQL Developer 20.2.0.175, we can Run Script (F5): DEFINE usr = 'YourName'; SELECT * FROM Department WHERE created_by = '&usr';
If you want to use the value of a bind variable in a SQL*Plus command, it must first be copied to a substitution variable. SQL*Plus commands such as SPOOL, SET and TTITLE are executed in the SQL*Plus program and are not passed to the database for execution.
In PL/SQL, a variable is named storage location that stores a value of a particular data type. The value of the variable changes through the program. Before using a variable, you must declare it in the declaration section of a block. Declaring variables. The syntax for a variable declaration is as follows:
Syntax. VAR [IABLE] [variable [type [= value]]] Declares a bind variable that can be referenced in PL/SQL, or lists the current display characteristics for a single variable or all variables. type represents one of the following:
DEFINE. Database / Oracle / Oracle Database / Release 19. User's Guide and Reference. 12.17 DEFINE. Syntax. DEF[INE] [variable] | [variable = text] Specifies a user or predefined variable and assigns a CHAR value to it, or lists the value and variable type of a single variable or all variables. Terms. variable.
Parsing SQL statements is a resource intensive process. Reducing the number of hard parses results in reduced CPU usage. Bind variables protect against SQL Injection. In the sections below you will see the impact of using literals, substitution variables and bind variables in your code. Literals.
