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Declaring variables. The syntax for a variable declaration is as follows: variable_name datatype [NOT NULL] [:= initial_value]; Code language: PostgreSQL SQL dialect and PL/pgSQL (pgsql) In this syntax: First, specify the name of the variable.
- PL/SQL Comments
PL/SQL comments allow you to describe the purpose of a line...
- PL/SQL Comments
21 paź 2024 · Here, we will explore various methods of declaring variables in PL/SQL, including syntax, examples, and practical use cases. We will cover variable initialization, scope, and the use of variable attributes like %TYPE and %ROWTYPE.
You can declare a single PL/SQL block and use PL/SQL variables: DECLARE v_string VARCHAR2(10) := 'Hello'; v_dt DATE := DATE '2020-04-13'; v_year NUMBER(4,0) := EXTRACT( YEAR FROM v_dt ); c_cur SYS_REFCURSOR; BEGIN OPEN c_cur FOR SELECT * FROM table_name WHERE col_a = v_string AND col_b = v_year; -- Do stuff in PL/SQL with the cursor.
In this tutorial, we have shown you how to declare, assign and initialize PL/SQL variables. We also walked you through how to declare PL/SQL variables using variable anchors to make your code more flexible and adaptable to the changes in columns of the database tables.
This Oracle tutorial explains how to declare variables in Oracle / PLSQL with syntax and examples. In Oracle / PLSQL, a variable allows a programmer to store data temporarily during the execution of code.
You can declare PL/SQL variables in two ways: – In the declaration section of the PL/SQL block. – In a procedure or function. When you declare a variable in the declaration section, it is called a local variable. A local variable is only visible to the block in which it is declared.
You can define variables and constants in PL/SQL and then use them in procedural statements and in SQL anywhere an expression can be used. For example: Command> DECLARE v_hiredate DATE; v_deptno NUMBER (2) NOT NULL := 10; v_location VARCHAR2 (13) := 'San Francisco'; c_comm CONSTANT NUMBER := 1400;
