Before using any variable in batch or procedure, you need to declare the variable. 549. 33.4.2. vSite: = 'AODBA.com';. The FOR loop's iteration variable does not have to be pre-declared in the DECLARE section for the block the loop is located within; hence, the FOR loop is the only exception to the rule that all PL/pgSQL variables must be declared at the beginning of the block they are located within. PL/pgSQL Declaration : All variables must be declared in the declarations section of the block. The variable allows for temporarily storing data during code execution. To pass data from the program to the database, for example as parameters in a query, or to pass data from the database back to the program, the C variables that are intended to contain this data need to be declared in specially marked sections, so … PL/pgSQL: An abbreviation for Procedure Language/PostgreSQL. First, specify the name of the variable. This page aims at discussing possible variable designs within PosgreSQL.Such variables could be: 1. simple (typed?) This PostgreSQL tutorial explains how to declare variables in PostgreSQL with syntax and examples. share | improve this question | follow | edited Dec 5 '15 at 6:12. 452k 99 99 gold badges 835 835 silver badges 999 999 bronze badges. Jul 21, 2020 in PostgreSQL by Ravi . 0 votes . PostgreSQL provides a “type” called the record that is similar to the row-type. Variables are used within PL/pgSQL code to store modifiable data of an explicitly stated type. SET @myvar = 5. Function Structure in PostgreSQL CREATE FUNCTION FUNCTION_NAME (param1, param2)… Home | About Us | Contact Us | Testimonials | Donate. Please login or register to answer this question. Syntax: variable_name data_type [:= expression]; Let’s analyze the above syntax: First, specify the name of the variable. session variables, like My/MS/Oracle SQL 2. advanced session variables, i.e. Because this variable is declared using the CONSTANT keyword, you can not change its value after initializing the variable. To declare a record variable, you use a variable name followed by the record keyword like this: variable_name record; A record variable is similar to a row-type variable. Please Sign up or sign in to vote. See your article appearing on the GeeksforGeeks main page and help other Geeks. Declare Sections. A variable holds a value that can be changed through the block or function. Is there a straightforward way to adapt these types of MySQL queries to PostgreSQL: setting variables in MySQL like. For example, instead of naming a variable “i, Second, associate a specific data type with the variable. In PL/SQL, a variable is a meaningful name of a temporary storage location that supports a particular data type in a program. The syntax to declare a variable in PostgreSQL is: Below is an example of how to declare a variable in PostgreSQL called vSite. To pass data from the program to the database, for example as parameters in a query, or to pass data from the database back to the program, the C variables that are intended to contain this data need to be declared in specially marked sections, so the embedded SQL preprocessor is … Now we will initialize the variable by using the following statement: Code: num_of_students := 300. Please write to us at contribute@geeksforgeeks.org to report any issue with the above content. 496. 3. [ <