psql variable assignment

As of postgresql 9.1, in psql you can now use :'variable' to have it properly quoted as a value for you, or :"variable" to use it as an identifier.

In this tutorial, you will learn how to declare PL/pgSQL variables in blocks and how to use variables effectively.

This PostgreSQL tutorial explains how to declare variables in PostgreSQL with syntax and examples. In PostgreSQL, a variable allows a programmer to store data temporarily during the execution of code.

43.5.1. Assignment #. An assignment of a value to a PL/pgSQL variable is written as: variable { := | = } expression ; As explained previously, the expression in such a statement is evaluated by means of an SQL SELECT command sent to the main database engine. The expression must yield a single value (possibly a row value, if the variable is a ...

A variable of a composite type is called a row variable (or row-type variable). Such a variable can hold a whole row of a SELECT or FOR query result, so long as that query's column set matches the declared type of the variable.

First, specify the name of the variable. It is a good practice to assign a meaningful name to a variable. For example, instead of naming a variable i you should use index or counter. Second, associate a specific data type with the variable. The data type can be any valid data type such as integer, numeric, varchar, and char.

You might need to use variables in PostgreSQL. You can declare your variables using DECLARE in the PL/SQL.

The optional topic parameter (defaulting to commands) selects which part of psql is explained: commands describes psql 's backslash commands; options describes the command-line options that can be passed to psql; and variables shows help about psql configuration variables.

This article covers how stored procedures can make use of variables to be more functional and useful. After defining PL/pgSQL, stored procedures, and variables, it provides examples of how variables can be used.

In PostgreSQL, a variable is a meaningful name for a memory location that holds a value that can be changed throughout a block or function. A variable is always associated with a particular data type. Before using a variable, you must declare it in the declaration section of a PostgreSQL Block. Let us better understand the Variables in ...

In case if you still want to use a variable instead of 'some value' (e.g. to re-use it in multiple queries), you can put it like this: select col1, col2, :'my_var' from mytable; - note the single quotes, otherwise it will fail if the value is not alphanumeric word.

So there are times that you need to run a raw postgres script that contains variables, on a simple sql script execution window — for example in pgadmin script window.

In this tutorial, you will learn how to use the PL/pgSQL SELECT INTO statement to select data from the database and assign it to a variable.

You will learn about the PL/pgSQL record types that allow you to define variables that can hold a sinle row of a result set.

Code language: PostgreSQL SQL dialect and PL/pgSQL (pgsql) Default values PL/SQL allows you to set a default value for a variable at the declaration time. To assign a default value to a variable, you use the assignment operator ( :=) or the DEFAULT keyword. The following example declares a variable named l_product_name with an initial value ...

You cannot use SET to assign a variable. That's taken to be the SQL command SET for setting run-time parameters. But you can assign a variable at declaration time, even use a subquery for that. @a_horse_with_no_name already wrote about naming conflicts. Using a clean format goes a long way when debugging code ...

Assignment Operators. Assignment operators are used to assign values to variables. Assignment (=): Assigns a value to a variable. Example: x = 5 # Assigns the value 5 to the variable x; Augmented Assignment Operators. Augmented assignment operators combine an arithmetic operation with an assignment. They provide a shorthand way to update the ...

4 I'm trying to set value of a variable based on case statement and return the data as a table in Postgres function.