You cannot declare a variable in plain SQL like this. In place of columnname if I replace with the variable i.e. Table 8-1 shows all the built-in general-purpose data types. Variable initialization timing. I have to declare variable inside a function for internal calculation. See: User defined variables in PostgreSQL; There is a DECLARE command, but it's for cursors - a completely different feature.. You seem to be confusing this with plpgsql code where each block can have a leading DECLARE section, but BEGIN TRANSACTION or COMMIT are not possible inside plpgsql.. character type in postgresql . I tried to do this as an edit, but the edit was rejected as being too small. DECLARE variablename character varying; Permalink Posted 1-Mar-16 1:14am. gives the value of the column name specified. Bit String Types are used to store bit masks. @DaoLam: From the documentation I liked to: "The result of a SQL command yielding a single row (possibly of multiple columns) can be assigned to a record variable, row-type variable, or list of scalar variables." character varying(n), varchar(n) = variable-length with limit; character(n), char(n) = fixed-length, blank padded; text = variable unlimited length; based on your problem I suggest you to use type text. PostgreSQL evaluates the default value of a variable and assigns it to the variable when the block is entered. PostgreSQL has a rich set of native data types available to users. Most of the alternative names listed in the "Aliases" column are the names used internally by PostgreSQL for historical reasons. Both of these types can store strings up to n characters (not bytes) in length. There are some issues related to implementation and simple and good enough solution is ignore this type feature - the expected behave is simple with varchar, but can be pretty difficult to design correct and user friendly behave for numeric types. Users can add new types to PostgreSQL using the CREATE TYPE command. The delimiter character is usually a comma (,) but can be something else: it is determined by the typdelim setting for the array's element type. Among the standard data types provided in the PostgreSQL distribution, all use a comma, except for type box, which uses a semicolon (;). the type does not require character length. vSite := 'TechOnTheNet.com'; The type of payment is numeric and its value is initialized to 20.5. Text Search Type. I am newbie to postgresql. amit.agarwal8609. Below is an example of how to declare a variable in PostgreSQL called vSite.. Example - Declaring a variable. Bit String Type. I will define the columname in a variable: var := columnname. recordvar. They are either 0 or 1. There are two SQL bit types: bit(n) and bit varying(n), where n is a positive integer. – mu is too short Mar 5 '15 at 20:35 Table 8-4 shows the general-purpose character types available in PostgreSQL.. SQL defines two primary character types: character varying(n) and character(n), where n is a positive integer. This type supports full text search, which is the activity of searching through a collection of natural-language documents to locate those that best match a query. So it's not entirely clear what you are … The counter variable is an integer that is initialized to 1. From historical reasons PostgreSQL ignore size modificator in function argument type (typmod). Add a Solution < > & [^] … ? The first_name and last_name are varchar(50) and initialized to 'John' and 'Doe' string constants.. I have a Postgres schema which looks like: The problem is that whenever I save text longer than 500 characters in the description column I get the error: value too long for type character varying(500) In the documentation for Postgres it says type text can have unlimited characters. ... You can declare the variable by the following line in your procedure/function. DECLARE vSite varchar; This example would declare a variable called vSite as a varchar data type.. You can then later set or change the value of the vSite variable, as follows:. The problem you're running into is a misunderstanding of plpgsql's (somewhat confusing) block syntax.If you look on that page, the critical part you're missing is this: columnname. Using PostgreSQL, column values from a table for 1st record are stored in a record variable. I'm using postgresql … for ex: let the variable be: recordvar. Postgresql for historical reasons function argument type ( typmod ) Posted 1-Mar-16 1:14am to 20.5 function type! 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