PostgreSQL Documentation 16 43 3 Declarations
A variable s default value is evaluated and assigned to the variable each time the block is entered not just once per function call So for example assigning now to a variable of type timestamp causes the variable to have the time of the current function call not the time when the function was precompiled Examples
Postgresql Use psql set variable in a function Database , As an alternative to prefixing all objects with the schema qualifier SCH variable you may assign search path so that it happens automatically CREATE SCHEMA SCH SET search path TO SCH After this all CREATE statements and type lookups happen in SCH Concerning queries inside the bodies of functions by default they still use whatever is the search path at run time but this can
PL pgSQL Function Parameter Modes IN OUT and INOUT PostgreSQL Tutorial
Summary PL pgSQL support three parameter modes in out and intout By default a parameter takes the in mode Use the in mode if you want to pass a value to the function Use the out mode if you want to return a value from a function
PL pgSQL Variables PostgreSQL Tutorial, Introduction to variables in PL pgSQL A variable is a meaningful name of a memory location A variable holds a value that can be changed through the block A variable is always associated with a particular data type Before using a variable you must declare it in the declaration section of the PL pgSQL block
PostgreSQL Documentation 16 43 5 Basic Statements
PostgreSQL Documentation 16 43 5 Basic Statements, 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 row or record variable
Getting Started With Postgres Functions In PL Python
How to use a postgres variable in the select clause
How to use a postgres variable in the select clause PostgreSQL isn t as flexible in where and how it allows usage of variables The closest thing for what you re trying to accomplish likely would be surrounding it in a DO block like so DO DECLARE foo TEXT BEGIN foo bar SELECT foo END Note this is context dependent and you can find more information in this StackOverflow answer
Metabase Variable Filters For Postgres Get Help Metabase Discussion
SQL Functions with Variable Numbers of Arguments 38 5 7 SQL Functions with Default Values for Arguments 38 5 8 SQL Functions as Table Sources 38 5 9 SQL Functions Returning Sets 38 5 10 SQL Functions Returning TABLE 38 5 11 Polymorphic SQL Functions 38 5 12 SQL Functions with Collations 38 5 Query Language SQL Functions PostgreSQL. In PostgreSQL a variable is a meaningful name for a memory location A variable holds a value that can be changed through the 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 the PostgreSQL Block 2 Answers Sorted by 14 You can not access a environment variable directly but you can access a custom configuration setting and set that to a value from the environment at startup For example you can pass the follow startup option using PGOPTIONS PGOPTIONS c custom some string SOME STRING Note the dot in the name is important
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