postgresql function declare
Parameters passed to functions are named with the identifiers $1 , $2 , etc. Optionally, aliases can be declared for $ n parameter names for increased readability. ,When a PL/pgSQL function is declared with output parameters, the output parameters are given $n names and optional aliases in just the same way as the normal input parameters. An output parameter is effectively a variable that starts out NULL; it should b,The name of an output column in the RETURNS TABLE syntax. This is effectively another way of declaring a named OUT parameter, except that RETURNS TABLE ... ,When a PL/pgSQL function is declared with output parameters, the output parameters are given $n names and optional aliases in just the same way as the normal input parameters. An output parameter is effectively a variable that starts out NULL; it should b,CREATE FUNCTION sales_tax(real) RETURNS real AS $$ DECLARE subtotal ALIAS FOR $1; BEGIN RETURN subtotal * 0.06; END; $$ LANGUAGE plpgsql;. ,CREATE FUNCTION sales_tax(real) RETURNS real AS $$ DECLARE subtotal ALIAS FOR $1; BEGIN RETURN subtotal * 0.06; END; $$ LANGUAGE plpgsql;. ,The name of an output column in the RETURNS TABLE syntax. This is effectively another way of declaring a named OUT parameter, except that RETURNS TABLE ... ,Postgresql historically doesn't support procedural code at the command level - only within functions. However, in Postgresql 9, support has been added to ... ,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 PL/pgSQL block. The following illustrat,CREATE [OR REPLACE] FUNCTION function_name (arguments) RETURNS return_datatype AS $variable_name$ DECLARE declaration; [...] BEGIN < ...
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 postgresql function declare 相關參考資料
Documentation: 11: 43.3. Declarations - PostgreSQL
Parameters passed to functions are named with the identifiers $1 , $2 , etc. Optionally, aliases can be declared for $ n parameter names for increased readability. https://www.postgresql.org Documentation: 9.0: Declarations - PostgreSQL
When a PL/pgSQL function is declared with output parameters, the output parameters are given $n names and optional aliases in just the same way as the normal input parameters. An output parameter is e... https://www.postgresql.org Documentation: 9.1: CREATE FUNCTION - PostgreSQL
The name of an output column in the RETURNS TABLE syntax. This is effectively another way of declaring a named OUT parameter, except that RETURNS TABLE ... https://www.postgresql.org Documentation: 9.1: Declarations - PostgreSQL
When a PL/pgSQL function is declared with output parameters, the output parameters are given $n names and optional aliases in just the same way as the normal input parameters. An output parameter is e... https://www.postgresql.org Documentation: 9.3: Declarations - PostgreSQL
CREATE FUNCTION sales_tax(real) RETURNS real AS $$ DECLARE subtotal ALIAS FOR $1; BEGIN RETURN subtotal * 0.06; END; $$ LANGUAGE plpgsql;. https://www.postgresql.org Documentation: 9.4: Declarations - PostgreSQL
CREATE FUNCTION sales_tax(real) RETURNS real AS $$ DECLARE subtotal ALIAS FOR $1; BEGIN RETURN subtotal * 0.06; END; $$ LANGUAGE plpgsql;. https://www.postgresql.org Documentation: 9.5: CREATE FUNCTION - PostgreSQL
The name of an output column in the RETURNS TABLE syntax. This is effectively another way of declaring a named OUT parameter, except that RETURNS TABLE ... https://www.postgresql.org How to declare local variables in postgresql? - Stack Overflow
Postgresql historically doesn't support procedural code at the command level - only within functions. However, in Postgresql 9, support has been added to ... https://stackoverflow.com PLpgSQL Variables - PostgreSQL Tutorial
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... https://www.postgresqltutorial PostgreSQL函數- PostgreSQL基礎教程 - 極客書
CREATE [OR REPLACE] FUNCTION function_name (arguments) RETURNS return_datatype AS $variable_name$ DECLARE declaration; [...] BEGIN < ... http://tw.gitbook.net |