CREATE FUNCTION defines a new function. CREATE OR REPLACE FUNCTION will either create a new function, or replace an existing definition. To be able to define a function, the user must have the USAGE privilege on the language. If a schema name is...
Thefib_cached()function defined from lines 6-28 introduces quite a bit more syntax. The first line with something new is line five'sDECLAREstatement. As you may have ascertained by the previous discussion of argument aliases, this statement introduces a block for declaring variables for use in ...
The first line uses PostgreSQL's CREATE OR REPLACE FUNCTION statement to create the function. The name of the function is fib. The CREATE OR REPLACE FUNCTION statement is more useful in practice than the simple CREATE FUNCTION statement...
{ CREATE | ALL [ PRIVILEGES ] } ON TABLESPACE tablespace_name [, ...] TO { username | GROUP group_name | PUBLIC } [, ...] [ WITH GRANT OPTION ] GRANT { EXECUTE | ALL [ PRIVILEGES ] } ON FUNCTION func_name ([type, ...]) [, ...] TO { username | GROUP group_name | ...
-- Alternative syntax for string literal: CREATE FUNCTION one() RETURNS integer AS ' SELECT 1 AS result; ' LANGUAGE SQL; SELECT one(); -- 返回空 CREATE FUNCTION clean_emp() RETURNS void AS ' DELETE FROM emp WHERE salary < 0;
Syntax: [ WITH [ RECURSIVE ] with_query [, ...] ] SELECT [ ALL | DISTINCT [ ON ( expression [, ...] ) ] ] [ * | expression [ [ AS ] output_name ] [, ...] ] [ FROM from_item [, ...] ] [ WHERE condition ] ...
我正在PostgreSQL中创建一个用户定义的函数,并且面临错误。 另外,请建议一个更好的方法(如果有的话)来执行这个功能。 CREATE FUNCTION public.mark_enrollment_completed(IN enrollment_id text) RETURNS boolean LANGUAGE plpgsql AS $BODY$ DECLARE total_contents INTEGER; ...
variables show help on special variables \h [NAME] help on syntax of SQL commands, * for all commandsQuery Buffer \e [FILE] [LINE] edit the query buffer (or file) with external editor \ef [FUNCNAME [LINE]] edit function definition with external editor...Informational (o...
{ "syntax_error_or_access_rule_violation", ERRCODE_SYNTAX_ERROR_OR_ACCESS_RULE_VIOLATION }, { "syntax_error", ERRCODE_SYNTAX_ERROR }, { "insufficient_privilege", ERRCODE_INSUFFICIENT_PRIVILEGE }, { "cannot_coerce", ERRCODE_CANNOT_COERCE }, { "grouping_error", ERRCODE_GROUPING_ERROR }, {...
Command:CREATETRIGGERDescription:define anewtriggerSyntax:CREATE[CONSTRAINT]TRIGGERname{BEFORE|AFTER|INSTEADOF}{event[OR...]}ONtable_name[FROMreferenced_table_name]{NOTDEFERRABLE|[DEFERRABLE]{INITIALLYIMMEDIATE|INITIALLYDEFERRED}}[FOR[EACH]{ROW|STATEMENT}][WHEN(condition)]EXECUTEPROCEDUREfunction_name(argume...