Postgresql 错误：具有默认值的参数后面的输入参数在Postgres中也必须具有默认值

我试图将

默认值
设置为
参数
列表中
函数
中的变量，但出现错误：

错误：具有默认值的参数后面的输入参数也必须具有默认值

例子：
在你的例子中有很多不正确的地方。或者更确切地说：在你的例子中没有多少是正确的

CREATE OR REPLACE FUNCTION f_test(
     name text = NULL
   , city text = NULL
   , phonenumber text = NULL
    ,address text = NULL
   , OUT sno bigint)
RETURNS void AS
 $func$
DECLARE 
    phonenumber AS VarChar(20);  -- would collide with parameter name
BEGIN
phonenumber := phonenumber;      -- nonsense

SELECT INTO sno  max(ssno) + 1 FROM emp;  -- SELECT INTO for assignment

IF sno IS NULL THEN
  sno := ident_current('emp') + 1;
END IF;

RAISE NOTICE '%, %, %, %', name, city, phonenumber, address;

INSERT INTO emp(ename, ecity, ephonenumber, eaddress)
VALUES (name, city, phonenumber, address);

END
$func$  LANGUAGE plpgsql;
试一试

请尝试为最后两个参数设置默认值，或更改参数顺序，使具有默认值的参数成为最后一个参数。@amenadiel，+1非常感谢。太棒了！终于排除了所有的错误。非常感谢。PostgreSQL中有Ident_current（）函数吗？@Meem:没有，看起来像。
CREATE OR REPLACE FUNCTION f_test(
     name text = NULL
   , city text = NULL
   , phonenumber text = NULL
    ,address text = NULL
   , OUT sno bigint)
RETURNS void AS
 $func$
DECLARE 
    phonenumber AS VarChar(20);  -- would collide with parameter name
BEGIN
phonenumber := phonenumber;      -- nonsense

SELECT INTO sno  max(ssno) + 1 FROM emp;  -- SELECT INTO for assignment

IF sno IS NULL THEN
  sno := ident_current('emp') + 1;
END IF;

RAISE NOTICE '%, %, %, %', name, city, phonenumber, address;

INSERT INTO emp(ename, ecity, ephonenumber, eaddress)
VALUES (name, city, phonenumber, address);

END
$func$  LANGUAGE plpgsql;
CREATE OR REPLACE FUNCTION f_test(
     name text = NULL
   , city text = NULL
   , phonenumber text = NULL
   , address text = NULL
   , OUT sno bigint)
AS
$func$
BEGIN
RAISE NOTICE '%, %, %, %', name, city, phonenumber, address;

INSERT INTO emp(ename, ecity, ephonenumber, eaddress)
VALUES (name, city, phonenumber, address)
RETURNING ssno
INTO   sno;             -- Assuming you want to return autoincremented id 

END
$func$  LANGUAGE plpgsql;

Create or replace function test(
out sno bigint, 
address varchar,
name varchar default null, 
city varchar default null, 
phonenumber varchar(20) default null)
   returns void as ..