刪除以PK爲參數的行的函數

Question

我想根據主鍵bill_key創建一個沒有返回值的函數來刪除名爲bill的表中的記錄。該列被稱爲bill_key。我的代碼是：

CREATE OR REPLACE FUNCTION public.delete_bill(bill_key_to_delete bigint) 
RETURNS void AS 
$BODY$ 
begin 
    DELETE FROM bill 
    WHERE "bill_key" = bill_key_to_delete; 
    return; 
end; 
$BODY$ 
LANGUAGE plpgsql VOLATILE 
COST 100; 

我調用該函數：

select delete_bill(2); 

但該錯誤消息我得到的是：

select delete_bill(2) 
     ERROR: column reference "bill_key" is ambiguous 
     LINE 2: WHERE "bill_key" = bill_key_to_delete 
        ^
     DETAIL: It could refer to either a PL/pgSQL variable or a table column. 
     QUERY: DELETE FROM bill 
     WHERE "bill_key" = bill_key_to_delete 
     CONTEXT: PL/pgSQL function delete_bill(bigint) line 2 at SQL statement 

Answer 1

與別名嘗試對錶的名稱：

DELETE FROM bill b 
WHERE b."bill_key" = bill_key_to_delete; 

如果函數返回void類型，您應該使用PERFORM執行功能

PERFORM delete_bill(2);