我的查询是否正确如何在 Postgres SQL 存储过程函数中传递参数

Question

我正在努力研究 如何将参数传递给 Postgres sql 中的存储过程函数。我的查询是否正确？我收到错误 是类型日期的无效输入语法："Firstdate"。我错过了什么？请多多指教

CREATE OR REPLACE FUNCTION prisonparam(dvn_cd text,
       phc_cd  text,
       Firstdate Date,
       Seconddate Date,
       To Date) 
     RETURNS table (round text,sc bigint,scupto bigint)
     AS $$
     /* query start */
    WITH a
   AS (
       SELECT
        round AS round
       ,Sum(ben_sc) AS SC

       FROM prison_issue
       WHERE (
        DATE BETWEEN 'Firstdate'
            AND 'To'
             )
       AND dvn_cd = 'dvn_cd'
       AND phc_cd = 'phc_cd'

       GROUP BY round ORDER BY round
       )
       ,b
      AS (
     SELECT round AS round_up
     ,Sum(ben_sc) AS SC_up


     FROM prison_issue
     WHERE (
        DATE BETWEEN 'Seconddate'
            AND 'To'
           )
    AND dvn_cd = 'dvn_cd'
    AND phc_cd = 'phc_cd'
    GROUP BY round ORDER BY round
         )
   SELECT b.round_up AS round
  ,coalesce(a.sc, 0) AS SC
  ,coalesce(b.sc_up, 0) AS SCUPTO

  FROM a
  RIGHT JOIN b ON a.round = b.round_up
  /* query end*/
  $$ LANGUAGE sql;

Answer 1

不要双引号参数。

 DATE BETWEEN 'Firstdate'
        AND 'To'

正在尝试将 'Firstdate' 和 'To' 用作文字。

不要引用它们。

 DATE BETWEEN Firstdate
        AND To

或者，如果您必须使用 To 等可能有问题的标识符作为变量，则应将它们加双引号。但是如果你这样做，那么到处，包括参数声明列表。

 DATE BETWEEN Firstdate
        AND "To"

我的查询是否正确如何在 Postgres SQL 存储过程函数中传递参数

Is my query correct how to pass parameter in Postgres SQL stored procedure functions

php

postgresql

parameter-passing

stored-functions