無法將參數傳遞給存儲過程

Question

我要求計算日，月和年金額的總和。 我寫了如下存儲過程。

DELIMITER $$

CREATE DEFINER=`ntc`@`%` PROCEDURE `AgentRank`(IN Agentid int)

BEGIN
    select (select  @DayAmount := sum(AmountRecevied) as Totoalamountperday from 
        collection_master  
        where  AgentID=Agentid and  day(Date_Time)= day(CURRENT_DATE()) 
        group by AgentID
    ) as Dayamount,

    (select  @MonthAmount :=sum(AmountRecevied) as Totoalamountperday  from 
        collection_master
        where  AgentID=Agentid and date_time between DATE_FORMAT(NOW() ,'%Y-%m-01') and LAST_DAY(now() - interval 0 month )
        group by AgentID
    ) as monthamount,

    (select   @YearAmount := sum(AmountRecevied) as Totoalamountpermonth  from 
        collection_master  
        where AgentID=Agentid  and year(Date_Time) =YEAR(CURRENT_DATE())
        group by AgentID
    ) as yearamount,

    (select @Position := @Position + 1 AS Rank  from 
        collection_master ,(SELECT @Position := 0) r
        where AgentID=Agentid
        group by AgentID
    ) as position;

END

當我執行存儲過程時，我的輸出低於輸出

當我在存儲過程的單個查詢中執行時，我得到如下正確的輸出

請檢查一次，哪里出了錯？

Answer 1

這是存儲過程的前幾行：

CREATE DEFINER=`ntc`@`%` PROCEDURE `AgentRank`(IN Agentid int)
BEGIN
    select (select  @DayAmount := sum(AmountRecevied) as Totoalamountperday
            from collection_master  
            where  AgentID=Agentid and  day(Date_Time)= day(CURRENT_DATE()) 
-------------------^
            group by AgentID
           ) as Dayamount,

指向表達是一種重言式 。 也就是說，它正在將列AgentId與自身進行比較。 問題在於您的參數與列具有相同的名稱，不好，不好，不好，不好的主意。 解決方法：

CREATE DEFINER=`ntc`@`%` PROCEDURE `AgentRank`(IN v_Agentid int)
BEGIN
    select (select  @DayAmount := sum(AmountRecevied) as Totoalamountperday
            from collection_master  
            where AgentID = v_Agentid and day(Date_Time)= day(CURRENT_DATE()) 
           ) as Dayamount,

另請注意，您不需要聚合。 子查詢必須返回零或一行（否則會出現錯誤）。 您僅選擇一個AgentId ，因此請刪除group by以防止誤解。