COUNT（DISTINCT（在尋找函數而不是列的情況下？

Question

好。 我要放棄這一點。

當我運行以下查詢時，出現“錯誤代碼：1305。FUNCTIONstatpurchase.playerId不存在”。 我沒有行號，但我強烈懷疑COUNT（DISTINCT（WHEN子句。

該查詢正在嘗試計算在給定的時間內進行購買的唯一玩家ID的百分比。 statpurchase.playerId是有效的列名。

這是一個可憐的人，責怪他的工具，但我懷疑它可能是類似於此錯誤的解析器錯誤。

delimiter $$
CREATE PROCEDURE `percentUniquesPurchasing`(in startTime datetime, in endTime datetime, in placeId int)
BEGIN

declare total_uniques int;
declare iOS_uniques int;
declare desktop_uniques int;
declare i datetime;
set i = startTime;

CREATE TEMPORARY TABLE results (
    theday datetime, 
    total float,
    iOS float,
    desktop float
);



while(i < endTime + INTERVAL 1 DAY) do



    select count(distinct(statplaysession.playerId)), 
        count(distinct(case when touchInterface = 1 then statplaysession.playerId else null end)),
        count(distinct(case when touchInterface = 0 then statplaysession.playerId else null end))
    into
        total_uniques, iOS_uniques, desktop_uniques
    from rbxstats.statplaysession 
    where
        statplaysession.start > i and
        statplaysession.start < i + INTERVAL 1 DAY and
        statplaysession.placeId = placeId;

    insert into results (theday, total, iOS, desktop) 
    select i, 
            if(total_uniques > 0, count(distinct(statpurchase.playerId)) / total_uniques, 0), 
            if(iOS_uniques > 0, count(distinct(statpurchase.playerId(case when touchInterface = 1 then statpurchase.playerId end))) / iOS_uniques, 0), 
            if(desktop_uniques > 0, count(distinct(statpurchase.playerId(case when touchInterface = 0 then statpurchase.playerId end))) / desktop_uniques,0)
    from rbxstats.statpurchase where
        statpurchase.timestamp > i and
        statpurchase.timestamp < i + INTERVAL 1 DAY and
        statpurchase.placeId = placeId;


    set i = i + INTERVAL 1 DAY;
end while;

select * from results;
drop temporary table results;
END$$

Answer 1

在這兩行中，您嘗試將statpurchase.playerId用作一個函數（看起來似乎不是），它是表中的一列

 if(iOS_uniques > 0, count(distinct(statpurchase.playerId(case when 
 if(desktop_uniques > 0, count(distinct(statpurchase.playerId(case when