mysql的變量數不增加

我有以下MySQL查詢：mysql的變量數不增加

SET @sum1 = 0; 
SELECT (@sum1 := @sum1 + 1),date_clicked 
FROM `documents_clicks_or_downloads` dclick 
JOIN `documents_repository` drep ON dclick.documentID = drep.ID 
WHERE accountID = 2304 
ORDER BY dclick.ID ASC

下面是我得到的結果：

"(@sum1 := @sum1 + 1)" "date_clicked" 
"1" "2014-04-04" 
"2" "2014-04-04" 
"3" "2014-04-04" 
"4" "2014-04-04" 
"5" "2014-04-04" 
"6" "2014-04-04" 
"7" "2014-04-04" 
"8" "2014-04-04" 
"9" "2014-04-04" 
"10" "2014-04-04" 
"11" "2014-04-04" 
"12" "2014-04-04" 
"13" "2014-04-04" 
"14" "2014-04-04" 
"15" "2014-04-04" 
"16" "2014-04-04" 
"17" "2014-04-04" 
"18" "2014-04-04" 
"19" "2014-04-04" 
"20" "2014-04-04" 
"21" "2014-04-04" 
"22" "2014-04-04" 
"23" "2014-04-04" 
"24" "2014-04-04" 
"33" "2014-04-04" 
"34" "2014-04-04" 
"35" "2014-04-04" 
"36" "2014-04-04" 
"37" "2014-04-04" 
"38" "2014-04-04" 
"39" "2014-04-04" 
"40" "2014-04-04" 
"41" "2014-04-04" 
"42" "2014-04-04" 
"43" "2014-04-04" 
"44" "2014-04-04" 
"45" "2014-04-04" 
"46" "2014-04-04" 
"47" "2014-04-04" 
"48" "2014-04-04" 
"49" "2014-04-04" 
"50" "2014-04-04" 
"51" "2014-04-04" 
"52" "2014-04-04" 
"53" "2014-04-04" 
"54" "2014-04-04" 
"25" "2014-04-04" 
"26" "2014-04-04" 
"27" "2014-04-04" 
"55" "2014-04-04" 
"56" "2014-04-04" 
"57" "2014-04-04" 
"28" "2014-04-04" 
"29" "2014-04-05" 
"58" "2014-04-05" 
"30" "2014-04-06" 
"31" "2014-04-06" 
"59" "2014-04-06" 
"61" "2014-04-07" 
"62" "2014-04-07" 
"63" "2014-04-07" 
"64" "2014-04-07" 
"65" "2014-04-07" 
"66" "2014-04-07" 
"67" "2014-04-07" 
"68" "2014-04-07" 
"69" "2014-04-07" 
"70" "2014-04-07" 
"71" "2014-04-07" 
"72" "2014-04-07" 
"73" "2014-04-07" 
"74" "2014-04-07" 
"75" "2014-04-07" 
"76" "2014-04-07" 
"77" "2014-04-07" 
"87" "2014-04-07" 
"88" "2014-04-07" 
"89" "2014-04-07" 
"90" "2014-04-07" 
"91" "2014-04-07" 
"92" "2014-04-07" 
"93" "2014-04-07" 
"94" "2014-04-07" 
"95" "2014-04-07" 
"96" "2014-04-07" 
"97" "2014-04-07" 
"98" "2014-04-07" 
"99" "2014-04-07" 
"100" "2014-04-07" 
"101" "2014-04-07" 
"102" "2014-04-07" 
"103" "2014-04-07" 
"104" "2014-04-07" 
"105" "2014-04-07" 
"106" "2014-04-07" 
"107" "2014-04-07" 
"78" "2014-04-07" 
"79" "2014-04-07" 
"108" "2014-04-07" 
"109" "2014-04-07"

所以現在的問題是，爲什麼我沒有得到正確的數字增加在總和列上？它似乎跳到各地，我不知道爲什麼。謝謝。

來源

2015-05-06 Antony

問題是選擇發生在排序之前。

嘗試做它作爲一個子查詢，而不是：

SET @sum1 = 0; 
SELECT (@sum1 := @sum1 + 1), t.* 
FROM (
    SELECT 
    date_clicked 
    FROM `documents_clicks_or_downloads` dclick 
    JOIN `documents_repository` drep ON dclick.documentID = drep.ID 
    WHERE accountID = 2304 
    ORDER BY dclick.ID ASC 
) t

來源

2015-05-06 15:08:51 Nixxxon

超級謝謝！我試過它作爲一個子查詢，但我仍然在內部查詢而不是外部完成+1，因爲我也想按日期進行分組。原來兩者都可以在室外完成。 – Antony

mysql的變量數不增加

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