MySQL - 無法使用SET變量創建視圖

Question

我試圖用SET @rank = 0;創建一個視圖，但它給了我錯誤。一直嘗試不同的事情，但它不工作。任何人都可以請我指出正確的方向？

CREATE VIEW S1_Bottom_Performer_AHT as (
SET @rank=0 
SELECT @rank := @rank+1 AS '#', 
       ei.SM, 
       ei.TM, 
       es.Month_Date, 
       ei.emp_id, 
       ei.DNAME, 
       ei.STATUS, 
       ei.SHIFT, 
       ei.SKILL, 
       ei.HIRE_DATE, 
       ifnull(TIMESTAMPDIFF(MONTH, ei.HIRE_DATE, now()), '-') AS Tenure, 
       ifnull(es.Call_Handled, '-') AS Call_Handled, 
       ifnull(es.AHT, '-') AS AHT 
FROM mtl_extended_info ei 
LEFT OUTER JOIN 
    (SELECT es.Employee_ID, 
      es.Month_Date, 
      sum(es.Calls_Handled_Ct) AS Call_Handled, 
      round((sum(es.I_Talk_Time_Sec) + sum(es.Hold_Time_Sec) + sum(es.I_Work_Time_Sec) + sum(es.I_AUX_Out_Time_Sec))/sum(es.Calls_Handled_Ct)) AS AHT 
    FROM cdl_agent_call_voume_gen es 
    WHERE es.Month_Date = '2013-09-01' 
    GROUP BY es.Employee_ID, 
      es.Month_Date) es ON es.Employee_ID = ei.emp_id 
WHERE es.Month_Date = '2013-09-01' 
    AND ei.Visible = 1 
    AND ei.SKILL != 'RSD' 
GROUP BY ei.emp_id 
ORDER BY es.AHT DESC LIMIT 80); 

錯誤消息：

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'SET @rank=0 
SELECT @rank := @rank+1 AS '#', 
       ei.SM, 
      ' at line 2 

Answer 1

我認爲你不能做到這一點。

由於從MYSQL guidelines：

A view definition is subject to the following restrictions:

[ deletia ]

The SELECT statement cannot refer to system or user variables.

Answer 2

視圖是SELECT語句，僅此而已。視圖不能是多個語句。如果您無法將此視圖歸爲單個語句，請嘗試使用建議here以使用函數或過程。

嘗試this建議MYSQL使用聯接而不是一組。

JOIN (SELECT @rank:= 0) r; 

這是一個未經測試的例子，我不知道，如果你可以通過「＃」末訂貨，但如果你能會正確地排序排列的一切：

CREATE VIEW S1_Bottom_Performer_AHT as (
SELECT @rank := @rank+1 AS '#', * 
FROM 
(SELECT   ei.SM, 
       ei.TM, 
       es.Month_Date, 
       ei.emp_id, 
       ei.DNAME, 
       ei.STATUS, 
       ei.SHIFT, 
       ei.SKILL, 
       ei.HIRE_DATE, 
       ifnull(TIMESTAMPDIFF(MONTH, ei.HIRE_DATE, now()), '-') AS Tenure, 
       ifnull(es.Call_Handled, '-') AS Call_Handled, 
       ifnull(es.AHT, '-') AS AHT 
FROM mtl_extended_info ei 
LEFT OUTER JOIN 
    (SELECT es.Employee_ID, 
      es.Month_Date, 
      sum(es.Calls_Handled_Ct) AS Call_Handled, 
      round((sum(es.I_Talk_Time_Sec) + sum(es.Hold_Time_Sec) + sum(es.I_Work_Time_Sec) + sum(es.I_AUX_Out_Time_Sec))/sum(es.Calls_Handled_Ct)) AS AHT 
    FROM cdl_agent_call_voume_gen es 
    WHERE es.Month_Date = '2013-09-01' 
    GROUP BY es.Employee_ID, 
      es.Month_Date) es ON es.Employee_ID = ei.emp_id 
WHERE es.Month_Date = '2013-09-01' 
    AND ei.Visible = 1 
    AND ei.SKILL != 'RSD' 
GROUP BY ei.emp_id 
ORDER BY es.AHT DESC LIMIT 80) 
) AS RESULTS 
JOIN (SELECT @rank:= 0) r; 
ORDER BY '#'