將行插入表中，其中的值不在列

Question

我有一個表，有三列：Day,Key,Value。如果從Key列缺席的值，我希望能夠將其插入：

DAY | KEY | VALUE 
------------------ 
Mon Run 50  
Mon Bike 20 
Tues Run 25 
Tues Bike 60 
Wed Run 20 
Wed Swim 5 

我希望能夠與來自塔失蹤「自行車」值，以確定該行並將其插入。所以會有一個額外的行

Wed Bike 20 

我應該如何去實現這一目標？

Answer 1

你能試試嗎？這是硬編碼的方法：

INSERT INTO <yourtable> (day, key, value) 
SELECT DISTINCT t1.day AS day, 'Bike' as key, 20 as value 
FROM 
    <yourtable> AS t1 
    LEFT OUTER JOIN 
    (SELECT day, key FROM <yourtable> WHERE key='Bike') AS t2 
    ON t1.day = t2.day 
WHERE t2.key IS NULL; 

或者如果可以的話，請用存儲過程（這將讓你選擇的活動和值：

CREATE PROCEDURE dbo.InsertActivityWhereMissing 
     @activity VARCHAR(50) 
    , @activityValue INT 
AS 
BEGIN 
    INSERT INTO <yourtable> (day, key, value) 
    SELECT t1.day AS day, @activity as key, @activityValue as value 
    FROM 
     (SELECT day FROM <yourtable> GROUP BY day) AS t1 
     LEFT OUTER JOIN 
     (SELECT day, key FROM <yourtable> WHERE key = @activity) AS t2 
     ON t1.day = t2.day 
    WHERE t2.key IS NULL; 
END 

這樣，您就可以執行相同的對於任何特定"activity"（我只是冠名這樣的說法，但我指的是Run，Bike，Swim或其他任何東西）