SQL查询：插入，如果不是已经存在从2表

Question

我想插入行，如果它们不存在（对于特定值）在此表中。

我的表，其中我插入是insertTable：

date (date) 
created (datetime) 
category (varchar) 
companyId (int) 
price (decimal 6,3) 

我从内选择我行的两个表之间做加盟：

declare @currentDateTime datetime = getDate() 
declare @currentDate date = getDate() 
INSERT INTO insertTable (date, created, category, companyId, price) 
SELECT @currentDate, @currentDateTime, '30 Day', company.companyId, product.price 
FROM product 
INNER JOIN company 
ON product.companyid = company.companyid 
WHERE product.price >= 0.31 AND ... other conditions on company fields ... 
AND NOT EXISTS(
     SELECT * FROM insertTable WHERE insertTable.price = product.price 
        AND insertTable.date = @currentDateTime 
        AND insertTable.companyid = product.companyid 
        AND LTRIM(RTRIM(insertTable.category)) = '30 Day' 
    ) 

什么我做错了吗？

谢谢

- 戈登Linoff后编辑评论。 我在insertTable中插入了select的结果。 我的问题是，我得到insertTable中的重复。

如果insertTable有

2014-09-26 | 2014-09-26 02:25:00 | 30 Day | 32650 | 0.600 

我的选择将返回像

2014-09-26 | 2014-09-26 02:36:00 | 30 Day | 32650 | 0.600 

东西但是我已经有companyID和价格在插入表

Answer 1

您的问题声明不能准确
费率未定义

你缺少创建
和您比较日期@currentDateTime

SELECT @currentDate, @currentDateTime, '30 Day' 
    , company.companyId, product.price 
    FROM product 
    JOIN company 
    ON product.companyid = company.companyid 
    and product.price >= 0.31 AND ... other conditions on company fields ... 
AND NOT EXISTS(
       SELECT * 
       FROM insertTable 
       WHERE insertTable.date = @currentDate 
       --AND insertTable.created = @currentDateTime 
        AND insertTable.price = product.price 
        AND insertTable.companyid = product.companyid 
        AND LTRIM(RTRIM(insertTable.category)) = '30 Day' 
       ) 

Answer 2

我不认为你可以这样使用EXISTS函数。我想你可能需要对insertTable表执行一个LEFT JOIN，然后在你的WHERE子句中添加一个“iT.Price IS NULL”。 （这是假设的价格是从来没有真正对你insertTable NULL）。

Answer 3

我认为你必须修改你的子查询中NOT EXISTS：@currentDateTime变化@currentDate和rate.companyid变化company.companyid（因为当插入insertTable.date得到的@currentDate和insertTable.companyid价值得到的价值company.companyid）：

... 
AND NOT EXISTS(
     SELECT * FROM insertTable WHERE insertTable.price = product.price 
        AND insertTable.date = @currentDate 
        AND insertTable.companyid = company.companyid 
        AND LTRIM(RTRIM(insertTable.category)) = '30 Day' 
    ) 

Answer 4

您需要关联的子查询，而不是子查询中的连接。

它甚至更好地使用MERGE声明http://msdn.microsoft.com/en-us/library/bb510625.aspx

declare @currentDateTime datetime = getDate() 
declare @currentDate date = getDate() 
INSERT INTO insertTable (date, created, category, companyId, price) 
SELECT @currentDate, @currentDateTime, '30 Day', company.companyId, product.price 
FROM product 
INNER JOIN company 
ON product.companyid = company.companyid 
WHERE product.price >= 0.31 AND ... other conditions on company fields ... 
AND NOT EXISTS(
     SELECT 1 FROM insertTable WHERE insertTable.price = product.price 
        AND insertTable.date = @currentDate 
        AND insertTable.companyid = company.companyid 
        AND LTRIM(RTRIM(insertTable.category)) = '30 Day' 
    ) 

编辑：

你可以做同样的MERGE像下面

MERGE insertTable as target 
USING (SELECT @currentDate, 
      @currentDateTime, 
       '30 Day', 
       company.companyId, 
       product.price 
     FROM INNER JOIN company 
    ON product.companyid = company.companyid 
    WHERE product.price >= 0.31 AND ... other conditions on company fields ... 
) as source (currentDate, currentDateTime, category, companyid, price) 
ON target.price = source.price 
AND target.date = source.currentDate 
and target.companyid = source.companyid 
and LTRIM(RTRIM(target.category)) = '30 Day' 
WHEN NOT MATCHED THEN 
    INSERT (date, created, category, companyId, price) 
    VALUES (source.currentDate, source.currentDatetime, source.category, source.companyId, source.price)