SQL查詢：插入，如果不是已經存在從2表

Question

我想插入行，如果它們不存在（對於特定值）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) 

我從內選擇我行的兩個表之間做加盟：

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' 
    ) 

什麼我做錯了嗎？

謝謝

- 戈登Linoff後編輯評論。 我在insertTable中插入了select的結果。 我的問題是，我得到insertTable中的重複。

如果insertTable有

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

我的選擇將返回像

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

東西但是我已經有companyID和價格在插入表

Answer 1

您的問題聲明不能準確
費率未定義

你缺少創建
和您比較日期@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

我不認爲你可以這樣使用EXISTS函數。我想你可能需要對insertTable表執行一個LEFT JOIN，然後在你的WHERE子句中添加一個「iT.Price IS NULL」。 （這是假設的價格是從來沒有真正對你insertTable NULL）。

Answer 3

我認爲你必須修改你的子查詢中NOT EXISTS：@currentDateTime變化@currentDate和rate.companyid變化company.companyid（因爲當插入insertTable.date得到的@currentDate和insertTable.companyid價值得到的價值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

您需要關聯的子查詢，而不是子查詢中的連接。

它甚至更好地使用MERGE聲明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' 
    ) 

編輯：

你可以做同樣的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)