SQL INSERT值不存在

Question

我想這個查詢插入所有不同網店日期到第二個表，如果他們不存在對網絡商店的DataSet

下面的查詢似乎忽略AND t1.[DataSet] = 'webshop'參數並且不插入新的webshop值，因爲它們包含相同的日期範圍，即。它們都包含01/02/2013

INSERT INTO [ImportedDateRange] ([DataSet],[DateRange]) 
select DISTINCT 'webshop', cast(T2.[OrderCreatedDate] as DATE) 
from webshop T2 
left join [ImportedDateRange] T1 
on cast(T2.[OrderCreatedDate] as DATE) = t1.[DateRange] 
where t1.[DateRange] is null 
AND t1.[DataSet] = 'webshop' 

期望的結果是，它輸入所述網絡商店的日期範圍，只有當他們不已經存在的網絡商店（如果查詢運行兩次這個防止重複數據）

DataSet DataRange 
business 01/02/2013 
business 02/02/2013 
business 03/02/2013 
webshop 01/02/2013 
webshop 02/02/2013 
webshop 03/02/2013 

Answer 1

你應該將t1.[DataSet] = 'webshop'條件從WHERE類

INSERT INTO [ImportedDateRange] ([DataSet],[DateRange]) 
select DISTINCT 'webshop', cast(T2.[OrderCreatedDate] as DATE) 
from webshop T2 
left join [ImportedDateRange] T1 
on cast(T2.[OrderCreatedDate] as DATE) = t1.[DateRange] 
     AND t1.[DataSet] = 'webshop' 
where t1.[DateRange] is null