[英]I'm Getting Count of a column same for all rows?How to count occurrences of a column value efficiently in SQL?
Select
Sales_Detail.Serial_No
,Sales_Detail.Tax_Percentage
,Card_Amount
,Cash_Amount
,ISNULL((Select Count(DISTINCT Tax_Percentage) From Sales_Detail
Left Join Sales_Master ON
Sales_Master.Serial_No=Sales_Detail.Serial_No
Where Sales_Master.Invoice_Date = '14-Feb-2019'
And IsSaved='True'And IsCancelled = 'False'
And Card_Amount >0 Or Sales_Master.Cash_Amount>0
And Sales_Detail.Serial_No=10467),1) As Count_Tax
From Sales_Detail
Inner Join Item_Master On Sales_Detail.Item_ID = Item_Master.Item_ID
Inner Join Item_Brand On Item_Master.Brand_ID = Item_Brand.Brand_ID
Inner Join Sales_Master On Sales_Detail.Serial_No=Sales_Master.Serial_No
left Join Customer C on C.Customer_ID =Sales_Master.Customer_ID
Inner Join Tax On Tax.Tax_Percentage=Sales_Detail.Tax_Percentage
Where Sales_Master.Invoice_Date = '14-Feb-2019' And IsSaved = 'True'
And IsCancelled = 'False'
order by Sales_Detail.SGST_Percentage ,Tax_Percentage
从上面的查询中计数时。 我将所有行的计数都设为2。为什么会这样呢? 如果在查询中选择以上选项,则期望所有行的输出计数为2,但是实际上我想将序列号10467的计数设置为1,并将序列号10468的计数设置为2。
Select
Count(DISTINCT Tax_Percentage)
From Sales_Detail
Left Join Sales_Master ON Sales_Master.Serial_No=Sales_Detail.Serial_No
Where Sales_Master.Invoice_Date = '14-Feb-2019'
And IsSaved='True'And IsCancelled = 'False'
And Card_Amount >0 Or Sales_Master.Cash_Amount>0
And Sales_Detail.Serial_No=10467
在您的选择中,您要对Searial_No And Sales_Detail.Serial_No=10467
进行硬编码,因此对于每一行,您将获得相同的值。
更改您喜欢的内容。
Select
Sales_Detail.Serial_No
,Sales_Detail.Tax_Percentage
,Card_Amount
,Cash_Amount
,ISNULL((Select Count(DISTINCT Tax_Percentage) From Sales_Detail SD
Left Join Sales_Master ON
Sales_Master.Serial_No=SD.Serial_No
Where Sales_Master.Invoice_Date = '14-Feb-2019'
And IsSaved='True'And IsCancelled = 'False'
And Card_Amount >0 Or Sales_Master.Cash_Amount>0
And SD.Serial_No=Sales_Detail.Serial_No
),1) As Count_Tax
From Sales_Detail
Inner Join Item_Master On Sales_Detail.Item_ID = Item_Master.Item_ID
Inner Join Item_Brand On Item_Master.Brand_ID = Item_Brand.Brand_ID
Inner Join Sales_Master On Sales_Detail.Serial_No=Sales_Master.Serial_No
left Join Customer C on C.Customer_ID =Sales_Master.Customer_ID
Inner Join Tax On Tax.Tax_Percentage=Sales_Detail.Tax_Percentage
Where Sales_Master.Invoice_Date = '14-Feb-2019' And IsSaved = 'True'
And IsCancelled = 'False'
order by Sales_Detail.SGST_Percentage ,Tax_Percentage
建议 :好的做法是始终为表使用别名,以便可以在多个位置轻松使用它而不会引起混淆。
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