SQL查询以查找最后日期

Question

We enter our production data in the database next day of production, I am using the following query to get the yesterday data.

Query works fine until after weekend, it shows nothing on Monday because there is no production on weekend.

Is there anyway I can change the query to show me the last day of production.

SELECT Date, ProductCode
FROM Production
WHERE (ProductCode In ('35032','40112-I','41212-I','50112','824-5'))                   
AND (Date=Dateadd(dd,-1,Convert(char(8),Current_timestamp,112)))

Answer 1

A simple solution with a CASE statement to check to see if it's a Monday, and if so, subtract 3 days rather than 1.

SELECT  Date, ProductCode
FROM    Production
WHERE   (ProductCode In ('35032','40112-I','41212-I','50112','824-5'))                   
AND     (Date=Dateadd(Day, Case When DatePart(WeekDay, Current_Timestamp) = 2 Then -3 Else -1 End, Convert(Date, Current_Timestamp)))

Another (more precise) solution would be to pull the most recent Date in the table that isn't today's Date :

SELECT  Date, ProductCode
FROM    Production
WHERE   (ProductCode In ('35032','40112-I','41212-I','50112','824-5'))                   
AND     (Date= (Select Max(Date) From Production Where Date <> Convert(Date, Current_Timestamp)))