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sql server data mining : Extracting by oldest date
How do I build query to extract the following columns from
two tables? I need the following as a result: Order_History.Order_No, Order_History.Date_Changed, Employee.Emp_Name (Join on Emp_ID) Order_History Table: Order_No, Date_Changed, Emp_ID sample data .... 1001, 1/1/2000, aab 1001, 2/1/2000, aab 1001, 2/15/2000, ddd 1001, 3/10/2000, dbc Employee Table: Emp_ID, Emp_Name The problem is this: I want the Distinct order_no with the oldest date including the Emp_Name, so from the above tables the following will be the correct result: 1001, 1/1/2000, Jack Smith (aab) I cannot include the Emp_ID with Select Distinct or use Min (Date_Changed) to get the oldest date, because any of these options can only return two columns (as far as I know) If I use Distinct and include Emp_ID I get the following (I only want the first row with the oldest date): 1001, 1/1/2000, aab 1001, 2/1/2000, aab Any help will be appreciated Thanks
Adam,
Thank you for the reply The sub query you suggest cannot be based on the user_id though. This is the process flow behind it: 1)We want to generate a list of orders (all orders) showing date created and employee name - unfortunately the user info is kept in the Order_History 2)As per the sample, there are multiple rows for each order, including the last_date_changed and User_id 1001, 1/1/2000, aab 1001, 2/1/2000, aab 1001, 2/15/2000, ddd 1001, 3/10/2000, dbc The following query will give me the correct result, but does not include the user information - i need the user information included: SELECT Order_No, min(Changed_Date) as MyDate FROM Order_History GROUP BY Order_No So how do I get the above result + user name? Hope this gives you more info Thanks Marius [quoted text, click to view] >-----Original Message-----
>Marius, > >I don't quite understand how you need the JOIN done, but you can start with >something like: > >SELECT Order_History.Order_No, > Order_History.Date_Changed, > Employee.Emp_Name >FROM Order_History >JOIN Employee ON Order_History.Emp_Id = Employee.Emp_Id >WHERE Order_History.Date_Changed = > (SELECT MIN(Date_Changed) > FROM Order_History OH1 > WHERE OH1.Emp_Id = Employee.Emp_Id) > > >"IT-MAN" <anonymous@discussions.microsoft.com> wrote in message >news:179401c4a9a1$bae4c480$a501280a@phx.gbl... >> How do I build query to extract the following columns from >> two tables? >> >> I need the following as a result: >> Order_History.Order_No, >> Order_History.Date_Changed, >> Employee.Emp_Name >> (Join on Emp_ID) >> >> Order_History Table: >> Order_No, Date_Changed, Emp_ID >> sample data .... >> 1001, 1/1/2000, aab >> 1001, 2/1/2000, aab >> 1001, 2/15/2000, ddd >> 1001, 3/10/2000, dbc >> >> Employee Table: >> Emp_ID, Emp_Name >> >> The problem is this: I want the Distinct order_no with the >> oldest date including the Emp_Name, so from the above >> tables the following will be the correct result: >> 1001, 1/1/2000, Jack Smith (aab) >> >> I cannot include the Emp_ID with Select Distinct or use Min >> (Date_Changed) to get the oldest date, because any of >> these options can only return two columns (as far as I >> know) If I use Distinct and include Emp_ID I get the >> following (I only want the first row with the oldest date): >> 1001, 1/1/2000, aab >> 1001, 2/1/2000, aab >> >> >> Any help will be appreciated >> Thanks >> Marius > > >.
Marius,
I don't quite understand how you need the JOIN done, but you can start with something like: SELECT Order_History.Order_No, Order_History.Date_Changed, Employee.Emp_Name FROM Order_History JOIN Employee ON Order_History.Emp_Id = Employee.Emp_Id WHERE Order_History.Date_Changed = (SELECT MIN(Date_Changed) FROM Order_History OH1 WHERE OH1.Emp_Id = Employee.Emp_Id) [quoted text, click to view] "IT-MAN" <anonymous@discussions.microsoft.com> wrote in message news:179401c4a9a1$bae4c480$a501280a@phx.gbl... > How do I build query to extract the following columns from > two tables? > > I need the following as a result: > Order_History.Order_No, > Order_History.Date_Changed, > Employee.Emp_Name > (Join on Emp_ID) > > Order_History Table: > Order_No, Date_Changed, Emp_ID > sample data .... > 1001, 1/1/2000, aab > 1001, 2/1/2000, aab > 1001, 2/15/2000, ddd > 1001, 3/10/2000, dbc > > Employee Table: > Emp_ID, Emp_Name > > The problem is this: I want the Distinct order_no with the > oldest date including the Emp_Name, so from the above > tables the following will be the correct result: > 1001, 1/1/2000, Jack Smith (aab) > > I cannot include the Emp_ID with Select Distinct or use Min > (Date_Changed) to get the oldest date, because any of > these options can only return two columns (as far as I > know) If I use Distinct and include Emp_ID I get the > following (I only want the first row with the oldest date): > 1001, 1/1/2000, aab > 1001, 2/1/2000, aab > > > Any help will be appreciated > Thanks > Marius
Does this work:
SELECT Order_History.Order_No, Order_History.Date_Changed, Employee.Emp_Name FROM Order_History JOIN Employee ON Order_History.Emp_Id = Employee.Emp_Id WHERE Order_History.Date_Changed = (SELECT MIN(Date_Changed) FROM Order_History OH1 WHERE OH1.Order_No = Order_History.Order_No) [quoted text, click to view] <anonymous@discussions.microsoft.com> wrote in message news:3c8401c4a9cc$f724e7b0$a601280a@phx.gbl... > Adam, > Thank you for the reply > The sub query you suggest cannot be based on the user_id > though. > > This is the process flow behind it: > 1)We want to generate a list of orders (all orders) > showing date created and employee name - unfortunately the > user info is kept in the Order_History > > 2)As per the sample, there are multiple rows for each > order, including the last_date_changed and User_id > 1001, 1/1/2000, aab > 1001, 2/1/2000, aab > 1001, 2/15/2000, ddd > 1001, 3/10/2000, dbc > > The following query will give me the correct result, but > does not include the user information - i need the user > information included: > > SELECT Order_No, min(Changed_Date) as MyDate > FROM Order_History > GROUP BY Order_No > > So how do I get the above result + user name? > > Hope this gives you more info > Thanks > Marius > > > >-----Original Message----- > >Marius, > > > >I don't quite understand how you need the JOIN done, but > you can start with > >something like: > > > >SELECT Order_History.Order_No, > > Order_History.Date_Changed, > > Employee.Emp_Name > >FROM Order_History > >JOIN Employee ON Order_History.Emp_Id = Employee.Emp_Id > >WHERE Order_History.Date_Changed = > > (SELECT MIN(Date_Changed) > > FROM Order_History OH1 > > WHERE OH1.Emp_Id = Employee.Emp_Id) > > > > > >"IT-MAN" <anonymous@discussions.microsoft.com> wrote in > message > >news:179401c4a9a1$bae4c480$a501280a@phx.gbl... > >> How do I build query to extract the following columns > from > >> two tables? > >> > >> I need the following as a result: > >> Order_History.Order_No, > >> Order_History.Date_Changed, > >> Employee.Emp_Name > >> (Join on Emp_ID) > >> > >> Order_History Table: > >> Order_No, Date_Changed, Emp_ID > >> sample data .... > >> 1001, 1/1/2000, aab > >> 1001, 2/1/2000, aab > >> 1001, 2/15/2000, ddd > >> 1001, 3/10/2000, dbc > >> > >> Employee Table: > >> Emp_ID, Emp_Name > >> > >> The problem is this: I want the Distinct order_no with > the > >> oldest date including the Emp_Name, so from the above > >> tables the following will be the correct result: > >> 1001, 1/1/2000, Jack Smith (aab) > >> > >> I cannot include the Emp_ID with Select Distinct or use > Min > >> (Date_Changed) to get the oldest date, because any of > >> these options can only return two columns (as far as I > >> know) If I use Distinct and include Emp_ID I get the > >> following (I only want the first row with the oldest > date): > >> 1001, 1/1/2000, aab > >> 1001, 2/1/2000, aab > >> > >> > >> Any help will be appreciated > >> Thanks > >> Marius > > > > > >. > >
It worked!
You are the man - The champ - The Guru Thanks Marius [quoted text, click to view] >-----Original Message-----
>Does this work: > > >SELECT Order_History.Order_No, > Order_History.Date_Changed, > Employee.Emp_Name >FROM Order_History >JOIN Employee ON Order_History.Emp_Id = Employee.Emp_Id >WHERE Order_History.Date_Changed = > (SELECT MIN(Date_Changed) > FROM Order_History OH1 > WHERE OH1.Order_No = Order_History.Order_No) > > ><anonymous@discussions.microsoft.com> wrote in message >news:3c8401c4a9cc$f724e7b0$a601280a@phx.gbl... >> Adam, >> Thank you for the reply >> The sub query you suggest cannot be based on the user_id >> though. >> >> This is the process flow behind it: >> 1)We want to generate a list of orders (all orders) >> showing date created and employee name - unfortunately the >> user info is kept in the Order_History >> >> 2)As per the sample, there are multiple rows for each >> order, including the last_date_changed and User_id >> 1001, 1/1/2000, aab >> 1001, 2/1/2000, aab >> 1001, 2/15/2000, ddd >> 1001, 3/10/2000, dbc >> >> The following query will give me the correct result, but >> does not include the user information - i need the user >> information included: >> >> SELECT Order_No, min(Changed_Date) as MyDate >> FROM Order_History >> GROUP BY Order_No >> >> So how do I get the above result + user name? >> >> Hope this gives you more info >> Thanks >> Marius >> >> >> >-----Original Message----- >> >Marius, >> > >> >I don't quite understand how you need the JOIN done, but >> you can start with >> >something like: >> > >> >SELECT Order_History.Order_No, >> > Order_History.Date_Changed, >> > Employee.Emp_Name >> >FROM Order_History >> >JOIN Employee ON Order_History.Emp_Id = Employee.Emp_Id >> >WHERE Order_History.Date_Changed = >> > (SELECT MIN(Date_Changed) >> > FROM Order_History OH1 >> > WHERE OH1.Emp_Id = Employee.Emp_Id) >> > >> > >> >"IT-MAN" <anonymous@discussions.microsoft.com> wrote in >> message >> >news:179401c4a9a1$bae4c480$a501280a@phx.gbl... >> >> How do I build query to extract the following columns >> from >> >> two tables? >> >> >> >> I need the following as a result: >> >> Order_History.Order_No, >> >> Order_History.Date_Changed, >> >> Employee.Emp_Name >> >> (Join on Emp_ID) >> >> >> >> Order_History Table: >> >> Order_No, Date_Changed, Emp_ID >> >> sample data .... >> >> 1001, 1/1/2000, aab >> >> 1001, 2/1/2000, aab >> >> 1001, 2/15/2000, ddd >> >> 1001, 3/10/2000, dbc >> >> >> >> Employee Table: >> >> Emp_ID, Emp_Name >> >> >> >> The problem is this: I want the Distinct order_no with >> the >> >> oldest date including the Emp_Name, so from the above >> >> tables the following will be the correct result: >> >> 1001, 1/1/2000, Jack Smith (aab) >> >> >> >> I cannot include the Emp_ID with Select Distinct or use >> Min >> >> (Date_Changed) to get the oldest date, because any of >> >> these options can only return two columns (as far as I >> >> know) If I use Distinct and include Emp_ID I get the >> >> following (I only want the first row with the oldest >> date): >> >> 1001, 1/1/2000, aab >> >> 1001, 2/1/2000, aab >> >> >> >> >> >> Any help will be appreciated >> >> Thanks >> >> Marius >> > >> > >> >. >> > > > >.
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