asked on
SQL Query Past Due Query
I am trying to create a aging report using SQL.
I'm trying to grab the balance for all customers who had a invoice due in the previous month. So if it's March, then I want to show all the balances for invoices that were due in February.
This is what I came up with, but I keep getting 0 for the Customers that I know have balances in the month of February.
SELECT arar_cust_n, arar_due_date,
case
when arar_due_date = Month(DATEADD(mm, -1, GETDATE()))
then arar_balance
else 0
End as thirtydaypassed
from arar
Please help.
I'm trying to grab the balance for all customers who had a invoice due in the previous month. So if it's March, then I want to show all the balances for invoices that were due in February.
This is what I came up with, but I keep getting 0 for the Customers that I know have balances in the month of February.
SELECT arar_cust_n, arar_due_date,
case
when arar_due_date = Month(DATEADD(mm, -1, GETDATE()))
then arar_balance
else 0
End as thirtydaypassed
from arar
Please help.
Microsoft SQL ServerMicrosoft SQL Server 2008SQL
Last Comment
Scott Pletcher
ASKER CERTIFIED SOLUTION
THIS SOLUTION ONLY AVAILABLE TO MEMBERS.
View this solution by signing up for a free trial.
Members can start a 7-Day free trial and enjoy unlimited access to the platform.
ASKER
Your query worked.
Would you explain it to me?
Would you explain it to me?
Sure. This part:
DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()), 0)
is a very efficient and common technique for getting the first day, at midnight, of the current month, for example, if run today it returns:
2015-03-01 00:00:00.000
Now, since you want the previous month only, I subtract 1 month from that to get the starting day of the previous month to be the lowest date:
>= DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()) - 1, 0)
To make sure we don't count anything past last month, we use < (less than, not <=) of the first day of the current month:
< DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()), 0)
This technique means the code keeps working correctly even if the data type of the column being compared changes. This code works accurately for any date/datetime data type, while the <= methods do NOT.
Similarly, if I wanted to get all data for 2014, I should code it this way:
column >= '20140101' AND column < '20150101'
Or, more generically:
column >= DATEADD(YEAR, DATEDIFF(YEAR, 0, GETDATE()) - 1, 0) AND
column < DATEADD(YEAR, DATEDIFF(YEAR, 0, GETDATE()), 0)
This approach is very flexible and very efficient.
DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()), 0)
is a very efficient and common technique for getting the first day, at midnight, of the current month, for example, if run today it returns:
2015-03-01 00:00:00.000
Now, since you want the previous month only, I subtract 1 month from that to get the starting day of the previous month to be the lowest date:
>= DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()) - 1, 0)
To make sure we don't count anything past last month, we use < (less than, not <=) of the first day of the current month:
< DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()), 0)
This technique means the code keeps working correctly even if the data type of the column being compared changes. This code works accurately for any date/datetime data type, while the <= methods do NOT.
Similarly, if I wanted to get all data for 2014, I should code it this way:
column >= '20140101' AND column < '20150101'
Or, more generically:
column >= DATEADD(YEAR, DATEDIFF(YEAR, 0, GETDATE()) - 1, 0) AND
column < DATEADD(YEAR, DATEDIFF(YEAR, 0, GETDATE()), 0)
This approach is very flexible and very efficient.
Open in new window
Saurabh...