如何查看前3个月和未来3个月的数据

Question

I am working with telecom data. So basically I have mobile numbers and I need to have a flag (Yes/ No) that has following conditions.

Flag 'Yes' if,

1. Invoice month must be at-least for 3 months
2. Total_Minutes_Used=0
3. Total_Data_Usage_MB=0
4. Case if Total_Minutes_Used=0 OR Total_Data_Usage_MB=0 for next 3 months (to check for +- 3 months) else 'No'

Sample data

Mobile Number  Invoice_Month Total_Minutes_Used Total_Data_Usage_MB
------------- -------------- ------------------ -------------------
9112222210          01-2019     0                 0
9112222210          02-2019     0                 0
9112222210          03-2019     0                 45
9112222210          04-2019     0                 0
9112222211          01-2019     0                 0
9112222211          02-2019     0                 0
9112222211          03-2019     0                 0
9112222211          04-2019     0                 0
9112222212          01-2019     0                 0
9112222212          02-2019     0                 0
9112222212          03-2019     0                 0
9112222212          04-2019     0                 50

Expected Output

Mobile Number  Invoice_Month Total_Minutes_Used Total_Data_Usage_MB       Flag
------------- -------------- ------------------ -------------------       ----
9112222210          01-2019     0                 0      N
9112222210          02-2019     0                 0      N
9112222210          03-2019     0                 45     N
9112222210          04-2019     0                 0      N
9112222211          01-2019     0                 0      N
9112222211          02-2019     0                 0      N
9112222211          03-2019     0                 0      Y
9112222211          04-2019     0                 0      Y
9112222212          01-2019     0                 0      N
9112222212          02-2019     0                 0      N
9112222212          03-2019     0                 0      N
9112222212          04-2019     0                 50     N

I tried it with LEAD and LAG but it is not working as expected.

Answer 1

You could try this

select *, 
case when Invoice_Month <= DATEADD(mm, -3, GETDATE()) AND
          Total_Minutes_Used=0 AND
          Total_Data_Usage_MB=0 AND
          Total_Minutes_Used=0 OR Total_Data_Usage_MB=0 THEN "YES"
          ELSE "NO"
          END AS FLAG 
FROM TABLE_NAME;