Problem:

List the monthly sales for the year 2013. For each month, include the sales from 6 months ago.
Click here for details on LAG.
 
 12 Records
Month Monthly Sales 6 Months ago
1 66692.80 NULL
2 41207.20 NULL
3 39979.90 NULL
4 55699.39 NULL
5 56823.70 NULL
6 39088.00 NULL
7 55464.93 66692.80
8 49981.69 41207.20
9 59733.02 39979.90
10 70328.50 55699.39
11 45913.36 56823.70
12 77476.26 39088.00
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