Excellent job posting ddl and sample data. I am a little uncertain what you want for output. In your original post this is what you had for PRJ_ID 1
The output i want is
Date, Prj_ID, Amount
Jan12, 1, 1000
Feb12, 1, 1500
Mar12, 1, 1500
Apr12, 1 , 1800
May12, 1, 1800
Jun12 , 1 , 1800
July12, 1 , 1200
Au12 , 1 , 1200
Sep12, 1 , 1200
Is the data supposed to split by month? What defines the start and end months? In your example here you go to September but the data ends in July.
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