sql server - SQL Selecting multiple sums? -


मान लें कि मेरे पास एक टेबल है: 

  SELECT SUM (quantity) AS items_sold_since_date, product_ID बिक्री से WHERE order_date & gt; = '01 / 01/09 'GROUP BY product_ID

यह एक विशेष तिथि के बाद से बेची गई मात्रा के साथ उत्पादों की एक सूची देता है। क्या इस राशि को न केवल चुनने का एक तरीका है, लेकिन फिर भी जहां हालत के बिना राशि है? मैं सभी उत्पाद के साथ किसी उत्पाद के लिए किसी विशेष तिथि (बिक्री की तिथि नहीं) के बाद से बिक्री देखना चाहूंगा।

< पूर्व> SELECT SUM (मामले में जब आदेश_डेटा> = '01 / 01/09 'तो मात्रा ELSE 0 END) के रूप में आइटम_सॉल्ड_सेंस_डेट, SUM (मात्रा) AS items_sold_total, product_ID से उत्पाद समूह_ उत्पाद_आईडी

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