mysql - Please help on a complicated sql query -


MySQL 5.0.45

तालिका A में निम्नलिखित फ़ील्ड (कॉलम) हैं: 1. transcation_id
2. ग्राहक_नाम
3. item_id
4. .....

अब मुझे पता है कि प्रत्येक ग्राहक ने # लेनदेन के द्वारा कितने लेनदेन किए हैं। इसका परिणाम होना चाहिए:

टॉम 7 लेनदेन
जैक 5 लेनदेन
माइक 2 लेनदेन

अगर कोई ग्राहक का कोई लेन-देन उसका नाम नहीं होना चाहिए

कैसे के बारे में: 

  चुनें client_name, count (*) को टेबलए ग्रुप से लेनदेन के रूप में client_name द्वारा गिनती (*) डीईएससी

द्वारा क्रमबद्ध करें लेनदेन के बिना क्लाइंट मान लें कि तालिका में (क्योंकि तालिका में लेनदेन_आईडी कॉलम है) वे परिणाम में नहीं होंगे।


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