sql - Firebird howto count all record in table and sort max to min -

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मेरा डीबी संरचना 

  Table_1 ग्राहक |

परिणाम प्राप्त करने के लिए और इसे इसे फायरबर्ड में सॉर्ट कैसे करें। 

  टेबल 1 ग्राहक | आवृत्ति cust_c 4 cust_a 3 cust_e 3 cust_d 2 cust_b 1

नोट .. अब मैं इस आदेश का उपयोग यह बहुत धीमी है। और वास्तविक डेटा 9800 रिकॉर्ड है 

  पहले 10 को छोड़कर 0 अलग ग्राहक चुनें, (table_1 pdr से select count (*), जहां pdr.customer = prd.customer) table_1 prd  < ग्राहक द्वारा ग्राहक आदेश द्वारा 2 वर्णों के द्वारा तालिकाई समूह से freq के रूप में गणना करें (*) ग्राहक, ग्राहक का चयन करें;


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