thinkphp 查询数据库数据根据两个字段group，且统计条数用法

$result=M('sale_lead')    ->field('lead_source,created_by,count(sale_lead_id ) as count_num')    ->group('lead_source,created_by')    ->where($where)    ->select();
结果：
array(14) {  [0] => array(3) {    ["lead_source"] => string(1) "1"    ["created_by"] => string(2) "42"    ["count_num"] => string(1) "1"  }  [1] => array(3) {    ["lead_source"] => string(1) "3"    ["created_by"] => string(2) "43"    ["count_num"] => string(1) "1"  }  [2] => array(3) {    ["lead_source"] => string(1) "4"    ["created_by"] => string(2) "29"    ["count_num"] => string(1) "2"  }  [3] => array(3) {    ["lead_source"] => string(1) "5"    ["created_by"] => string(2) "29"    ["count_num"] => string(1) "1"  }  [4] => array(3) {    ["lead_source"] => string(1) "5"    ["created_by"] => string(2) "42"    ["count_num"] => string(1) "1"  }  [5] => array(3) {    ["lead_source"] => string(1) "6"    ["created_by"] => string(2) "29"    ["count_num"] => string(1) "2"  }  [6] => array(3) {    ["lead_source"] => string(1) "7"    ["created_by"] => string(2) "42"    ["count_num"] => string(1) "1"  }  [7] => array(3) {    ["lead_source"] => string(1) "7"    ["created_by"] => string(2) "43"    ["count_num"] => string(1) "2"  }  [8] => array(3) {    ["lead_source"] => string(1) "8"    ["created_by"] => string(2) "42"    ["count_num"] => string(1) "5"  }  [9] => array(3) {    ["lead_source"] => string(1) "8"    ["created_by"] => string(2) "43"    ["count_num"] => string(1) "2"  }  [10] => array(3) {    ["lead_source"] => string(2) "13"    ["created_by"] => string(2) "43"    ["count_num"] => string(1) "1"  }  [11] => array(3) {    ["lead_source"] => string(2) "43"    ["created_by"] => string(2) "43"    ["count_num"] => string(1) "2"  }  [12] => array(3) {    ["lead_source"] => string(2) "44"    ["created_by"] => string(2) "43"    ["count_num"] => string(1) "1"  }  [13] => array(3) {    ["lead_source"] => string(2) "45"    ["created_by"] => string(2) "43"    ["count_num"] => string(1) "1"  }}