How to further filter GROUP BY record in mysql?

问题

Please check the images i want complete ROW of query-id "43"(and with another nic_id max query_id row) but it give me only max query_id, I tried different queries for-example:

SELECT `Query_id`, `nic_id`, `date`, `subject`, `followup_no`, MAX(Query_id) as queryid FROM `sales_queries` GROUP BY `nic_id` HAVING MAX(`Query_id`)

SELECT `Query_id`, `nic_id`, `date`, `subject`, `followup_no`, MAX(Query_id) as queryid FROM `sales_queries` WHERE  GROUP BY `nic_id` HAVING MAX(`Query_id`)

SELECT  `Query_id`, `nic_id`, `date`, `subject`, `followup_no`, MAX(Query_id) as mxqueryid    FROM `sales_queries`WHERE `Query_id` = (SELECT MAX(`Query_id`) FROM `sales_queries`) GROUP BY `nic_id`

when customer visit again followup increase(+1) with his same nic_id with different subject.

i want complete 43 row with subject "Registration4", date etc

NOT THIS, it should be Registration4 date:2015-09-11

回答1:

Similarly to the answer to this question, you can use a subquery and join in order to fetch the results you are after. Something similar to the following should work:

SELECT `Query_id`, `nic_id`, `date`, `subject`, `followup_no`
FROM `sales_queries` AS sq
INNER JOIN (
    SELECT MAX(`Query_id`) AS mId
    FROM `sales_queries`
    GROUP BY `nic_id`
) AS subsq ON subsq.mId = sq.Query_id

回答2:

i am using below three queries in three different pages. I want IF MAX(Query_id) is not available specific range of dates then it ignore it.

/////////////   QUERY 1  \\\\\\\\\\\\\\\\\\\\\

$sql="SELECT * FROM sales_queries AS sq INNER JOIN ( SELECT MAX(Query_id) AS mId FROM sales_queries WHERE follow_up > '".$s_date."' GROUP BY nic_id ) AS subsq ON subsq.mId = sq.Query_id";

///////////// QUERY 2 \\\\\\\\\\\

$sql="SELECT * FROM sales_queries AS sq INNER JOIN ( SELECT MAX(Query_id) AS mId FROM sales_queries WHERE follow_up BETWEEN '".$s_date."' AND '".$e_date."' GROUP BY nic_id ) AS subsq ON subsq.mId = sq.Query_id";

///////////// QUERY 3 \\\\\\\\\\\

来源：https://stackoverflow.com/questions/32517231/how-to-further-filter-group-by-record-in-mysql

标签

php

mysql

group-by