谁能帮我调整这个查询.....
explain extended
SELECT DISTINCT a.msisdn FROM `std_msc_opr_wise` a
LEFT OUTER JOIN
(SELECT msisdn
FROM as_treat_pre_usage_30days
GROUP BY msisdn
HAVING SUM(std_total_og_mou)>0) b ON a.msisdn=b.msisdn
WHERE
b.msisdn IS NULL
AND a.call_dt BETWEEN '2013-03-27' AND '2013-04-28';
+----+-------------+---------------------------+-------+---------------+---------+---------+------+----------+----------+-----------------------------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
+----+-------------+---------------------------+-------+---------------+---------+---------+------+----------+----------+-----------------------------------+
| 1 | PRIMARY | a | ALL | ix_cd | NULL | NULL | NULL | 73985537 | 50.00 | Using where; Using temporary |
| 1 | PRIMARY | <derived2> | ALL | NULL | NULL | NULL | NULL | 1121664 | 100.00 | Using where; Not exists; Distinct |
| 2 | DERIVED | as_treat_pre_usage_30days | index | NULL | PRIMARY | 14 | NULL | 3033621 | 100.00 | |
+----+-------------+---------------------------+-------+---------------+---------+---------+------+----------+----------+-----------------------------------+
3 rows in set, 1 warning (1.70 sec)
________________________________________________________________________
explain extended
SELECT DISTINCT a.msisdn FROM `std_msc_opr_wise` a FORCE INDEX(ix_cd) LEFT OUTER JOIN
(SELECT msisdn FROM as_treat_pre_usage_30days GROUP BY msisdn HAVING SUM(std_total_og_mou)>0 )b
ON a.msisdn=b.msisdn
WHERE b.msisdn IS NULL AND a.call_dt BETWEEN '2013-03-27' AND '2013-04-28';
+----+-------------+---------------------------+-------+---------------+---------+---------+------+----------+----------+-----------------------------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
+----+-------------+---------------------------+-------+---------------+---------+---------+------+----------+----------+-----------------------------------+
| 1 | PRIMARY | a | range | ix_cd | ix_cd | 4 | NULL | 36992756 | 100.00 | Using where; Using temporary |
| 1 | PRIMARY | <derived2> | ALL | NULL | NULL | NULL | NULL | 1121664 | 100.00 | Using where; Not exists; Distinct |
| 2 | DERIVED | as_treat_pre_usage_30days | index | NULL | PRIMARY | 14 | NULL | 3033621 | 100.00 | |
+----+-------------+---------------------------+-------+---------------+---------+---------+------+----------+----------+-----------------------------------+
____________________________________________________
TABLE SCHEMA
____________________________________________________
CREATE TABLE `as_treat_pre_usage_30days` (
`msisdn` varchar(12) NOT NULL COMMENT 'Subscriber number',
`local_a2a_og_mou` bigint(20) DEFAULT NULL COMMENT 'Local A2A OG MOU of the subs',
`local_a2o_og_mou` bigint(20) DEFAULT NULL COMMENT 'Local A2O OG MOU of the subs',
`std_total_og_mou` bigint(20) DEFAULT NULL COMMENT 'STD OG MOU of the subs',
`total_og_mou` bigint(20) DEFAULT NULL COMMENT 'Total OG MOU of the subs',
PRIMARY KEY (`msisdn`),
KEY `ix_std` (`std_total_og_mou`)
) ENGINE=InnoDB
____________________________________________________
CREATE TABLE `std_msc_opr_wise` (
`msisdn` varchar(12) DEFAULT NULL COMMENT 'Mobile Number of the Subscriber',
`call_dt` date DEFAULT NULL,
`destination_type` varchar(5) DEFAULT NULL COMMENT 'Destination Type - A2A or A2O',
`duration` int(6) DEFAULT NULL COMMENT 'Call Duration in Seconds',
KEY `ix_ms` (`msisdn`),
KEY `ix_cd` (`call_dt`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
/*!50100 PARTITION BY RANGE (to_days(call_dt))
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