我打算使用这个SQL SELECT创建一个视图，但是它的解释显示它使用临时和使用filesort。我无法弄清楚我需要什么指数才能解决这个问题。大多数情况下，我想知道它为什么使用filesort而不是使用索引进行排序。
表bn_ms_gt_generaltransaction有700万条记录
表bn_pd_mp_masterprofile有几百条记录
表bn_pd_sc_scheme也有几百条记录
以下是create table语句：
CREATE TABLE `bn_ms_gt_generaltransaction` (
`GNTRDATE` date NOT NULL,
`GNTRNUMBER` decimal(10,0) NOT NULL,
`GNTRSUBNUMBER` decimal(5,0) NOT NULL,
`ORGACODE` varchar(20) NOT NULL,
`LOCACODE` varchar(20) NOT NULL,
`PRODCODE` varchar(20) DEFAULT NULL,
`SCHEMCODE` varchar(20) DEFAULT NULL,
`BKMSNUMBER` varchar(50) DEFAULT NULL,
`TRANCODE` varchar(20) NOT NULL,
`GNTRVALUEDAT` date NOT NULL,
`GNTRDRCR` varchar(20) NOT NULL,
`GLACCODE` varchar(50) NOT NULL,
`CURRCODE` varchar(20) NOT NULL,
`GNTRAMTFC` decimal(15,2) NOT NULL,
`GNTRSTATUS` varchar(2) DEFAULT NULL,
`TMODCODE` varchar(20) DEFAULT NULL,
PRIMARY KEY (`ORGACODE`,`LOCACODE`,`GNTRDATE`,`GNTRNUMBER`,`GNTRSUBNUMBER`),
KEY `CC10921796764` (`TMODCODE`),
KEY `SQL0407170412326` (`TRANCODE`),
KEY `SQL0407170412328` (`CURRCODE`),
KEY `SQL0407170412329` (`ORGACODE`,`GLACCODE`),
KEY `GNTRDRCR` (`GNTRDRCR`),
KEY `GLACCODE` (`GLACCODE`),
KEY `GT_ACC_NUM` (`PRODCODE`,`SCHEMCODE`,`BKMSNUMBER`),
KEY `GT_PK` (`GNTRDATE`,`GNTRNUMBER`,`GNTRSUBNUMBER`),
KEY `GT_EFFECTDATE` (`GNTREFFECTDAT`),
KEY `GT_GL_CODE` (`ORGACODE`,`LOCACODE`,`CURRCODE`,`GLACCODE`),
KEY `INDEX_GNTRDATE` (`GNTRDATE`),
KEY `INDEX_GNTRVALUEDAT` (`GNTRVALUEDAT`),
KEY `GT_VOUCHER` (`GNTRDATE`,`GNTRNUMBER`),
KEY `REPORT_INDEX_2` (`PRODCODE`,`SCHEMCODE`,`BKMSNUMBER`,`GNTRDATE`,`TRANCODE`,`GLACCODE`,`GNTRSTATUS`,`SGT_REVERSALTAG`,`GNTRAMTFC`),
KEY `INDEX_LRDL_GROUPBY` (`PRODCODE`,`SCHEMCODE`,`BKMSNUMBER`,`GNTRDATE`,`GNTRVALUEDAT`,`GNTREFFECTDAT`,`GNTRNUMBER`,`TRANCODE`,`TMODCODE`),
KEY `INDEX_LRDL_GROUPBY_LOOSE` (`PRODCODE`,`SCHEMCODE`,`BKMSNUMBER`,`GNTRDATE`,`GNTRVALUEDAT`,`GNTREFFECTDAT`,`GNTRNUMBER`,`TRANCODE`,`TMODCODE`,`GNTRAMTFC`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
CREATE TABLE `bn_pd_mp_masterprofile` (
`PRODCODE` varchar(20) NOT NULL,
`ORGACODE` varchar(20) DEFAULT NULL,
`GLACCODE` varchar(50) DEFAULT NULL,
PRIMARY KEY (`PRODCODE`),
KEY `SQL040126114206101` (`ORGACODE`,`GLACCODE`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
CREATE TABLE `bn_pd_sc_scheme` (
`PRODCODE` varchar(20) NOT NULL,
`SCHEMCODE` varchar(20) NOT NULL,
`ORGACODE` varchar(20) DEFAULT NULL,
`GLACCODE` varchar(50) DEFAULT NULL,
`CURRCODE` varchar(20) DEFAULT NULL,
`SCHEPURPOSE` varchar(100) DEFAULT NULL,
`CODE_PENALTY` varchar(50) DEFAULT NULL,
PRIMARY KEY (`PRODCODE`,`SCHEMCODE`),
KEY `SQL040126114217543` (`CURRCODE`),
KEY `CC1318422668625` (`PST_PSTYCODE`),
KEY `SQL040126114217560` (`ORGACODE`,`GLACCODE`),
KEY `CC1205848198000` (`ORGACODE`,`CODE_PENALTY`),
CONSTRAINT `CC1205848198000` FOREIGN KEY (`ORGACODE`, `CODE_PENALTY`) REFERENCES `pr_gl_ca_account` (`ORGACODE`, `GLACCODE`),
CONSTRAINT `SQL040126114217543` FOREIGN KEY (`CURRCODE`) REFERENCES `pr_gn_cr_currency` (`CURRCODE`),
CONSTRAINT `SQL040126114217560` FOREIGN KEY (`ORGACODE`, `GLACCODE`) REFERENCES `pr_gl_ca_account` (`ORGACODE`, `GLACCODE`),
CONSTRAINT `SQL040126114217562` FOREIGN KEY (`PRODCODE`) REFERENCES `bn_pd_mp_masterprofile` (`PRODCODE`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
以下是两个视图选择
SELECT
`a`.`PRODCODE` AS `PRODCODE`,
`a`.`SCHEMCODE` AS `SCHEMCODE`,
`a`.`BKMSNUMBER` AS `BKMSNUMBER`,
`a`.`GNTRDATE` AS `GNTRDATE`,
`a`.`GNTRVALUEDAT` AS `GNTRVALUEDAT`,
`a`.`GNTREFFECTDAT` AS `GNTREFFECTDAT`,
`a`.`GNTRNUMBER` AS `GNTRNUMBER`,
`a`.`TRANCODE` AS `TRANCODE`,
`a`.`TMODCODE` AS `TMODCODE`,
(CASE WHEN ((`a`.`TRANCODE` = '29') AND (`a`.`GNTRDRCR` = 'DR') AND (`a`.`GLACCODE` = `sc`.`GLACCODE`)) THEN COALESCE(`a`.`GNTRAMTFC`,0) END) AS `DISB_AMOUNT`,
(CASE WHEN ((`a`.`TRANCODE` = '29') AND (`a`.`GNTRDRCR` = 'CR') AND (`a`.`GLACCODE` = `sc`.`GLACCODE`)) THEN COALESCE(`a`.`GNTRAMTFC`,0) END) AS `DISB_AMOUNT_REV`,
(CASE WHEN ((`a`.`TRANCODE` IN ('30','32')) AND (`a`.`GNTRDRCR` = 'CR') AND (COALESCE(`a`.`GNTRSTATUS`,'P') 'C') AND (`a`.`GLACCODE` = `sc`.`GLACCODE`)) THEN COALESCE(`a`.`GNTRAMTFC`,0) END) AS `PRINCIPAL_AMOUNT`,
(CASE WHEN ((`a`.`TRANCODE` IN ('30','32')) AND (`a`.`GNTRDRCR` = 'CR') AND (COALESCE(`a`.`GNTRSTATUS`,'P') = 'C') AND (`a`.`GLACCODE` = `sc`.`GLACCODE`)) THEN COALESCE(`a`.`GNTRAMTFC`,0) END) AS `PRINCIPAL_AMOUNT_CANCEL`,
(CASE WHEN ((`a`.`TRANCODE` IN ('30','32')) AND (`a`.`GNTRDRCR` = 'DR') AND (`a`.`GLACCODE` = `sc`.`GLACCODE`)) THEN COALESCE(`a`.`GNTRAMTFC`,0) END) AS `PRINCIPAL_AMOUNT_REV`,
(CASE WHEN ((`a`.`TRANCODE` IN ('30','73','32')) AND (`a`.`GNTRDRCR` = 'CR') AND (`a`.`GLACCODE` = `sc`.`SCHEPURPOSE`)) THEN COALESCE(`a`.`GNTRAMTFC`,0) END) AS `MARKUP_AMOUNT`,
(CASE WHEN ((`a`.`TRANCODE` IN ('30','73','32')) AND (`a`.`GNTRDRCR` = 'DR') AND (`a`.`GLACCODE` = `sc`.`SCHEPURPOSE`)) THEN COALESCE(`a`.`GNTRAMTFC`,0) END) AS `MARKUP_AMOUNT_REV`,
(CASE WHEN ((`a`.`TRANCODE` IN ('30','55','32')) AND (`a`.`GNTRDRCR` = 'CR') AND (`a`.`GLACCODE` = `sc`.`CODE_PENALTY`)) THEN COALESCE(`a`.`GNTRAMTFC`,0) END) AS `OTHER_AMOUNT`,
(CASE WHEN ((`a`.`TRANCODE` IN ('30','55','32')) AND (`a`.`GNTRDRCR` = 'DR') AND (`a`.`GLACCODE` = `sc`.`CODE_PENALTY`)) THEN COALESCE(`a`.`GNTRAMTFC`,0) END) AS `OTHER_AMOUNT_REV`
FROM ((`bn_ms_gt_generaltransaction` `a`
JOIN `bn_pd_mp_masterprofile` `mp`
ON (((`mp`.`PRODCODE` = `a`.`PRODCODE`)
AND (`mp`.`PPC_PRCGCODE` = 'LOAN'))))
JOIN `bn_pd_sc_scheme` `sc`
ON (((`a`.`PRODCODE` = `sc`.`PRODCODE`)
AND (`a`.`SCHEMCODE` = `sc`.`SCHEMCODE`))))
WHERE ((`a`.`TRANCODE` IN('29','30','55','73','32'))
AND ((`a`.`GLACCODE` = `sc`.`GLACCODE`)
OR (`a`.`GLACCODE` = `sc`.`SCHEPURPOSE`)
OR (`a`.`GLACCODE` = `sc`.`CODE_PENALTY`))
AND ((COALESCE(`a`.`GNTRSTATUS`,'P') 'C')
OR ((COALESCE(`a`.`GNTRSTATUS`,'P') = 'C')
AND (`a`.`GNTRVALUEDAT` = `a`.`GNTRDATE`)
AND (`a`.`GNTRVALUEDAT` `a`.`GNTREFFECTDAT`))))
SELECT
`a`.`DMP_PRODCODE` AS `DMP_PRODCODE`,
`a`.`DCS_SCHEMCODE` AS `DCS_SCHEMCODE`,
`a`.`MBM_BKMSNUMBER` AS `MBM_BKMSNUMBER`,
`a`.`SGT_GNTRDATE` AS `SGT_GNTRDATE`,
`a`.`SGT_GNTRVALUEDAT` AS `SGT_GNTRVALUEDAT`,
`a`.`SGT_GNTREFFECTDAT` AS `SGT_GNTREFFECTDAT`,
`a`.`SGT_GNTRNUMBER` AS `SGT_GNTRNUMBER`,
`a`.`PTR_TRANCODE` AS `PTR_TRANCODE`,
`a`.`PTM_TMODCODE` AS `PTM_TMODCODE`,
SUM(COALESCE(`a`.`DISB_AMOUNT`,0)) AS `DISB_AMOUNT`,
SUM(COALESCE(`a`.`DISB_AMOUNT_REV`,0)) AS `DISB_AMOUNT_REV`,
(SUM(COALESCE(`a`.`DISB_AMOUNT`,0)) - SUM(COALESCE(`a`.`DISB_AMOUNT_REV`,0))) AS `TOTAL_DISB`,
SUM(COALESCE(`a`.`PRINCIPAL_AMOUNT`,0)) AS `PRINCIPAL_AMOUNT`,
SUM(COALESCE(`a`.`PRINCIPAL_AMOUNT_REV`,0)) AS `PRINCIPAL_AMOUNT_REV`,
SUM(COALESCE(`a`.`PRINCIPAL_AMOUNT_CANCEL`,0)) AS `PRINCIPAL_AMOUNT_CANCEL`,
(SUM(COALESCE(`a`.`PRINCIPAL_AMOUNT`,0)) - SUM(COALESCE(`a`.`PRINCIPAL_AMOUNT_REV`,0))) AS `TOTAL_PRINCIPAL`,
SUM(COALESCE(`a`.`MARKUP_AMOUNT`,0)) AS `MARKUP_AMOUNT`,
SUM(COALESCE(`a`.`MARKUP_AMOUNT_REV`,0)) AS `MARKUP_AMOUNT_REV`,
(SUM(COALESCE(`a`.`MARKUP_AMOUNT`,0)) - SUM(COALESCE(`a`.`MARKUP_AMOUNT_REV`,0))) AS `TOTAL_MARKUP`,
SUM(COALESCE(`a`.`OTHER_AMOUNT`,0)) AS `OTHER_AMOUNT`,
SUM(COALESCE(`a`.`OTHER_AMOUNT_REV`,0)) AS `OTHER_AMOUNT_REV`,
(SUM(COALESCE(`a`.`OTHER_AMOUNT`,0)) - SUM(COALESCE(`a`.`OTHER_AMOUNT_REV`,0))) AS `TOTAL_OTHER`
FROM `test_view` `a`
GROUP BY `a`.`DMP_PRODCODE`,`a`.`DCS_SCHEMCODE`,`a`.`MBM_BKMSNUMBER`,`a`.`SGT_GNTRDATE`,`a`.`SGT_GNTRVALUEDAT`,`a`.`SGT_GNTREFFECTDAT`,`a`.`SGT_GNTRNUMBER`,`a`.`PTR_TRANCODE`,`a`.`PTM_TMODCODE`$$
第二个视图使用第一个视图。
解释输出：
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY ALL 3564
2 DERIVED mp ref PRIMARY,SQL040126114206120 SQL040126114206120 63 const 3 Using where; Using index; Using temporary; Using filesort
2 DERIVED sc ref PRIMARY PRIMARY 62 mp.PRODCODE 2
2 DERIVED a ref SQL0407170412326,PCA_GLACCODE,GT_ACC_NUM,REPORT_INDEX_2,INDEX_LRDL_GROUPBY,INDEX_LRDL_GROUPBY_LOOSE INDEX_LRDL_GROUPBY 126 mp.PRODCODE,sc.SCHEMCODE 594 Using index condition; Using where
现在，顶部派生表显示使用临时;使用filesort 。
即使创建索引也无济于事。我尝试为松散索引创建分组依据，但不起作用。我错过了什么？
我已经探讨了它并发现了许多变通方法，但没有一个适合我的例子。有些人建议在加入之前在子查询中进行聚合，这是不可能的，因为MySQL不允许FROM子句中的子查询。
创建另一个视图不起作用，因为我需要在求和之前过滤记录
所以，有人可以帮我解决问题。