MySQL：避免视图中GROUPBY子句导致的临时/Filesort

我计划使用这个SQLSELECT创建一个视图，但是对它的解释显示它使用的是临时的和文件排序。我不知道我需要什么索引来解决这个问题。主要是，我想知道为什么它使用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_方案也有几百条记录

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 下面是两个视图

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`)))) 第二个视图使用第一个视图

explain的输出：

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，顶部的派生表显示使用临时；使用文件排序。 即使创建索引也无济于事。我尝试在GroupBy上为松散索引创建索引，但没有成功。我错过什么了吗？ 我对此进行了探索，发现了许多变通方法，但没有一个适合我的例子。有人建议在联接之前在子查询中进行聚合，这是不可能的，因为MySQL不允许在FROM子句中使用子查询。 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。 那么，有人能帮我解决这个问题吗

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