优化具有联接的MySQL查询

Question

如何优化下面的查询。由于连接太多

    SELECT `providers`.`provider_id`, `providers`.`providerFirstName`, `providers`.`providerLastName`, `providers`.`email`, `providers`.`phoneNumber`, `providers`.`address`, `providers`.`agencyName`, `providers`.`practiceCounty`, `providers`.`city`, `providers`.`state`, `providers`.`zip`, `providers`.`mondayHours`, `providers`.`tuesdayHours`, `providers`.`wednesdayHours`, `providers`.`thursdayHours`, `providers`.`fridayHours`, `providers`.`saturdayHours`, `providers`.`sundayHours`, `providers`.`additionalInfo`, `providers`.`website`, `providers`.`newClientsAcceptance`, `providers`.`updatedBy`, `providers`.`otherCategories`, `providers`.`otherInsurances`, `providers`.`otherTelehealthServices`, `providers`.`createdAt`, `providers`.`updatedAt`, `ProviderInsurances`.`provider_insurance_id` AS `ProviderInsurances.provider_insurance_id`, `ProviderInsurances`.`insurance_id` AS `ProviderInsurances.insurance_id`, `ProviderInsurances->Insurance`.`insurance_id` AS `ProviderInsurances.Insurance.insurance_id`, `ProviderInsurances->Insurance`.`insurance_name` AS `ProviderInsurances.Insurance.insurance_name`, `ProviderClients`.`provider_client_id` AS `ProviderClients.provider_client_id`, `ProviderClients`.`client_id` AS `ProviderClients.client_id`, `ProviderClients->Client`.`client_id` AS `ProviderClients.Client.client_id`, `ProviderClients->Client`.`client_name` AS `ProviderClients.Client.client_name`, `ProviderCounties`.`provider_county_id` AS `ProviderCounties.provider_county_id`, `ProviderCounties`.`county_id` AS `ProviderCounties.county_id`, `ProviderCounties->County`.`county_id` AS `ProviderCounties.County.county_id`, `ProviderCounties->County`.`county_name` AS `ProviderCounties.County.county_name`, `ProviderSpecialities`.`provider_speciality_id` AS `ProviderSpecialities.provider_speciality_id`, `ProviderSpecialities`.`speciality_id` AS `ProviderSpecialities.speciality_id`, `ProviderSpecialities->Speciality`.`speciality_id` AS `ProviderSpecialities.Speciality.speciality_id`, `ProviderSpecialities->Speciality`.`speciality_name` AS `ProviderSpecialities.Speciality.speciality_name`, `ProviderCategories`.`provider_category_id` AS `ProviderCategories.provider_category_id`, `ProviderCategories`.`category_id` AS `ProviderCategories.category_id`, `ProviderCategories->Category`.`category_id` AS `ProviderCategories.Category.category_id`, `ProviderCategories->Category`.`category_name` AS `ProviderCategories.Category.category_name`, `Telehealths`.`telehealth_id` AS `Telehealths.telehealth_id`, `Telehealths`.`telehealth_name` AS `Telehealths.telehealth_name` 
FROM `providers` AS `providers` 
LEFT OUTER JOIN `provider_insurances` AS `ProviderInsurances` ON `providers`.`provider_id` = `ProviderInsurances`.`provider_id` 
LEFT OUTER JOIN `insurance` AS `ProviderInsurances->Insurance` ON `ProviderInsurances`.`insurance_id` = `ProviderInsurances->Insurance`.`insurance_id` 
LEFT OUTER JOIN `provider_clients` AS `ProviderClients` ON `providers`.`provider_id` = `ProviderClients`.`provider_id` 
LEFT OUTER JOIN `clients` AS `ProviderClients->Client` ON `ProviderClients`.`client_id` = `ProviderClients->Client`.`client_id` 
LEFT OUTER JOIN `provider_counties` AS `ProviderCounties` ON `providers`.`provider_id` = `ProviderCounties`.`provider_id` 
LEFT OUTER JOIN `counties` AS `ProviderCounties->County` ON `ProviderCounties`.`county_id` = `ProviderCounties->County`.`county_id` 
LEFT OUTER JOIN `provider_specialities` AS `ProviderSpecialities` ON `providers`.`provider_id` = `ProviderSpecialities`.`provider_id` 
LEFT OUTER JOIN `specialities` AS `ProviderSpecialities->Speciality` ON `ProviderSpecialities`.`speciality_id` = `ProviderSpecialities->Speciality`.`speciality_id` 
LEFT OUTER JOIN `provider_categories` AS `ProviderCategories` ON `providers`.`provider_id` = `ProviderCategories`.`provider_id` 
LEFT OUTER JOIN `categories` AS `ProviderCategories->Category` ON `ProviderCategories`.`category_id` = `ProviderCategories->Category`.`category_id` 
LEFT OUTER JOIN `telehealth` AS `Telehealths` ON `providers`.`provider_id` = `Telehealths`.`provider_id` 
WHERE `providers`.`updatedAt` 
BETWEEN '2019-08-06 18:30:00' AND '2019-08-08 00:00:00';

减少执行时间的最佳实践是什么。请帮忙。

我在下面添加了“ EXPLAIN SELECT”输出

Answer 1

确保连接所涉及的列上具有正确的索引，例如：

对于

table  provider_insurances columns  (provider_id, insurance_id)
table  insurance columns (insurance_id)
table  provider_clients columns (provider_id)
...
....
table  providers columns (updatedAt, provider_id )

Answer 2

您可以使用sequelize ORM处理查询联接。链接=> [https://sequelize.org/master/manual/querying.html]