我有一些非常复杂的查询需要很长时间，我怀疑是因为它们的复杂连接。我在使用Sequalize ORM的Ubuntu上使用node。
选择展示位置：
SELECT
`Placement`.`id`,
`Placement`.`agencyPlacementName`,
`Placement`.`agencyPlacementId`,
`Placement`.`start`,
`Placement`.`end`,
`Placement`.`comments`,
`Placement`.`billingGroup`,
`Placement`.`mediaRate`,
`Placement`.`contractedQuantity`,
`Placement`.`excludeGallery`,
`Placement`.`pubSelect`,
`Placement`.`IoId`,
`Placement`.`IoId`,
`Placement`.`StrategyId`,
`Placement`.`SalesProductId`,
`Placement`.`MediaRateTypeId`,
`Placement`.`FrequencyCapId`,
`Placement`.`dfpLineItemId`,
`Placement`.`dfpLastModified`,
`Placement`.`dfpStatus`,
`Placement`.`isCarGurus`,
`Strategy`.`id` AS `Strategy.id`,
`Strategy`.`name` AS `Strategy.name`,
`Strategy`.`RequiredDetailTypeId` AS `Strategy.RequiredDetailTypeId`,
`SalesProduct`.`id` AS `SalesProduct.id`,
`SalesProduct`.`name` AS `SalesProduct.name`,
`SalesProduct`.`code` AS `SalesProduct.code`, `SalesProduct`.`canExcludeGallery` AS `SalesProduct.canExcludeGallery`,
`SalesProduct`.`canPubSelect` AS `SalesProduct.canPubSelect`,
`CreativeProducts`.`id` AS `CreativeProducts.id`,
`CreativeProducts`.`name` AS `CreativeProducts.name`,
`CreativeProducts.PlacementCreativeProducts`.`createdAt` AS `CreativeProducts.PlacementCreativeProducts.createdAt`,
`CreativeProducts.PlacementCreativeProducts`.`updatedAt` AS `CreativeProducts.PlacementCreativeProducts.updatedAt`,
`CreativeProducts.PlacementCreativeProducts`.`PlacementId` AS `CreativeProducts.PlacementCreativeProducts.PlacementId`,
`CreativeProducts.PlacementCreativeProducts`.`CreativeProductId` AS `CreativeProducts.PlacementCreativeProducts.CreativeProductId`,
`CustomCriteriaPresets`.`id` AS `CustomCriteriaPresets.id`,
`CustomCriteriaPresets`.`name` AS `CustomCriteriaPresets.name`,
`CustomCriteriaPresets.PlacementCustomTargeting`.`createdAt` AS `CustomCriteriaPresets.PlacementCustomTargeting.createdAt`,
`CustomCriteriaPresets.PlacementCustomTargeting`.`updatedAt` AS `CustomCriteriaPresets.PlacementCustomTargeting.updatedAt`,
`CustomCriteriaPresets.PlacementCustomTargeting`.`PlacementId` AS `CustomCriteriaPresets.PlacementCustomTargeting.PlacementId`,
`CustomCriteriaPresets.PlacementCustomTargeting`.`CustomCriteriaPresetId` AS `CustomCriteriaPresets.PlacementCustomTargeting.CustomCriteriaPresetId`,
`DataFees`.`id` AS `DataFees.id`,
`DataFees`.`amount` AS `DataFees.amount`,
`DataFees.DataFeeType`.`id` AS `DataFees.DataFeeType.id`,
`DataFees.DataFeeType`.`name` AS `DataFees.DataFeeType.name`,
`DataFees.DataFeeType`.`createdAt` AS `DataFees.DataFeeType.createdAt`,
`DataFees.DataFeeType`.`updatedAt` AS `DataFees.DataFeeType.updatedAt`,
`DataFees.DataFeeRateType`.`id` AS `DataFees.DataFeeRateType.id`,
`DataFees.DataFeeRateType`.`name` AS `DataFees.DataFeeRateType.name`,
`DataFees.DataFeeRateType`.`createdAt` AS `DataFees.DataFeeRateType.createdAt`,
`DataFees.DataFeeRateType`.`updatedAt` AS `DataFees.DataFeeRateType.updatedAt`,
`Geotargets`.`id` AS `Geotargets.id`,
`Geotargets`.`name` AS `Geotargets.name`,
`Geotargets`.`type` AS `Geotargets.type`,
`Geotargets`.`parentIds` AS `Geotargets.parentIds`,
`Geotargets.PlacementGeotargets`.`createdAt` AS `Geotargets.PlacementGeotargets.createdAt`,
`Geotargets.PlacementGeotargets`.`updatedAt` AS `Geotargets.PlacementGeotargets.updatedAt`,
`Geotargets.PlacementGeotargets`.`PlacementId` AS `Geotargets.PlacementGeotargets.PlacementId`,
`Geotargets.PlacementGeotargets`.`GeotargetId` AS `Geotargets.PlacementGeotargets.GeotargetId`, `Publishers`.`id` AS
`Publishers.id`, `Publishers`.`name` AS `Publishers.name`,
`Publishers.PlacementPublishers`.`createdAt` AS `Publishers.PlacementPublishers.createdAt`,
`Publishers.PlacementPublishers`.`updatedAt` AS `Publishers.PlacementPublishers.updatedAt`,
`Publishers.PlacementPublishers`.`PlacementId` AS `Publishers.PlacementPublishers.PlacementId`,
`Publishers.PlacementPublishers`.`PublisherId` AS `Publishers.PlacementPublishers.PublisherId`,
`DeviceTypes`.`id` AS `DeviceTypes.id`,
`DeviceTypes`.`name` AS `DeviceTypes.name`,
`DeviceTypes`.`code` AS `DeviceTypes.code`,
`DeviceTypes.PlacementDeviceTypes`.`createdAt` AS `DeviceTypes.PlacementDeviceTypes.createdAt`,
`DeviceTypes.PlacementDeviceTypes`.`updatedAt` AS `DeviceTypes.PlacementDeviceTypes.updatedAt`,
`DeviceTypes.PlacementDeviceTypes`.`PlacementId` AS `DeviceTypes.PlacementDeviceTypes.PlacementId`,
`DeviceTypes.PlacementDeviceTypes`.`DeviceTypeId` AS `DeviceTypes.PlacementDeviceTypes.DeviceTypeId`,
`DeviceTypes.CreativeProducts`.`id` AS `DeviceTypes.CreativeProducts.id`,
`DeviceTypes.CreativeProducts`.`name` AS `DeviceTypes.CreativeProducts.name`,
`DeviceTypes.CreativeProducts.DeviceTypeCreativeProducts`.`createdAt` AS `DeviceTypes.CreativeProducts.DeviceTypeCreativeProducts.createdAt`,
`DeviceTypes.CreativeProducts.DeviceTypeCreativeProducts`.`updatedAt` AS `DeviceTypes.CreativeProducts.DeviceTypeCreativeProducts.updatedAt`,
`DeviceTypes.CreativeProducts.DeviceTypeCreativeProducts`.`DeviceTypeId` AS `DeviceTypes.CreativeProducts.DeviceTypeCreativeProducts.DeviceTypeId`,
`DeviceTypes.CreativeProducts.DeviceTypeCreativeProducts`.`CreativeProductId` AS `DeviceTypes.CreativeProducts.DeviceTypeCreativeProducts.CreativeProductId`,
`FrequencyCap`.`numImps` AS `FrequencyCap.numImps`,
`FrequencyCap`.`numTimeUnits` AS `FrequencyCap.numTimeUnits`,
`FrequencyCap`.`id` AS `FrequencyCap.id`,
`FrequencyCap.FrequencyCapTimeUnit`.`id` AS `FrequencyCap.FrequencyCapTimeUnit.id`,
`FrequencyCap.FrequencyCapTimeUnit`.`name` AS `FrequencyCap.FrequencyCapTimeUnit.name`,
`FrequencyCap.FrequencyCapTimeUnit`.`createdAt` AS `FrequencyCap.FrequencyCapTimeUnit.createdAt`,
`FrequencyCap.FrequencyCapTimeUnit`.`updatedAt` AS `FrequencyCap.FrequencyCapTimeUnit.updatedAt`,
`MediaRateType`.`id` AS `MediaRateType.id`,
`MediaRateType`.`name` AS `MediaRateType.name`
FROM `Placements` AS `Placement`
LEFT OUTER JOIN `Strategies` AS `Strategy`
ON `Placement`.`StrategyId` = `Strategy`.`id`
LEFT OUTER JOIN `SalesProducts` AS `SalesProduct`
ON `Placement`.`SalesProductId` = `SalesProduct`.`id`
LEFT OUTER JOIN (
`PlacementCreativeProducts` AS `CreativeProducts.PlacementCreativeProducts`
INNER JOIN `CreativeProducts` AS `CreativeProducts`
ON `CreativeProducts`.`id` = `CreativeProducts.PlacementCreativeProducts`.`CreativeProductId`
) ON `Placement`.`id` = `CreativeProducts.PlacementCreativeProducts`.`PlacementId`
LEFT OUTER JOIN (
`PlacementCustomTargeting` AS `CustomCriteriaPresets.PlacementCustomTargeting`
INNER JOIN `CustomCriteriaPresets` AS `CustomCriteriaPresets`
ON `CustomCriteriaPresets`.`id` = `CustomCriteriaPresets.PlacementCustomTargeting`.`CustomCriteriaPresetId`
) ON `Placement`.`id` = `CustomCriteriaPresets.PlacementCustomTargeting`.`PlacementId`
LEFT OUTER JOIN `DataFees` AS `DataFees`
ON `Placement`.`id` = `DataFees`.`PlacementId`
LEFT OUTER JOIN `DataFeeTypes` AS `DataFees.DataFeeType`
ON `DataFees`.`DataFeeTypeId` = `DataFees.DataFeeType`.`id`
LEFT OUTER JOIN `DataFeeRateTypes` AS `DataFees.DataFeeRateType`
ON `DataFees`.`DataFeeRateTypeId` = `DataFees.DataFeeRateType`.`id`
LEFT OUTER JOIN (
`PlacementGeotargets` AS `Geotargets.PlacementGeotargets`
INNER JOIN `Geotargets` AS `Geotargets`
ON `Geotargets`.`id` = `Geotargets.PlacementGeotargets`.`GeotargetId`
) ON `Placement`.`id` = `Geotargets.PlacementGeotargets`.`PlacementId`
LEFT OUTER JOIN (
`PlacementPublishers` AS `Publishers.PlacementPublishers`
INNER JOIN `Publishers` AS `Publishers`
ON `Publishers`.`id` = `Publishers.PlacementPublishers`.`PublisherId`
) ON `Placement`.`id` = `Publishers.PlacementPublishers`.`PlacementId`
LEFT OUTER JOIN (
`PlacementDeviceTypes` AS `DeviceTypes.PlacementDeviceTypes`
INNER JOIN `DeviceTypes` AS `DeviceTypes`
ON `DeviceTypes`.`id` = `DeviceTypes.PlacementDeviceTypes`.`DeviceTypeId`
) ON `Placement`.`id` = `DeviceTypes.PlacementDeviceTypes`.`PlacementId`
LEFT OUTER JOIN (
`DeviceTypeCreativeProducts` AS `DeviceTypes.CreativeProducts.DeviceTypeCreativeProducts`
INNER JOIN `CreativeProducts` AS `DeviceTypes.CreativeProducts`
ON `DeviceTypes.CreativeProducts`.`id` = `DeviceTypes.CreativeProducts.DeviceTypeCreativeProducts`.`CreativeProductId`
) ON `DeviceTypes`.`id` = `DeviceTypes.CreativeProducts.DeviceTypeCreativeProducts`.`DeviceTypeId`
LEFT OUTER JOIN `FrequencyCaps` AS `FrequencyCap`
ON `Placement`.`FrequencyCapId` = `FrequencyCap`.`id`
LEFT OUTER JOIN `FrequencyCapTimeUnits` AS `FrequencyCap.FrequencyCapTimeUnit`
ON `FrequencyCap`.`FrequencyCapTimeUnitId` = `FrequencyCap.FrequencyCapTimeUnit`.`id`
LEFT OUTER JOIN `MediaRateTypes` AS `MediaRateType`
ON `Placement`.`MediaRateTypeId` = `MediaRateType`.`id`
WHERE `Placement`.`id` = 6502;
我已经完成了他们的解释，解释看起来很安静 全部是针对空的表，所以我不确定如何优化它们？ 这是一个问题，它只是拿起PRIMARY键而不是另一个Key吗？ 我应该创建复杂的索引吗？我该怎么做才能更快地完成这项工作？
展示位置选择解释
+----+-------------+---------------------------------------------------------+--------+--------------------------------+-------------+---------+-----------------------------------------------------------------------------------+------+-------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+---------------------------------------------------------+--------+--------------------------------+-------------+---------+-----------------------------------------------------------------------------------+------+-------+
| 1 | SIMPLE | Placement | const | PRIMARY | PRIMARY | 4 | const | 1 | NULL |
| 1 | SIMPLE | Strategy | const | PRIMARY | PRIMARY | 4 | const | 1 | NULL |
| 1 | SIMPLE | SalesProduct | const | PRIMARY | PRIMARY | 4 | const | 1 | NULL |
| 1 | SIMPLE | FrequencyCap | const | PRIMARY | NULL | NULL | NULL | 1 | NULL |
| 1 | SIMPLE | FrequencyCap.FrequencyCapTimeUnit | const | PRIMARY | NULL | NULL | NULL | 1 | NULL |
| 1 | SIMPLE | CreativeProducts.PlacementCreativeProducts | ref | PRIMARY,CreativeProductId | PRIMARY | 4 | const | 1 | NULL |
| 1 | SIMPLE | CreativeProducts | eq_ref | PRIMARY | PRIMARY | 4 | galileo.CreativeProducts.PlacementCreativeProducts.CreativeProductId | 1 | NULL |
| 1 | SIMPLE | CustomCriteriaPresets.PlacementCustomTargeting | ref | PRIMARY,CustomCriteriaPresetId | PRIMARY | 4 | const | 1 | NULL |
| 1 | SIMPLE | CustomCriteriaPresets | eq_ref | PRIMARY | PRIMARY | 4 | galileo.CustomCriteriaPresets.PlacementCustomTargeting.CustomCriteriaPresetId | 1 | NULL |
| 1 | SIMPLE | DataFees | ref | PlacementId | PlacementId | 4 | const | 1 | NULL |
| 1 | SIMPLE | DataFees.DataFeeType | eq_ref | PRIMARY | PRIMARY | 4 | galileo.DataFees.DataFeeTypeId | 1 | NULL |
| 1 | SIMPLE | DataFees.DataFeeRateType | eq_ref | PRIMARY | PRIMARY | 4 | galileo.DataFees.DataFeeRateTypeId | 1 | NULL |
| 1 | SIMPLE | Geotargets.PlacementGeotargets | ref | PRIMARY,GeotargetId | PRIMARY | 4 | const | 1 | NULL |
| 1 | SIMPLE | Geotargets | eq_ref | PRIMARY | PRIMARY | 4 | galileo.Geotargets.PlacementGeotargets.GeotargetId | 1 | NULL |
| 1 | SIMPLE | Publishers.PlacementPublishers | ref | PRIMARY,PublisherId | PRIMARY | 4 | const | 1 | NULL |
| 1 | SIMPLE | Publishers | eq_ref | PRIMARY | PRIMARY | 4 | galileo.Publishers.PlacementPublishers.PublisherId | 1 | NULL |
| 1 | SIMPLE | DeviceTypes.PlacementDeviceTypes | ref | PRIMARY,DeviceTypeId | PRIMARY | 4 | const | 1 | NULL |
| 1 | SIMPLE | DeviceTypes | eq_ref | PRIMARY | PRIMARY | 4 | galileo.DeviceTypes.PlacementDeviceTypes.DeviceTypeId | 1 | NULL |
| 1 | SIMPLE | DeviceTypes.CreativeProducts.DeviceTypeCreativeProducts | ref | PRIMARY,CreativeProductId | PRIMARY | 4 | galileo.DeviceTypes.id | 7 | NULL |
| 1 | SIMPLE | DeviceTypes.CreativeProducts | eq_ref | PRIMARY | PRIMARY | 4 | galileo.DeviceTypes.CreativeProducts.DeviceTypeCreativeProducts.CreativeProductId | 1 | NULL |
| 1 | SIMPLE | MediaRateType | const | PRIMARY | PRIMARY | 4 | const | 1 | NULL |
+----+-------------+---------------------------------------------------------+--------+--------------------------------+-------------+---------+-----------------------------------------------------------------------------------+------+-------+
21 rows in set (0.00 sec)