=Vehicle.BaseVehicleIDSTRAIGHT_JOINSTRAIGHT_JOIN VehicleToEngineConfig ON Vehicle.VehicleID=VehicleToEngineConfig.VehicleID
STRAIGHT_JOINSTRAIGHT_JOIN BodyNumDoors ON BodyStyleConfig.BodyNu
S.test_file_result_id,S.syndrome, TDR.start_date AS start_date, TL.job_id AS job_id FROM Syndrome S STRAIGHT_JOINTest_File_Result TF ON TF.id = S.test_file_result_id STRAIGHT_JOIN Test_Directory_Result TDR ON TDR.id=TF.test_directory_result_id STRAIGHT_JOIN Test_Run TR ON
COUNT(*) FROM x AS t1 INNER JOIN x AS t2 USING (id);和我想简单地将内部连接替换为直接连接:SELECT COUNT(*) FROM x AS t1 STRAIGHT_JOIN如果我将查询更改为简单的SELECT COUNT(*) FROM x AS t1 STRAIGHT_JOIN x AS t2 ON t1.id=t2.id
MySQL不允许直接加入使用吗?
当我以内联方式提供值时,为什么下面的查询速度较慢但速度较快? select u.* from user uwhere g.account_id = 1-- takes ~30ms select id from user_group where account_id = 1;where group_id in (99,1
我正在编写一个创建SQL查询的PHP脚本。该脚本和数据库用于Joomla CMS,特别是查询SOBIPro组件的表(以使用在该组件中输入的数据)。但是,由于SOBI Pro表的处理方式,字段的每个实例都是表中自己的行,这意味着对于我要拉回的每个字段,都要包含一个单独的表实例。这似乎不是很有效,实际上在这个搜索中它超时了。 SELECT DISTINCT o.id AS entryid, o.parent AS parentID, name.baseData AS title,business.baseData AS business_
SELECT DISTINCT cp.id_product, p.id_manufacturer, product_shop.condition, p.weight FROM ps_category c STRAIGHT_JOINps_category_product cp ON (c.id_category = cp.id_category AND c.nleft >= 35 AND c.nright <= 52 AND c.active = 1) STRAIGHT_JOINps_product_shop product_shop ON (pr