create profile changepassword limit password_life_time10password_grace_time2password_reuse_time10;#查看配置文件select*fromdba_profileswhereprofile='CHANGEPASSWORD';#查看用户配置文件selectusername,profilefromdba_userswhereusername='XIAOMING2';#删除配置文件 cascade 把相关的东西都删除掉drop profile[ProfileName...
1select*from_orderwhereshop_id=1andorder_statusin(1,2,3)orderbycreated_atdesclimit10 in查询在MySQL底层是通过n*m的方式去搜索,类似union,但是效率比union高。in查询在进行cost代价计算时(代价 = 元组数 * IO平均值),是通过将in包含的数值,一条条去查询获取元组数的,因此这个计算过程会比较的慢,所以MySQ...
select * from users where a=1 or b=2db.users.find( { $or : [ { a : 1 } , { b : 2 } ] } )条件查询 select * from users limit 1db.users.findOne()条件查询 select * from users where name like "%Joe%"db.users.find({name:/Joe/})模糊查询 ...
select*from_orderwhereshop_id=1andorder_statusin(1,2,3)orderbycreated_atdesclimit10 in查询在MySQL底层是通过n*m的方式去搜索,类似union,但是效率比union高。in查询在进行cost代价计算时(代价 = 元组数 * IO平均值),是通过将in包含的数值,一条条去查询获取元组数的,因此这个计算过程会比较的慢,所以MySQL...
select*from_orderwhereshop_id=1andorder_statusin(1,2,3)orderbycreated_atdesclimit10 in查询在MySQL底层是通过n*m的方式去搜索,类似union,但是效率比union高。in查询在进行cost代价计算时(代价 = 元组数 * IO平均值),是通过将in包含的数值,一条条去查询获取元组数的,因此这个计算过程会比较的慢,所以MySQL...
select*from_orderwhereshop_id=1andorder_statusin(1,2,3)orderbycreated_atdesclimit10 in查询在MySQL底层是通过n*m的方式去搜索,类似union,但是效率比union高。in查询在进行cost代价计算时(代价 = 元组数 * IO平均值),是通过将in包含的数值,一条条去查询获取元组数的,因此这个计算过程会比较的慢,所以MySQL...
1selectt1.*from_t t1, (selectidfrom_twherea =1and b =2orderbyc desc limit10000,10) t2wheret1.id = t2.id; 案例4:in + order by 索引 1KEY`idx_shopid_status_created`(`shop_id`,`order_status`,`created_at`) SQL语句 1select*from_orderwhereshop_id=1andorder_statusin(1,2,3)...
select*from_orderwhereshop_id=1andorder_statusin(1,2,3)orderbycreated_atdesclimit10 in查询在MySQL底层是通过n*m的方式去搜索,类似union,但是效率比union高。in查询在进行cost代价计算时(代价 = 元组数 * IO平均值),是通过将in包含的数值,一条条去查询获取元组数的,因此这个计算过程会比较的慢,所以MySQL...
Each of the selected high-market share food manufacturers made statements about the importance of nutrition and health (Table 1), which have the potential to limit use of inappropriate health statements and claims and marketing techniques on unhealthy foods. Fresh apples and bananas acted as bench...