SQL> Select *from Dba_Roles 2.2 显示表空间限额的信息 SQL> select Tablespace_Name,Username,Bytes,max_bytes SQL> from dba_ts_quotas;2.4 显示开工文件和相关资源限制设置的信息 SQL> Select profile,resource_name,limit SQL> from Dba_profiles;2.5 显示当前用户拥有的所有的表 SQL> Se...
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...
spark.sql.decimalOperations.allowPrecisionLoss = true, fs.s3a.retry.limit = '20', fs.s3a.secret.key = '', mergetree.insert_without_local_storage = false, mergetree.merge_after_insert = true, fs.s3a.endpoint = 'localhost:9000', fs.s3a.access.key = '' 2024-08-20 14:59:52.769 <Fa...
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...
A distance limit grade threshold of 2g/t Au was applied and composites with a grade higher than this were ignored at distances greater than 21m from the sample. Cube used Isatis software to carry out the analysis of the spatial continuity of the data through variography. The ...
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 users where name like "Joe%"db.users.find({name:/^Joe/})模糊查询 select count(1) from usersDb.users.count()获取表记录数 ...
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)...