122. An inert gas system installed on a tanker is designed to ___
122. An inert gas system installed on a tanker is designed to ___
Which of the<br/>following words means “lacking the ability or strength to<br/>move”? () A: vile B: wry C: inert D: close-cropped
Which of the<br/>following words means “lacking the ability or strength to<br/>move”? () A: vile B: wry C: inert D: close-cropped
A fire starting by spontaneous combustion can be expected in which condition?（）. A: Paints，varnish，or other liquid flammables are stowed in a dry stores locker B: Inert cargoes such as pig iron are loaded in a wet condition C: Oily rags are stowed in a metal pail D: Clean mattresses are stored in contact with an electric light bul
A fire starting by spontaneous combustion can be expected in which condition?（）. A: Paints，varnish，or other liquid flammables are stowed in a dry stores locker B: Inert cargoes such as pig iron are loaded in a wet condition C: Oily rags are stowed in a metal pail D: Clean mattresses are stored in contact with an electric light bul
一个用户表中有一个积分字段，假如数据库中有100多万个用户，若要在每年第一天凌晨将积分清零，你将考虑什么，你将想什么办法解决? alter table drop column score; alter table add colunm score int; 可能会很快，但是需要试验，试验不能拿真实的环境来操刀，并且要注意，这样的操作时无法回滚的，在我的印象中，只有inert update delete等DML语句才能回滚，对于create table,drop table ,alter table等DDL语句是不能回滚
一个用户表中有一个积分字段，假如数据库中有100多万个用户，若要在每年第一天凌晨将积分清零，你将考虑什么，你将想什么办法解决? alter table drop column score; alter table add colunm score int; 可能会很快，但是需要试验，试验不能拿真实的环境来操刀，并且要注意，这样的操作时无法回滚的，在我的印象中，只有inert update delete等DML语句才能回滚，对于create table,drop table ,alter table等DDL语句是不能回滚