【单选题】SQL中下列涉及空值的操作不正确的是( )
【单选题】There have been demonstrations in the streets in the wake of the recent bomb attack.
A.
v. [to wake (up) to sth.] to experience something as you are waking up
B.
n. [in the wake of an event] if something, especially something bad, happens in the wake of an event, it happens after wards and usually as a result of it
C.
n. a track behind or after someone or something
【单选题】根据会计法律制度的规定,对于尚不构成犯罪的伪造,变造会计凭证行为,需要承担的行政罚款,下列说法正确的是
【多选题】相较于封闭式询问,开放式询问的特点包括()。
【单选题】SQL中,下列涉及空值的操作,不正确的是
【单选题】在SQL中,下列涉及空值的操作不正确的语句是( )。
【单选题】SQL中,下列涉及空值的操作,不正确的是