sql allow nullとは 意味・読み方・使い方

There is no official permission.

the license is invalid

to open anything to public inspection―throw open anything to the public―（掲示に書けば）―open to the public

to admit a student on probation

permission to be presented unofficially at a royal audience

to be paroled from prison―to get a ticket of leave

to admit a person

to admit one

be cleared for takeoff

the leftmost non-zero digit

the condition of allowing free movement of people in and out of a certain place

takeoff clearance＝clearance for takeoff

to be admitted on probation

gain [obtain] admission

to be admitted into a society―admitted to membership―admitted as a member―（秘密会なら）―initiated into a secret society

to admit one to membership

to admit a man （into membership）

a nonexistent goal

net tonnage―net register

unutterable consonant clusters

an arrow left unused

unanalyzed data

an unlicensed taxi

an uncountable noun

an uncountable noun

a scoreless inning

an empty can

nonrepetitive DNA sequence

an unstable order

an untraceable source