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mysql

select

distinct

where

and

order-by

insert

update

delete

top

between

alias

join

inner-join

left-join

right-join

full-join

union

select-into

create-database

create-table

not-null

unique

primary-key

foreign-key

check

default

alter-table

auto-increment

null

avg

count

first

last

max

min

sum

group-by

having

ucase

lcase

mid

len

round

now

format

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mysql NOT NULL约束

mysql NOT NULL约束用法详解

mysql NOT NULL约束

中文翻译最近更新: 2019-01-04 15:28:59

not

英 [nɒt] 美 [nɑ:t]

adv.不;[用以表示否定、否认、拒绝、禁止等]不是;几乎不;未必，没有[用于否定后面的词或短语]

null

英 [nʌl] 美 [nʌl]

adj.<术>零值的;等于零的;（协议）无法律效力;失效的