小巧。快速。可靠。
三选二。

column-constraint

CONSTRAINT name PRIMARY KEY DESC conflict-clause AUTOINCREMENT ASC NOT NULL conflict-clause UNIQUE conflict-clause CHECK ( expr ) DEFAULT ( expr ) literal-value signed-number COLLATE collation-name foreign-key-clause GENERATED ALWAYS AS ( expr ) VIRTUAL STORED

用在：   column-def

参考：   conflict-clause   expr   foreign-key-clause   literal-value   signed-number

另请参阅：   gencol.html   lang_altertable.html   lang_createtable.html