不行也。。。i use: ALTER TABLE t CHANGE a a numeric(20);
got error: All parts of a PRIMARY KEY must be NOT NULL; If you need NULL in a key, use UNIQUE instead..
why? is it because the field 'a' is a primary key?
how come this error appear,...
after u do the altering????
do u have any null value which is ur primary key ?
do u have any null value which is ur primary key ?
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