创建/更改mysql表的列时如何创建布尔列并分配值1？

Question

I'm trying something like this =>

alter table tablename modify columnname "boolean" default 1 NOT NULL;

Which is the correct format to create boolean column ?

Answer 1

ALTER TABLE tablename CHANGE columnname columnname BOOLEAN DEFAULT '1' NOT NULL

这就是你追求的吗？

Answer 2

alter table tablename modify columnname boolean default true NOT NULL;

Don't put quotes around boolean .

I tested this on a column that was int and it worked.

Answer 3

instead of boolean use TINYINT(1). This is preferred on InnoDB database engine