CREATE TABLE
CREATE TABLE `critical_url` (
`id` INTEGER AUTO_INCREMENT NOT NULL PRIMARY KEY,
`logical_name` VARCHAR(100) NOT NULL,
`subtype` VARCHAR(20) NOT NULL
);
CHANGE COLUMN NAME
ALTER TABLE `critical_urltest`
CHANGE `gender` `sex` VARCHAR(10) NOT NULL;
ADD COLUMN
ALTER TABLE `critical_urltest`
ADD COLUMN `last_name` VARCHAR(20) DEFAULT "zhou" NOT NULL;
OR
ALTER TABLE `critical_urltest`
ADD COLUMN `last_name` VARCHAR(20) NOT NULL;