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CREATE TABLE patients ( FULL_NAME VARCHAR(100) NOT NULL, SEX CHAR(1), BIRTH_DATE DATE, OMS_NUM BIGINT ); ALTER TABLE patients ADD COLUMN card_num INT; CREATE TABLE med_area ( AREA_NUM VARCHAR(100), AREA_ADDRESS TEXT ); ALTER TABLE med_area CHANGE area_num area_num TINYINT NOT NULL, CHANGE area_address area_address VARCHAR(1000) NOT NULL; ALTER TABLE patients CHANGE oms_num oms_num BIGINT UNIQUE; ALTER TABLE patients ADD COLUMN area_num TINYINT; ALTER TABLE patients ADD FOREIGN KEY (area_num) REFERENCES med_area(area_num);

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