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CREATE TABLE Writters (
writerid int NOT NULL UNIQUE,
firstname varchar(20) NOT NULL,
lastname varchar(20) NOT NULL,
age int NOT NULL
PRIMARY KEY(writerid)


)

CREATE TABLE reviews (
    reviewid int NOT NULL UNIQUE,
    writerid int NOT NULL UNIQUE,
    rate int  NOT NULL,
    opinion varchar (255) DEFAULT 'Good',
    CHECK (rate>=0),
    PRIMARY KEY (reviewid),
    FOREIGN KEY (writerid) REFERENCES Writters(writerid)

);