CREATE TABLE performance(
   theatre_performance NUMBER(6, 0) ,
   season VARCHAR2(9) CONSTRAINT perf_season_NN NOT NULL,
   producer VARCHAR2(30) CONSTRAINT perf_producer_NN NOT NULL,
   description VARCHAR2(255),
   price_ticket NUMBER(5, 2),
    CONSTRAINT perf_theatre_perf_PK PRIMARY KEY(theatre_performance)
);