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CREATE TABLE STARS (SID NUMBER, SNAME VARCHAR2(50), SBDATE DATE, SBPLACE VARCHAR2(50),PRIMARY KEY (SID));
CREATE TABLE DIRECTORS (DID NUMBER, DNAME VARCHAR2(50), DBDATE DATE, DBPLACE VARCHAR2(50), PRIMARY KEY(DID));
CREATE TABLE STUDIOS (STID NUMBER, STNAME VARCHAR2(50), STADDRESS VARCHAR2(250), PRIMARY KEY (STID));
CREATE TABLE GENRE (GID NUMBER, GNAME VARCHAR(50), PRIMARY KEY (GID));
CREATE TABLE MOVIE_STARS(MID NUMBER, SID NUMBER, SALARY NUMBER,PRIMARY KEY (MID,SID),FOREIGN KEY(MID) REFERENCES MOVIE, FOREIGN KEY(SID) REFERENCES STARS);
CREATE TABLE MOVIE_DIRECTORS(MID NUMBER,DID NUMBER, BUDGET NUMBER,PRIMARY KEY (MID,DID),FOREIGN KEY(MID) REFERENCES MOVIE, FOREIGN KEY(DID) REFERENCES DIRECTORS(DID));
CREATE TABLE MOVIE_GENRE(MID NUMBER, GID NUMBER,PRIMARY KEY (MID,GID),FOREIGN KEY(MID) REFERENCES MOVIE, FOREIGN KEY(GID) REFERENCES GENRE);
ALTER TABLE STARS
ADD AGE NUMBER;
ALTER TABLE STARS
MODIFY AGE VARCHAR2(250);
ALTER TABLE STARS
DROP COLUMN AGE;
ALTER TABLE STARS
RENAME COLUMN SNAME TO STARNAME;
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