DROP TABLE IF EXISTS t1, t2, t3; CREATE TABLE t1 (EMPNUM CHAR(3) NOT NULL, EMPNAME CHAR(20), GRADE DECIMAL(4), CITY CHAR(15)) ENGINE = ; CREATE TABLE t2 (PNUM CHAR(3) NOT NULL, PNAME CHAR(20), PTYPE CHAR(6), BUDGET DECIMAL(9), CITY CHAR(15)) ENGINE = ; CREATE TABLE t3 (EMPNUM CHAR(3) NOT NULL, PNUM CHAR(3) NOT NULL, HOURS DECIMAL(5) ) ENGINE = ; INSERT INTO t1 VALUES ('E1','Alice',12,'Deale'); INSERT INTO t1 VALUES ('E2','Betty',10,'Vienna'); INSERT INTO t1 VALUES ('E3','Carmen',13,'Vienna'); INSERT INTO t1 VALUES ('E4','Don',12,'Deale'); INSERT INTO t1 VALUES ('E5','Ed',13,'Akron'); INSERT INTO t2 VALUES ('P1','MXSS','Design',10000,'Deale'); INSERT INTO t2 VALUES ('P2','CALM','Code',30000,'Vienna'); INSERT INTO t2 VALUES ('P3','SDP','Test',30000,'Tampa'); INSERT INTO t2 VALUES ('P4','SDP','Design',20000,'Deale'); INSERT INTO t2 VALUES ('P5','IRM','Test',10000,'Vienna'); INSERT INTO t2 VALUES ('P6','PAYR','Design',50000,'Deale'); INSERT INTO t3 VALUES ('E1','P1',40); INSERT INTO t3 VALUES ('E1','P2',20); INSERT INTO t3 VALUES ('E1','P3',80); INSERT INTO t3 VALUES ('E1','P4',20); INSERT INTO t3 VALUES ('E1','P5',12); INSERT INTO t3 VALUES ('E1','P6',12); INSERT INTO t3 VALUES ('E2','P1',40); INSERT INTO t3 VALUES ('E2','P2',80); INSERT INTO t3 VALUES ('E3','P2',20); INSERT INTO t3 VALUES ('E4','P2',20); INSERT INTO t3 VALUES ('E4','P4',40); INSERT INTO t3 VALUES ('E4','P5',80); COMMIT WORK; -- PASS:0099 If 3 rows selected with EMPNAMEs:'Alice', 'Betty', 'Don'? CREATE UNIQUE INDEX t1_IDX ON t1(EMPNUM); SELECT EMPNAME FROM t1 WHERE EMPNUM IN (SELECT EMPNUM FROM t3 WHERE PNUM IN (SELECT PNUM FROM t2 WHERE PTYPE = 'Design')); EMPNAME Alice Betty Don DROP INDEX t1_IDX ON t1; CREATE INDEX t1_IDX ON t1(EMPNUM); SELECT EMPNAME FROM t1 WHERE EMPNUM IN (SELECT EMPNUM FROM t3 WHERE PNUM IN (SELECT PNUM FROM t2 WHERE PTYPE = 'Design')); EMPNAME Alice Betty Don DROP INDEX t1_IDX ON t1; SELECT EMPNAME FROM t1 WHERE EMPNUM IN (SELECT EMPNUM FROM t3 WHERE PNUM IN (SELECT PNUM FROM t2 WHERE PTYPE = 'Design')); EMPNAME Alice Betty Don DROP TABLE t1, t2, t3;