oracle group by语句实例测试

CREATE TABLE test(a VARCHAR2( 20),b VARCHAR2 (20),c NUMBER,d VARCHAR2 (20))

INSERT INTO test VALUES( 'a1','b1' ,1, 't');
INSERT INTO test VALUES( 'a3','b3' ,3, 't');
INSERT INTO test VALUES( 'a4','b4' ,4, 't');
INSERT INTO test VALUES( 'a2','b2' ,2, 't');
INSERT INTO test VALUES( 'xx','xx' ,5, 'x');

INSERT INTO test VALUES( 'a1','b1' ,1, 't');
INSERT INTO test VALUES( 'a3','b3' ,3, 't');
INSERT INTO test VALUES( 'a4','b4' ,4, 't');
INSERT INTO test VALUES( 'a2','b2' ,2, 't');
INSERT INTO test VALUES( 'xx','xx' ,5, 'x');
COMMIT;