独孤岛

摘要： create table test_1 ( x number(10), y number(10) ); insert into test_1 values (1,110); insert into test_1 values (2,120); insert into test_1 values (2,80); insert into test_1 values (3,150); insert into test_1 values (3,30); insert into test_1 values (3,60); commit; select * from test_1; X Y----... 阅读全文