SQL> select * from aa;
BB CC---------- ---------- 1 999999.99
SQL> col bb format '99.9';SQL> select * from aa;
BB CC----- ---------- 1.0 999999.99
SQL> col bb head '99.9';SQL> select * from aa;
99.9 CC----- ---------- 1.0 999999.99
SQL> col bb head '学号';SQL> select * from aa;
学号 CC----- ---------- 1.0 999999.99
SQL> col bb format '99';SQL> select * from aa;
学号 CC---- ---------- 1 999999.99
SQL> col bb head '学|号';SQL> select * from aa;
学 号 CC--- ---------- 1 999999.99
SQL> select count(bb),sum(cc) from aa;
COUNT(BB) SUM(CC)---------- ---------- 8192 8191999918
SQL> col sum(cc) format '9999999999.99';SQL> select count(bb),sum(cc) from aa;
COUNT(BB) SUM(CC)---------- -------------- 8192 8191999918.08
SQL> col sum(cc) format '9999999999.99' head '总分';SQL> col count(bb) format '999999' head '人数';SQL> select count(bb),sum(cc) from aa;
人数 总分------- -------------- 8192 8191999918.08