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
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