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SQL> select employee_id,first_name,salary from employees fetch first 5 rows only;

EMPLOYEE_ID FIRST_NAME               SALARY
----------- -------------------- ----------
		100 Steven                    24000
		101 Neena                     17000
		102 Lex                       17000
		103 Alexander                  9000
		104 Bruce                      6000

SQL> show sqlformat
SQL 格式: Default
SQL> set sqlformat csv

SQL> show sqlformatSQL 格式: csv

SQL> select employee_id,first_name,salary from employees fetch first 5 rows only;
"EMPLOYEE_ID","FIRST_NAME","SALARY"
100,"Steven",24000
101,"Neena",17000
102,"Lex",17000
103,"Alexander",9000
104,"Bruce",6000

SQL> set head off
SQL> select * from employees fetch first 5 rows only;
100,"Steven","King","SKING","515.123.4567",17-JUN-03,"AD_PRES",24000,,,90
101,"Neena","Kochhar","NKOCHHAR","515.123.4568",21-SEP-05,"AD_VP",17000,,100,90
102,"Lex","De Haan","LDEHAAN","515.123.4569",13-JAN-01,"AD_VP",17000,,100,90
103,"Alexander","Hunold","AHUNOLD","590.423.4567",03-JAN-06,"IT_PROG",9000,,102,60
104,"Bruce","Ernst","BERNST","590.423.4568",21-MAY-07,"IT_PROG",6000,,103,60

SQL>