列的拼接

使用||作为连接运算符

SQL> select ename||CHR(32)||CHR(32)||'WORK AS A '||job as msg from emp;



MSG

-------------------------------

SMITH  WORK AS A CLERK

ALLEN  WORK AS A SALESMAN

WARD  WORK AS A SALESMAN

JONES  WORK AS A MANAGER

MARTIN	WORK AS A SALESMAN

BLAKE  WORK AS A MANAGER

CLARK  WORK AS A MANAGER

SCOTT  WORK AS A ANALYST

KING  WORK AS A PRESIDENT

TURNER	WORK AS A SALESMAN

ADAMS  WORK AS A CLERK



MSG

-------------------------------

JAMES  WORK AS A CLERK

FORD  WORK AS A ANALYST

MILLER	WORK AS A CLERK



14 rows selected.

CHR(32)代表空格