oracle loap函数用法

先看测试情况：

SCOTT@orcl#select level,lpad(' ',2*level-1)||ename as ename from emp2  start with ename='KING'3  connect by prior empno=mgr4   order by level;LEVEL ENAME
---------- --------------------------------------------------1  KING2    JONES2    BLAKE2    CLARK3      TURNER3      ALLEN3      WARD3      MARTIN3      SCOTT4        ADAMS已选择10行。SCOTT@orcl#select length('abc'),lpad('abc',4,'$'),lpad('abc',5,'^'),lpad('abc',5,'gf'),lpad('abc',6,'gf') from dual;LENGTH('ABC') LPAD('AB LPAD('ABC' LPAD('ABC' LPAD('ABC',6
------------- -------- ---------- ---------- ------------3 $abc     ^^abc      gfabc      gfgabcSCOTT@orcl#select level,lpad(level,4*level-1,'#')||ename as ename from emp2  start with ename='KING'3  connect by prior empno=mgr 4  order by level;LEVEL ENAME
---------- --------------------------------------------------1 ##1KING2 ######2JONES2 ######2BLAKE2 ######2CLARK3 ##########3TURNER3 ##########3ALLEN3 ##########3WARD3 ##########3MARTIN3 ##########3SCOTT4 ##############4ADAMS已选择10行。SCOTT@orcl#select level,lpad(level,4*level)||ename as ename from emp2  start with ename=     3  'JONES'4  CONNECT BY prior empno=mgr5  order by level;LEVEL ENAME
---------- --------------------------------------------------1    1JONES2        2SCOTT3            3ADAMSSCOTT@orcl#select level,lpad(level,4*level-1)||ename as ename from emp2  start with ename= 'JONES'3  CONNECT BY prior empno=mgr4  order by level;LEVEL ENAME
---------- --------------------------------------------------1   1JONES2       2SCOTT3           3ADAMSSCOTT@orcl#select level,lpad(level,4*level-1,'^')||ename2  as ename from emp3  start with ename='JONES'4  connect by prior empno=mgr5  order by level;LEVEL ENAME
---------- --------------------------------------------------1 ^^1JONES2 ^^^^^^2SCOTT3 ^^^^^^^^^^3ADAMSSCOTT@orcl#

SCOTT@orcl#r1  select level,lpad('',4*level-1)||ename as ename from emp2  start with ename=UPPER('king')3  connect by prior empno=mgr4* order by levelLEVEL ENAME
---------- --------------------------------------------------1 KING2 JONES2 BLAKE2 CLARK3 TURNER3 ALLEN3 WARD3 MARTIN3 SCOTT4 ADAMS已选择10行。SCOTT@orcl#11* select level,lpad('',4*level-1)||ename as ename from emp
SCOTT@orcl#c /''/' '1* select level,lpad(' ',4*level-1)||ename as ename from emp
SCOTT@orcl#r1  select level,lpad(' ',4*level-1)||ename as ename from emp2  start with ename=UPPER('king')3  connect by prior empno=mgr4* order by levelLEVEL ENAME
---------- --------------------------------------------------1    KING2        JONES2        BLAKE2        CLARK3            TURNER3            ALLEN3            WARD3            MARTIN3            SCOTT4                ADAMS已选择10行。SCOTT@orcl#

说明：lpad（列名，填充长度，填充字符）

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