lag/lead分析函数

LAG  (value_expression [,offset] [,default]) OVER ([query_partition_clase] order_by_clause)
LEAD (value_expression [,offset] [,default]) OVER ([query_partition_clase] order_by_clause)

 

• value_expression - 可以是一个列名也可以是一个内置函数
• offset - 偏移的行数默认为1.
• default - 如果是首行(lag)或末行(lead)的返回值. 默认值为 NULL.

SELECT empno,
       ename,
       job,
       sal
FROM   emp
ORDER BY sal;

     EMPNO ENAME      JOB              SAL
---------- ---------- --------- ----------
      7369 SMITH      CLERK            800
      7900 JAMES      CLERK            950
      7876 ADAMS      CLERK           1100
      7521 WARD       SALESMAN        1250
      7654 MARTIN     SALESMAN        1250
      7934 MILLER     CLERK           1300
      7844 TURNER     SALESMAN        1500
      7499 ALLEN      SALESMAN        1600
      7782 CLARK      MANAGER         2450
      7698 BLAKE      MANAGER         2850
      7566 JONES      MANAGER         2975
      7788 SCOTT      ANALYST         3000
      7902 FORD       ANALYST         3000
      7839 KING       PRESIDENT       5000

14 rows selected.

SQL>

 

 

SELECT empno,       ename,       job,       sal,       LAG(sal, 1, 0) OVER (ORDER BY sal) AS sal_prev,       sal - LAG(sal, 1, 0) OVER (ORDER BY sal) AS sal_diffFROM   emp;     EMPNO ENAME      JOB              SAL   SAL_PREV   SAL_DIFF---------- ---------- --------- ---------- ---------- ----------      7369 SMITH      CLERK            800          0        800      7900 JAMES      CLERK            950        800        150      7876 ADAMS      CLERK           1100        950        150      7521 WARD       SALESMAN        1250       1100        150      7654 MARTIN     SALESMAN        1250       1250          0      7934 MILLER     CLERK           1300       1250         50      7844 TURNER     SALESMAN        1500       1300        200      7499 ALLEN      SALESMAN        1600       1500        100      7782 CLARK      MANAGER         2450       1600        850      7698 BLAKE      MANAGER         2850       2450        400      7566 JONES      MANAGER         2975       2850        125      7788 SCOTT      ANALYST         3000       2975         25      7902 FORD       ANALYST         3000       3000          0      7839 KING       PRESIDENT       5000       3000       200014 rows selected.SQL>

SELECT empno,       ename,       job,       sal,       LEAD(sal, 1, 0) OVER (ORDER BY sal) AS sal_next,       LEAD(sal, 1, 0) OVER (ORDER BY sal) - sal AS sal_diffFROM   emp;     EMPNO ENAME      JOB              SAL   SAL_NEXT   SAL_DIFF---------- ---------- --------- ---------- ---------- ----------      7369 SMITH      CLERK            800        950        150      7900 JAMES      CLERK            950       1100        150      7876 ADAMS      CLERK           1100       1250        150      7521 WARD       SALESMAN        1250       1250          0      7654 MARTIN     SALESMAN        1250       1300         50      7934 MILLER     CLERK           1300       1500        200      7844 TURNER     SALESMAN        1500       1600        100      7499 ALLEN      SALESMAN        1600       2450        850      7782 CLARK      MANAGER         2450       2850        400      7698 BLAKE      MANAGER         2850       2975        125      7566 JONES      MANAGER         2975       3000         25      7788 SCOTT      ANALYST         3000       3000          0      7902 FORD       ANALYST         3000       5000       2000      7839 KING       PRESIDENT       5000          0      -500014 rows selected.SQL>
 
http://www.oracle-base.com/articles/misc/LagLeadAnalyticFunctions.php