oracle_analytical.sql

-- -----------------------------------------------------------------------------
-- Analytical Functions Examples
--
-- (see also https://oracle-base.com/articles/misc/lag-lead-analytic-functions)
-- -----------------------------------------------------------------------------

CREATE TABLE sbu_emp (
  empno    NUMBER(4) CONSTRAINT pk_emp PRIMARY KEY,
  ename    VARCHAR2(10),
  job      VARCHAR2(9),
  mgr      NUMBER(4),
  hiredate DATE,
  sal      NUMBER(7,2),
  comm     NUMBER(7,2),
  deptno   NUMBER(2)
);

INSERT INTO sbu_emp VALUES (7369,'SMITH','CLERK',7902,to_date('17-12-1980','dd-mm-yyyy'),800,NULL,20);
INSERT INTO sbu_emp VALUES (7499,'ALLEN','SALESMAN',7698,to_date('20-2-1981','dd-mm-yyyy'),1600,300,30);
INSERT INTO sbu_emp VALUES (7521,'WARD','SALESMAN',7698,to_date('22-2-1981','dd-mm-yyyy'),1250,500,30);
INSERT INTO sbu_emp VALUES (7566,'JONES','MANAGER',7839,to_date('2-4-1981','dd-mm-yyyy'),2975,NULL,20);
INSERT INTO sbu_emp VALUES (7654,'MARTIN','SALESMAN',7698,to_date('28-9-1981','dd-mm-yyyy'),1250,1400,30);
INSERT INTO sbu_emp VALUES (7698,'BLAKE','MANAGER',7839,to_date('1-5-1981','dd-mm-yyyy'),2850,NULL,30);
INSERT INTO sbu_emp VALUES (7782,'CLARK','MANAGER',7839,to_date('9-6-1981','dd-mm-yyyy'),2450,NULL,10);
INSERT INTO sbu_emp VALUES (7788,'SCOTT','ANALYST',7566,to_date('13-JUL-87','dd-mm-rr')-85,3000,NULL,20);
INSERT INTO sbu_emp VALUES (7839,'KING','PRESIDENT',NULL,to_date('17-11-1981','dd-mm-yyyy'),5000,NULL,10);
INSERT INTO sbu_emp VALUES (7844,'TURNER','SALESMAN',7698,to_date('8-9-1981','dd-mm-yyyy'),1500,0,30);
INSERT INTO sbu_emp VALUES (7876,'ADAMS','CLERK',7788,to_date('13-JUL-87', 'dd-mm-rr')-51,1100,NULL,20);
INSERT INTO sbu_emp VALUES (7900,'JAMES','CLERK',7698,to_date('3-12-1981','dd-mm-yyyy'),950,NULL,30);
INSERT INTO sbu_emp VALUES (7902,'FORD','ANALYST',7566,to_date('3-12-1981','dd-mm-yyyy'),3000,NULL,20);
INSERT INTO sbu_emp VALUES (7934,'MILLER','CLERK',7782,to_date('23-1-1982','dd-mm-yyyy'),1300,NULL,10);
COMMIT;

-- -----------------------------------------------------------------------------
-- RANK
-- -----------------------------------------------------------------------------
select  deptno,
        empno,
        ename,
        sal,
        rank() over (partition by deptno order by sal) as rnk
from    sbu_emp
order   by  deptno, sal
;

-- -----------------------------------------------------------------------------
-- LAG and LEAD
-- -----------------------------------------------------------------------------
with w_sal_list as
(
    select  empno,
            ename,
            job,
            sal,
            lag(sal, 1, 0) over (order by sal) as sal_prev,
            lead(sal, 1, 0) over (order by sal) as sal_next
    from    sbu_emp
)
select  *
from    w_sal_list
where   sal_prev = sal    

-- -----------------------------------------------------------------------------
-- FIRST_VALUE and LAST_VALUE
-- -----------------------------------------------------------------------------
select  empno,
        deptno,
        sal,
        last_value(sal) ignore nulls over (partition by deptno order by sal rows between unbounded preceding and unbounded following) as highest_in_dept,
        last_value(sal) ignore nulls over (                    order by sal rows between unbounded preceding and unbounded following) as highest_overall,
        last_value(sal) ignore nulls over (                    order by sal) as highest
from   sbu_emp
order   by  deptno,
            sal

col



select  *
from    bsi_case_step
;