Comparing 2 queries

Question

SQL> desc hr_pay_slip_mst
Name                            Null?    Type
SEQ_NO                          NOT NULL NUMBER
EMPNO                                    VARCHAR2(5)
DATED                                    DATE
ENT_BY                                   VARCHAR2(3)
ENT_DT                                   DATE
CHQ_NO                                   VARCHAR2(15)
SQL> desc hr_pay_slip_dlt
ERROR:
ORA-04043: object hr_pay_slip_dlt does not exist
SQL> desc hr_pay_slip_dtl
Name                            Null?    Type
SEQ_NO                                   NUMBER
PAY_CODE                                 VARCHAR2(3)
AMOUNT                                   NUMBER(12,3)
ENT_BY                                   VARCHAR2(3)
ENT_DT                                   DATE
SQL> desc hr_pay_heads_setup
Name                            Null?    Type
PAY_CODE                        NOT NULL VARCHAR2(3)
PAY_HEAD_NAME                            VARCHAR2(52)
PAY_HEAD_ABRV                            VARCHAR2(10)
ACCODE                                   VARCHAR2(7)
PAY_TYPE                                 VARCHAR2(1)
STATUS                                   VARCHAR2(1)
PERCENT_OF_BASIC                         NUMBER(4,2)
ENT_BY                                   VARCHAR2(3)
ENT_DT                                   DATE
SQL> desc emp
Name                            Null?    Type
EMPNO                           NOT NULL VARCHAR2(5)
ENAME                           NOT NULL VARCHAR2(100)
ENT_DT                                   DATE
ENT_BY                                   VARCHAR2(3)
STATUS                                   VARCHAR2(1)My query
SELECT ALL a.ENAME, a.bank_cd, c.DATED,BNK_ACCT_NUMBER,sum(decode(pay_type,'E',amount)) - NVL(sum(decode(pay_type,'D',amount)),0)as Amount,grp_cd,desig_code
FROM EMP a, HR_PAY_SLIP_MST c, HR_PAY_SLIP_DTL d, HR_PAY_HEADS_SETUP b
WHERE ((c.EMPNO = a.EMPNO)
AND (d.SEQ_NO = c.SEQ_NO)
AND (d.PAY_CODE = b.PAY_CODE))
and dated='30-jun-2010'
group by  a.ENAME, a.BANK_CD, c.DATED,BNK_ACCT_NUMBER,grp_cd,desig_code
order by grp_cd,desig_codeBy this query I will get Employee with his Current Salary of the month i.e. june 2010
Now I want to compare Salary of an employee with his last month salary if there is any difference.other wise not show.
i want this Result
Ename              Amount(current)                  Amount(Last Month)
xxxx                   10000                                          12000
abc                      7908                                          12345
and so on

Answer 1

Hi,
you can also do something like this:
WITH salmonth AS
     (SELECT ALL a.empno,
                 a.ENAME,
                 a.bank_cd,
                 c.DATED,
                 BNK_ACCT_NUMBER,
                   SUM(DECODE(pay_type,
                              'E', amount
                 - NVL(SUM(DECODE(pay_type,
                                  'D', amount
                                 )), 0) AS Amount,
                 grp_cd,
                 desig_code
      FROM       EMP a,
                 HR_PAY_SLIP_MST c,
                 HR_PAY_SLIP_DTL d,
                 HR_PAY_HEADS_SETUP b
      WHERE      (    (c.EMPNO = a.EMPNO)
                  AND (d.SEQ_NO = c.SEQ_NO)
                  AND (d.PAY_CODE = b.PAY_CODE)
      GROUP BY   a.empno,
                 a.ENAME,
                 a.BANK_CD,
                 c.DATED,
                 BNK_ACCT_NUMBER,
                 grp_cd,
                 desig_code
      ORDER BY   grp_cd,
                 desig_code)
SELECT sm1.ENAME,
       sm1.bank_cd,
       sm1.BNK_ACCT_NUMBER,
       sm1.grp_cd,
       sm1.desig_code,
       sm1.Amount,
       sm2.Amount
FROM   salmonth sm1,
       salmonth sm2
WHERE  sm1.dated = '30-jun-2010'
AND    sm2.dated = ADD_MONTHS(sm1.dated, -1)
AND    sm2.empno = sm1.empno
AND    sm2.Amount != sm1.Amount