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CREATE TABLE t ("S_NUM" int, "EFF_DATE" date, "AMOUNT" int) ;
ALTER SESSION SET NLS_DATE_FORMAT = 'DD-MON-YYYY';
INSERT ALL INTO t ("S_NUM", "EFF_DATE", "AMOUNT") VALUES (1, '07-Oct-2018', 110) INTO t ("S_NUM", "EFF_DATE", "AMOUNT") VALUES (1, '06-Oct-2018', 50) INTO t ("S_NUM", "EFF_DATE", "AMOUNT") VALUES (2, '07-Oct-2018', 200) INTO t ("S_NUM", "EFF_DATE", "AMOUNT") VALUES (2, '06-Oct-2018', 150) SELECT * FROM dual ;
4 rows affected
SELECT s_num,SUM (CASE WHEN eff_date >= trunc(sysdate) AND eff_date < TRUNC(sysdate) + 1 THEN amount WHEN eff_date >= trunc(sysdate) - 1 AND eff_date < TRUNC(sysdate) THEN - amount END) as diff FROM t GROUP BY s_num;
S_NUM
DIFF
1
60
2
50
SELECT s_num, diff FROM (SELECT s_num, eff_date, amount - LAG(amount, 1, 0) OVER ( partition BY s_num ORDER BY eff_date ) AS diff FROM t) WHERE eff_date >= trunc(sysdate) AND eff_date < trunc(sysdate) + 1 ;
S_NUM
DIFF
1
60
2
50