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This would be easier if you didn't have that 3 row rule, is it really necessary? The second is the way I would do it -- i would just track the netsales for the last 3 regardless of whether they had 1, 2, 3, or more records.

(it would be easier from a programming perspective with or without the mutating table issue)... Its shows how simple the logic is then (regardless of mutating table or not -- the 3 row rule makes this *hard*).

[email protected] select * from t order by statement; CUSTID CUSTNAME STATEMENT NETSALES ---------- ------------------------- --------- ---------- 3 3 24-MAY-00 1000 4 4 24-MAY-00 10000 3 3 25-MAY-00 2000 4 4 25-MAY-00 20000 3 3 26-MAY-00 2500 4 4 26-MAY-00 25000 3 3 27-MAY-00 3000 4 4 27-MAY-00 30000 1 one 03-JUN-00 100 2 two 03-JUN-00 1000 1 one 04-JUN-00 200 2 two 04-JUN-00 2000 1 one 05-JUN-00 250 2 two 05-JUN-00 2500 1 one 06-JUN-00 300 2 two 06-JUN-00 3000 16 rows selected. Nope, it will not do what I want because there is this little thing called "multi-user concurrency" out there lurking about.

T_EMP", line 4 ORA-04088: error during execution of trigger 'OPS$TKYTE.T_EMP' when precisely one row is known to be modified -- insert values -- it permits the read as the read is known to be "not inconsistent" (just one row).I have a table customer as shown below: SQL select * from customer; CUSTID CUSTNAME STATEMENT NETSALES ---------- -------------------- --------- ---------- 1 best buy 08-JUN-99 1000 2 best buy 08-JUN-98 1000 3 best buy 08-MAY-00 2000 Datatypes are obvious!Now, when ever we have =3 rows PER CUSTOMER in this table(grab the latest 3 rows based on statement Date), my trigger should fire which executes a procedure which does calculations and dumps results in the OUTPUT table which is shown below with the one result for each customer Best Buy SQL select * from output; CUSTID CUSTNAME NETSALES_C NETSALES_2 NETSALES_3 ---------- -------------------- ---------- ---------- ---------- 1 best buy 2000 1000 1000 Since I need to know how many rows are there in customer table for every customer being updated/inserted in the customer table, I have to use AFTER INSERT OR UPDATE ROW trigger..that gives me mutating trigger error.So, the after INSERT OR UPDATE should be a row level trigger...

' On Delete'); END IF; END statement_level; / set serveroutput on INSERT INTO orders (somecolumn) VALUES ('ABC'); UPDATE orders SET somecolumn = 'ZZT'; DELETE FROM orders WHERE rownum CREATE TABLE person ( fname VARCHAR2(15), lname VARCHAR2(15)); CREATE TABLE audit_log ( o_fname VARCHAR2(15), o_lname VARCHAR2(15), n_fname VARCHAR2(15), n_lname VARCHAR2(15), chng_by VARCHAR2(10), chng_when DATE); BEGIN INSERT INTO audit_log (o_fname, o_lname, n_fname, n_lname, chng_by, chng_when) VALUES (: OLD.fname, : OLD.lname, : NEW.fname, : NEW.lname, USER, SYSDATE); END referencing_clause; / INSERT INTO person (fname, lname) VALUES ('Dan', 'Morgan'); SELECT * FROM person; SELECT * FROM audit_log; UPDATE person SET lname = 'Dangerous'; SELECT * FROM person; SELECT * FROM audit_log; UPDATE person SET fname = 'Mark', lname = 'Townsend'; SELECT * FROM person; SELECT * FROM audit_log; COMPOUND TRIGGER BEFORE STATEMENT IS BEGIN ...

TRIGGED", line 4 ORA-04088: error during execution of trigger 'DSSADMIN. update emp set empno=empno where rownum=1; 1 row updated. insert trigger does not fire, hence I would be surprised to see a mutating table constraint.