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I am not able to find more information about DUAL table.Can anyone please tell me where can I get information of DUAL and also about merge syntax?If a triggering statement omits a column list, the trigger is fired when any column of the associated table is updated. These statements are run if the triggering statement is entered and if the trigger restriction (if included) evaluates to CONNECT system/manager GRANT ADMINISTER DATABASE TRIGGER TO scott; CONNECT scott/tiger CREATE TABLE audit_table ( seq number, user_at VARCHAR2(10), time_now DATE, term VARCHAR2(10), job VARCHAR2(10), proc VARCHAR2(10), enum NUMBER); CREATE OR REPLACE PROCEDURE foo (c VARCHAR2) AS BEGIN INSERT INTO Audit_table (user_at) VALUES(c); END; CREATE OR REPLACE TRIGGER logontrig AFTER LOGON ON DATABASE -- Just call an existing procedure.A column list cannot be specified for CREATE TABLE Project_tab ( Prj_level NUMBER, Projno NUMBER, Resp_dept NUMBER); CREATE TABLE Emp_tab ( Empno NUMBER NOT NULL, Ename VARCHAR2(10), Job VARCHAR2(9), Mgr NUMBER(4), Hiredate DATE, Sal NUMBER(7,2), Comm NUMBER(7,2), Deptno NUMBER(2) NOT NULL); CREATE TABLE Dept_tab ( Deptno NUMBER(2) NOT NULL, Dname VARCHAR2(14), Loc VARCHAR2(13), Mgr_no NUMBER, Dept_type NUMBER); CREATE OR REPLACE VIEW manager_info AS SELECT e.ename, e.empno, d.dept_type, d.deptno, p.prj_level, p.projno FROM Emp_tab e, Dept_tab d, Project_tab p WHERE e.empno = d.mgr_no AND d.deptno = p.resp_dept; CREATE OR REPLACE TRIGGER manager_info_insert INSTEAD OF INSERT ON manager_info REFERENCING NEW AS n -- new manager information FOR EACH ROW DECLARE rowcnt number; BEGIN SELECT COUNT(*) INTO rowcnt FROM Emp_tab WHERE empno = :n.empno; IF rowcnt = 0 THEN INSERT INTO Emp_tab (empno,ename) VALUES (:n.empno, :n.ename); ELSE UPDATE Emp_tab SET Emp_tab.ename = :n.ename WHERE Emp_tab.empno = :n.empno; END IF; SELECT COUNT(*) INTO rowcnt FROM Dept_tab WHERE deptno = :n.deptno; IF rowcnt = 0 THEN INSERT INTO Dept_tab (deptno, dept_type) VALUES(:n.deptno, :n.dept_type); ELSE UPDATE Dept_tab SET Dept_tab.dept_type = :n.dept_type WHERE Dept_tab.deptno = :n.deptno; END IF; SELECT COUNT(*) INTO rowcnt FROM Project_tab WHERE Project_tab.projno = :n.projno; IF rowcnt = 0 THEN INSERT INTO Project_tab (projno, prj_level) VALUES(:n.projno, :n.prj_level); ELSE UPDATE Project_tab SET Project_tab.prj_level = :n.prj_level WHERE Project_tab.projno = :n.projno; END IF; END; triggers can also be created over nested table view columns. The ORA_LOGIN_USER is a function -- that returns information about the event that fired the trigger.) IS BEGIN LOOP BEGIN MERGE INTO Employee USING dual ON ( "id"=2097153 ) WHEN MATCHED THEN UPDATE SET "last"="smith" , "name"="john" WHEN NOT MATCHED THEN INSERT ("id","last","name") VALUES ( 2097153,"smith", "john" ); EXIT; -- success? Well, in that case you could also just catch the specific Java exceptions and retry in a Java loop. I'm just not volunteering to figure it out for you... NUFUS_MUHTARLIK B USING ( SELECT '028-01' CILT, '25' SAYFA, '6' KUTUK, '46603404838' MERNIS_NO FROM DUAL ) E ON (B.

To do this reliably, you need to catch this exception and either re-run the merge or do a simple update instead.

Oracle automatically executes a trigger when a specified event takes place, which may be in the form of a system event or a DML statement being issued against the table.

Triggers can be: Trigger names must be unique with respect to other triggers in the same schema.

In Oracle 10, you can use the "log errors" clause to make it continue with the rest of the rows when an error occurs and log the offending row to another table, rather than just stopping.

Hi, I tried to use same query pattern in my query but somehow my query is inserting duplicate rows.




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