What's more, we can wrap up the whole transformation process into this one Oracle MERGE command, referencing the external table and the table function in the one command as the source for the MERGED Oracle data.
There are two types of triggers based on the which level it is triggered.
The MERGE statement is designed to combine multiple operations to reduce the complexity of mixed insert and update operations.
MERGE allows you to avoid multiple INSERT, UPDATE, and DELETE DML statements by combining the operations into a single statement.
-- Creating TRIGGER CREATE OR REPLACE TRIGGER trg_before_emp_update BEFORE UPDATE OF JOB_EXPERIENCE, LAST_APPLIED_DATE on job_openings FOR EACH ROW DECLARE years_since_last_applied number(5); BEGIN years_since_last_applied := -1; IF(: NEW. He is working in a well reputed MNC as an applications Developer with 5 years of experience.
LAST_APPLIED_DATE IS NOT NULL) THEN SELECT MONTHS_BETWEEN(TO_DATE(sysdate,'DD-MON-YYYY'), TO_DATE(: NEW. -- Try to update job_experience less than 3 years UPDATE job_openings SET JOB_EXPERIENCE = 2 where APPLICATION_ID = 1; -- error Error report - ORA-20000: Job experience must be more than or equal to 3 years. TRG_BEFORE_EMP_UPDATE", line 21 ORA-04088: error during execution of trigger 'SYSTEM. CREATE TABLE bank_transactions ( TXN_ID number(10) primary key, TXN_NUMBER varchar2(20), PARTY_NAME varchar2(50), TXN_DATE date, CREATED_BY varchar2(20), CREATED_DATE date ); --Creating bank_transactions_audit table. He have good understanding and knowledge of Java, Database, Spring, Hibernate and exploring other technologies related to Software development.