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Oracle Interview Questions And Answers
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17. A query fetched 10 records How many times does a PRE-QUERY Trigger and POST-QUERY Trigger will get executed ? PRE-QUERY fires once. POST-QUERY fires 10 times. 18. What is the difference between ON-VALIDATE-FIELD trigger and a POST-CHANGE trigger ? When you changes the Existing value to null, the On-validate field trigger will fire post change trigger will not fire. At the time of execute-query post-chage trigger will fire, on-validate field trigger will not fire. 19. What is the difference between an ON-VALIDATE-FIELD trigger and a trigger ? On-validate-field trigger fires, when the field Validation status New or changed. Post-field-trigger whenever the control leaving form the field, it will fire. 20. What is the difference between a POST-FIELD trigger and a POST- CHANGE trigger ? Post-field trigger fires whenever the control leaving from the filed. Post-change trigger fires at the time of execute-query procedure invoked or filed validation status changed. 21. When is PRE-QUERY trigger executed ? When Execute-query or count-query Package procedures are invoked. 22. Give the sequence in which triggers fired during insert operations, when the following 3 triggers are defined at the smae block level ? a. ON-INSERT b. POST-INSERT c. PRE-INSERT PRE-INSERT,ON-INSERT & POST-INSERT. 23. Can we use GO-BLOCK package in a pre-field trigger ? No. 24. Is a Keystartup trigger fires as result of a operator pressing a key explicitly ? No. 25. How can you execute the user defined triggers in forms 3.0 ? Execute_Trigger (trigger-name) 26. When does an on-lock trigger fire ? It will fires whenever SQL * Forms would normally attempt to lock a row. |