If a user tries to insert data that doesn’t meet these requirements, Oracle will not allow so. Q15) What are integrity constraints?Īnswer: Data integrity allows defining certain data quality requirements that the data in the database needs to meet.
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If you need more than one out values then use procedures instead of functions. It is recommended not to use out parameters in functions. Variable: = PACKAGE NAME.FUNCTION NAME (arguments) ĮXEC SQL EXECUTE Q12) How to disable multiple triggers if a table at a time?Īnswer: ALTER table table_name DISABLE ALL TRIGGERS Q13) How we can create a table through procedure?Īnswer: You can create table from procedure using Execute immediate command.ĮXECUTE IMMEDIATE ‘CREATE TABLE temp AS SELECT * FROM emp ‘ ĮND Q14) In pl/sql what is the use of out parameter even though we have return statement.Īnswer: Without parameters you can get the more than one out values in the calling program. You can select from pseudocolumns, but you cannot insert, update, or delete their values.īecome a PL/SQL Certified Expert in 25Hours Q11) How packaged procedures are called from the stored procedure or anonymous block?Īnswer: PACKAGE NAME.PROCEDURE NAME (parameters) SELECT * FROM employees WHERE ROWNUM < 10 Ī pseudocolumn behaves like a table column, but is not actually stored in the table. You can use ROWNUM to limit the number of rows returned by a query, as in this example: The first row selected has a ROWNUM of 1, the second has 2, and so on. Rownum: For each row returned by a query, the ROWNUM pseudocolumn returns a number indicating the order in which Oracle selects the row from a table or set of joined rows.This datatype is primarily for values returned by the ROWID pseudocolumn. Row id: Hexadecimal string representing the unique address of a row in its table.Įxecutable statements ĮND Q10) Explain rowid,rownum ?What are the pseduocolumns we have? Syntax: Where current of cursor Q8) Give the structure of the function?Īnswer: CREATE OR REPLACE FUNCTION function_name(formal parameters list with only IN mode)ĮND function name Q9) Give the Structure of the procedure?Īnswer: CREATE OR REPLACE PROCEDURE procedure_name(Optional Parameters)
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Q7) Explain the usage of WHERE CURRENT OF clause in cursors?Īnswer: When referencing the current row from an explicit cursor,use the where current of clause.This allows you to apply updates and delete to the row currently being addressed,without the need to explicitly reference the rowid.You must include the for update clause in the cursor query on open.
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Because it is fired as part of the execution of the triggering statement.Triggers should not contain transaction control statements like commit, rollback, savepoint or set transaction.
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Q3) Can commit, rollback, savepoint be used in database triggers? If yes then how? If no why? With reasons