Practice exercise

Which of the following features are not available in SQL Developer?
1. Query builder.
2. Database export and import.
3. Database backup and recovery functions.
4. Code Subversion repository.
For a function to be called from a SQL expression, which of the following conditions should it obey?
1. A function in the SELECT statement should not contain DML statements.
2. The function should return a value.
3. A function in the UPDATE or DELETE statement should not query the same table.
4. A function called from a SQL expression cannot contain TCL (COMMIT or ROLLBACK) commands or DDL (CREATE or ALTER) commands.
The following query is executed in the SCOTT schema:
```
  SELECT NAME, referenced_owner, referenced_name
  FROM all_dependencies
  WHERE owner = USER
  AND referenced_type IN ('TABLE', 'VIEW')
  AND referenced_owner IN ('SYS')
  ORDER BY owner, NAME, referenced_owner, referenced_name;
```
Which statement is true about the output of this query?
1. It displays the schema objects, created by the user ORADEV, that use a table or view owned by SYS.
2. An exception occurs as user SCOTT has insufficient privileges to access ALL_DEPENDENCIES view.
3. It displays all PL/SQL code objects that reference a table or view directly for all the users in the database.
4. It displays only those PL/SQL code objects created by the user OE that reference a table or view created by the user SYS.
Which of the following is true about PL/SQL blocks?
1. Exception is a mandatory section without which an anonymous PL/SQL block fails to compile.
2. Bind variables cannot be referred inside a PL/SQL block.
3. The scope and visibility of the variables declared in the declarative section of the block are within the current block only.
4. The RAISE_APPLICATION_ERROR procedure maps a predefined error message to a customized error code.
From the following options, identify the ways of defining exceptions:
1. Declare an EXCEPTION variable and raise it using the RAISE statement.
2. Use PRAGMA EXCEPTION_INIT to associate a customized exception message to a pre-defined oracle error number.
3. Declare an EXCEPTION variable and use it in RAISE_APPLICATION_ERROR.
4. Use RAISE_APPLICATION_ERROR to create a dynamic exception at any stage within the executable or exception section of a PL/SQL block.
Choose the differences between procedures and functions:
1. A function must mandatorily return a value, while a procedure may or may not.
2. A function can be called from a SQL query, while a procedure can never be invoked from SQL.
3. A function can accept parameters passed by a value, while a procedure can accept parameters passed by reference only.
4. A standalone function can be overloaded but a procedure cannot.
Examine the values of the cursor attribute for the following query and pick the attribute with the wrong value:
```
  BEGIN
  …
  SELECT ENAME, SAL
  INTO L_ENAME, L_SAL
  FROM EMPLOYEES
  WHERE EMPID = 7900;
  …
  END;
```
1. SQL%ROWCOUNT = 1
2. SQL%ISOPEN = FALSE
3. SQL%FOUND = FALSE
4. SQL%NOTFOUND = FALSE

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Advanced Oracle PL/SQL Developer's Guide (Second Edition) - Second Edition

By : Saurabh K. Gupta

Advanced Oracle PL/SQL Developer's Guide (Second Edition)

By: Saurabh K. Gupta

Overview of this book

Practice exercise

Advanced Oracle PL/SQL Developer's Guide (Second Edition) - Second Edition

By : Saurabh K. Gupta

Advanced Oracle PL/SQL Developer's Guide (Second Edition)

By: Saurabh K. Gupta

Overview of this book

Practice exercise

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