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Programming PL/SQL
Querying Object Tables
Using Oracle Objects
Object Oriented Terms
Query Object Tables
Collections Varrays Oracle
Querying Nested Tables
Practical/SQL Examples
Querying Complex Object
Alternate Query Example
Object Relational Summary
Querying Related Tables
Understanding Related Object Tables
Analyzing Dangling References
Writing deref Queries
Querying Object Tables
Creating PL/SQL Block
Object Relational Conclusion
Querying Nested Tables
Flattening nested Table
Query Flattens Nested Table
Simple varray Query
Query to Flatten varray
Flatten varray - Exercise
Procedure retrieves Nested Table
Varrays Nested Table Conclusion
Object Table Modification
Modifying Object Tables
Insert into Table
SQL Insert Rows
SQL Update Object Table
Subquery in Update
Delete Rows from Table
DML Statements Conclusion
Modifying Nested Tables
Modifying nested Varrays
Insert Rows into Table
Varray insert Command
Updating nested Table Rows
Updating Varray Rows
Delete Nested varray Command
Delete Entire Array
Nested Tables Conclusion
Modifying LOBs
Types Oracle Lobs
CreateTable Using LobColumn
Dbms_lob Package Components
Retrieving Large Object
Inserting LobData Technique
Inserting Lob Data
Updating Lob Data
Deleting Lob Data
Modify Table Lob Conclusion
Erasing Data within LOB - Exercise
Erasing Data within a LOB
Objective:
Use PL/SQL to erase portions of data within a LOB column.
Exercise scoring
This exercise is auto-scored.
Background and Overview
In this exercise, you will erase data within a LOB column using PL/SQL.
This exercise uses a simulation of an Oracle environment.
Instructions
In the following simulation exercise, you will be asked to perform a task or set of tasks you have learned in the previous lesson. The instructions will tell you what you need to do at each step but will not tell you exactly how.
Submitting your exercise
Click the
Submit
button when finished to see the suggested results for the exercise.
Log On
User Name:
Password:
Host String:
OK
Cancel
Description of Relevant Features: The login screen of "Oracle SQL*Plus", an older graphical interface for connecting to an Oracle database. Key features:
User Name, Password, Host String Fields
: These are input fields where the user must enter their Oracle database credentials:
User Name
: The Oracle database user name.
Password
: The corresponding password for the user.
Host String
: Used to specify the database instance (could be a TNS connection string or service name).
OK and Cancel Buttons
: These buttons allow users to either attempt the login or cancel the operation.
The design and overall layout, including the grey buttons and title bar, reflect a legacy interface, possibly from the late 1990s or early 2000s.
Menu bar
: Contains basic options like
File
,
Edit
,
Search
,
Options
, and
Help
, which are standard for the SQL*Plus client to manage connections, edit sessions, or seek help.
This interface is no longer in use in modern Oracle Database environments, as it has been replaced by more advanced tools, such as Oracle SQL Developer.
2) Erasing data with LOB 2
3) Erasing data with LOB 3
4) Erasing data with LOB 4
5) Erasing data with LOB 5
6) Erasing data with LOB 6
7) Erasing data with LOB 7
With SQL*Plus, connect to the database by using PETSTORE as the User Name, GREATPETS as the Password, and MYDB as the Host String. Approve the entries.
User Name
PETSTORE
S0)Type PETSTORE in the User Name box.
Password,
GREATPETS
(S0)Type GREATPETS in the Password box.
Host String,
MYDB
Type MYDB in the Host Name box
You are now connected to the database. Next, start the PL/SQL block by declaring two variables: one to store the value of the LOB and the other for the number of bytes to be erased.