06 qmds2005 session08

Querying and Managing Data Using SQL Server 2005
Objectives

In this session, you will learn to:
Manipulate data by using Data Manipulation Language
statements
Manipulate the Extensible Markup Language data

Ver. 1.0 Session 8 Slide 1 of 20

Storing Data in a Table

Data can be stored in a table:
By adding data in the form of rows
By using the INSERT statement
Syntax:
INSERT [INTO] {table_name} [(column_list)]
VALUES {DEFAULT | values_list |
select_statement}
Let’s see how…


Storing Data in a Table (Contd.)

Data can be inserted in a table in the following ways:
By inserting partial data
By inserting data in related tables
By copying data from an existing table into a new table
Let’s see how…


Just a minute

Which statement allows you to insert data in a table?

Answer:
INSERT INTO


Just a minute

Which statement allows you to copy contents of one table
into another table?

Answer:
SELECT INTO


Updating Data in a Table

Data in a table can be updated:
When there is a change in the data
By using the UPDATE statement
Syntax:
UPDATE table_name
SET column_name = value [, column_name =
value]
[FROM table_name]
[WHERE condition]
Let’s see how…


Just a minute

Which statement allows you to modify data in a database?

Answer:
UPDATE


Deleting Data from a Table

Data in a table can be deleted :
When the data is no longer required
By using the DELETE statement
Syntax:
DELETE [FROM] table_name
FROM table(s)]
WHERE condition]
Let’s see how…


Deleting Data from a Table (Contd.)

While deleting data from related tables:
Ensure that first the records are deleted from the table that
contains foreign key and then from the table that contains the
primary key
Delete all records from a table:
Using the DELETE statement or the TRUNCATE TABLE
statement
Syntax:
TRUNCATE TABLE table_name
Let’s see how…


Just a minute

Which statement allows you to delete a single row from a
table?

Answer:
DELETE table_name


Demo: Manipulating Data in Tables

Problem Statement:
You are the database developer in AdventureWorks, Inc. As a
part of the regular database operations, you need to
implement the following changes in the AdventureWorks
database:
1. The management has decided to create a new department named
Inventory Control under the Inventory Management group. You
need to add the details of this new department into the
Department table. The details should adhere to the structure of the
Department table.
2. Change the department names for the following employees to the
Inventory Control department:
Vamsi N. kuppa
Susan W. Eaton
The Department ID of the Inventory Control department is 17.


Demo: Manipulating Data in Tables (Contd.)

Solution:
To solve the preceding problem, you need to perform the
following tasks:
1. Insert a new record in the Department table.
2. Update the employee details to change the department.
3. Verify that data is inserted and modified.


Storing XML Data in a Table

Flash presentation: Introduction to XML
Store XML data in a table:
By using XML data type
By transforming XML data into a rowset


Storing XML Data in a Table (Contd.)

Storing XML data in a rowset involves the following tasks:
1. Parsing the XML document.
2. Retrieving a rowset from the tree.
3. Storing the data from the rowset.
4. Clearing the memory.
Let’s see how…


Retrieving the XML Data from a Table

Involves extracting data from a table in the form of well-
formed XML fragments
Is performed by using:
FOR XML clause in the SELECT statement
XQuery language


Retrieving the XML Data from a Table (Contd.)

FOR XML:
Retrieves the XML data using the following directives:
• RAW: Is used to return an xml file with each row representing an
XML element
• AUTO: Is used to return query results as nested XML elements
• PATH: Is used to return specific values by specifying the column
names for which you need to return the data
• EXPLICIT: Is used to return an XML file that gets the format as
specified in the SELECT statement
Let’s see how…


Just a minute

Which clause is used to extract data from a table in the XML
format?

Answer:
FOR XML clause is used to extract data from a table in
the XML format.


Modifying XML Data

Is performed by using the modify function, which allows to
perform the following operations:
Insert: Used to add nodes to XML in an XML column or
variable
Replace: Used to update the XML data
Delete: Used to remove a node from the XML data
Let’s see how…


Summary

In this session, you learned that:
The INSERT statement is used to insert data into the table.
While inserting data into a table, the data type of the
information must match the data types of the columns of the
table.
It is not essential to insert data into a column that allows NULL
or has a default constraint assigned to it.
You can copy contents from one table into another table by
using the SELECT INTO command.
The SQL Server provides a row update statement called
UPDATE to modify values within tables.


Summary (Contd.)

You can delete a row from a table by using the DELETE
statement.
You use the TRUNCATE TABLE statement to remove all the
rows from a table.
SQL Server 2005 uses XML as a data type to save the XML
data in its original state.
The SQL Server allows you to shred the XML data by using the
OPENXML statement.
You can use the FOR XML clause of the SELECT statement to
retrieve the XML data in different ways by using the RAW,
AUTO, PATH, EXPLICIT modes.
You can modify the XML data by using the modify function
provided by the XML data type.
Using the modify function, you can insert, update, or remove
a node from the XML data.


06 qmds2005 session08

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