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Oracle 9i
Nested Tables
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Creating an Object
Create an object which will store the data that is requiredas
part of nested table.
Create or Replace Type MultiAddress
asobject
(
PermanentAddress Varchar2(100),
CurrentAddress Varchar2(100)
);
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Creating Table of Object
Create a Table from the object created for the nestedtable to be
used as data type specification for the nestedtable in the
container tables definition.
Create Type StudentsMultiAddressas
Table of MultiAddress;
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Create Nested Table
A nested table is stored in the container table as acolumn
definition.
The actual data for the nested table is stored separatefrom the
container table.
We cannot directly query on the nested table.
Create Table Students(
RollNo char(4) Primary Key Check (RollNo like 'S%'),Name
varchar2(100) Not Null,
Address StudentsMultiAddress) Nested Table Address Store As
StudentsAddress;
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Viewing the structure of Table
To view the complete structural details of the containertable
the user must issue the following commands.
Set Describe Depth All;
Describe Students;
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Inserting Data Data can be inserted in container table as:
Insert into Students Values('&RollNo',
'&Name',StudentsMultiAddress(
MultiAddress('PAddress 1 Tuple 1', 'CAddress 1
Tuple1'),MultiAddress(PAddress 2 Tuple 1', 'CAddress 2
Tuple1'),MultiAddress(PAddress 3 Tuple 1', 'CAddress 3
Tuple1'),MultiAddress(PAddress 4 Tuple 1', 'CAddress 4
Tuple1'),
MultiAddress(PAddress 5 Tuple 1', 'CAddress 5 Tuple 1'))
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Viewing Data
The data stored in the table containing nested table canbe
viewed by the simple select statement.
Select * from Students;
The following query is not allowed.
Select * from StudentsAddress;
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Querying Data of Nested Table
The data of the nested table is queried by using thetable
function of oracle and an alias name can be usedfor the nested
table.
Select RollNo,SA.PermanentAddress,SA.CurrentAddressfrom
students, Table (Students.Address) SA
where SA.CurrentAddress = 'CAddress 5 Tuple 1';
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Inserting Data in Nested Table Data can be added to the nested
table column of the
container table by using the table function of oracle likethe
following command.
Insert into Table
(
Select Address From Students where RollNo='S001
)
Values
(MultiAddress (PAddress 6 Tuple 1','CAddress 6 Tuple 1
)
);
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Updating Nested Table Contents
The data of the Nested Table can be updated by usingthe table
function of oracle alias name can be used torefer the nested
table.
Update Table(
Select Address From Students
Where RollNo=S001
) SA
Set SA.CurrentAddress = 'UCAddress 6 Tuple 1'
Where SA.CurrentAddress = 'CAddress 6 Tuple 1';
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Deleting Data from Nested Table
The data of the Nested Table can be updated by usingthe table
function of oracle alias name can be used torefer the nested
table.
Delete Table(
Select Address From Students
Where RollNo='S001
) SA
Where SA.CurrentAddress = UCAddress 6 Tuple 1';
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