Oracle Alter Table | Alter Table Oracle - oracle tutorial - sql tutorial




Oracle drop column of a table

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What is Alter Table Statement in oracle ?

  • Alter Table Statement specifies how to add, modify, drop or delete columns in a table.
  • It is also used to rename a table.

Syntax:

ALTER TABLE TABLE_name  
ADD COLUMN_name column-definition;   
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Example:

  • Add a new column address into the table customers.
	Oracle alter table

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ALTER TABLE wikitechy_employee
ADD ADDRESS Varchar(30);  
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 add query in alter table
  1. Using the “Alter Query“ in this the table “wikitechy_employee” the new column “ADDRESS” has been added.
  2. Alter Query has been executed and the output is shown above.
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Oracle alter table with modify not null

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MODIFY COLUMN OF A TABLE:

  • To modify the column in a table, we have the syntax as follows:

Syntax:

Alter Table Table_Name  
                       Modify Column_Name Column_Type;   
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Example:

Alter Table Customers  
                     Modify Customer_Name Varchar2(100) Not Null; 
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 modify query in alter table
    • Alter Query is used to Change the name as a not null constraint in the “wikitechy_employee” table.

RENAME COLUMN OF A TABLE:

  • The RENAME COLUMN statement allows you to rename an existing column in an existing table (ie)old name to new name in the table.
	Oracle alter table rename column

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Syntax:

ALTER TABLE table_name  
                        RENAME COLUMN old_name to new_name;  
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Example:

ALTER TABLE customers  
                        RENAME COLUMN customer_name to cname;  
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 rename query in alter table
    1. By Using Rename Statement the column name has been changed from old name(“City”) to new name as(“place”) in the Wikitechy_employee table .
 rename output in alter table
    1. Since the Output of Rename statement as been changed from old name to new name column in the “wikitechy_employee” table, so we have executed the select statement to view the table.
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DROP COLUMN OF A TABLE:

  • It is used to drop a column in an existing table.

Syntax:

                             ALTER TABLE table_name  
                             DROP COLUMN column_name;  
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Example:

ALTER TABLE Wikitechy_employee  
                          DROP COLUMN Position;  
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 drop query in alter table
    • By Using Drop Statement the column “Position” will be deleted from the “wikitechy_employee” table.
 drop output in alter table
    1. Since the Output of Drop Statement has been deleted from “wikitechy_employee” table.

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