The syntax for thecolumn-definitionfor a new column is almost the same as for a column in a CREATE TABLE statement. This syntax allows a column constraint to be placed on the new column within the ALTER TABLE AD
The syntax for the ALTER TABLESPACE statement in Oracle/PLSQL is: ALTER TABLESPACE tablespace_name { DEFAULT [ { COMPRESS | NOCOMPRESS } ] storage_clause | MINIMUM EXTENT integer [ K | M | G | T | P | E ] | RESIZE integer [ K | M | G | T | P | E ] | COALESCE | RENAME...
Let's look at an example that uses the ALTER TABLE statement to modify more than one column. In this example, we will modify two columns calledsupplier_nameandcity. For Oracle: ALTER TABLE supplier MODIFY (supplier_name char(100) NOT NULL, city char(75)); ...
We use the following SQL statement: ALTERTABLEPersons ALTERCOLUMNDateOfBirth year; Notice that the "DateOfBirth" column is now of type year and is going to hold a year in a two- or four-digit format. DROP COLUMN Example Next, we want to delete the column named "DateOfBirth" in the ...
Summary: in this tutorial, you will learn how to use the Oracle ALTER TABLE ADD column statement to add one or more columns to a table. Introduction to Oracle ALTER TABLE ADD column statement To add a new column to a table, you use the ALTER TABLE statement as follows:...
Many clauses of the ALTER TABLE statement have the same functionality they have in a CREATE TABLE statement. For more information on such clauses, please see CREATE TABLE. Note: Operations performed by the ALTER TABLE statement can cause Oracle to invalidate procedures and stored functions that...
Starting in Oracle 9i Release 2, you can now rename a column. To rename a column in an existing table, the ALTER TABLE syntax is: ALTER TABLE table_name RENAME COLUMN old_name to new_name; For Example: ALTER TABLE supplier RENAME COLUMN supplier_name to sname; ...
Oracle ALTERTABLECustomersMODIFYageVARCHAR(2); PostgreSQL ALTERTABLECustomersALTERCOLUMNageTYPEVARCHAR(2); Here, the SQL command changes the data type of theagecolumn toVARCHARin theCustomerstable. Note:This command is not supported by SQLite. ...
SQL Script: Adding Columns in DB Table Copy ALTER TABLE Employee ADD Address VARCHAR(100), City VARCHAR(25), PinCode integer;The following ALTER command adds Address, city, and Pin Code columns to the Employee table in Oracle database. Notice that it supports the different data types. ...
When a deadlock occurs, Oracle database automatically: a. Waits 300 seconds before terminating both sessions b. Terminates one statement with an error in one session c. Terminates the statements with an error in both sessions d. Takes no action by default and leaves it to the DBA ...