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The CREATE OR ALTER statement works with specific types of database objects such as stored procedures, functions, triggers and views. With this new CREATE OR ALTER statement, you do not need to add extra code to your script to check if the object exists in the SYSOBJECTS system table and then drop and re-create.

The ALTER TABLE command adds, deletes, or modifies columns in a table. The ALTER TABLE command also adds and deletes various constraints in a table.

ALTER Command is used to add, delete, modify the attributes of the relations (tables) in the database. UPDATE Command is used to update existing records in a database.

Use the ADD AUDIT clause with the ALTER TABLE command to include a table in selective row-level auditing. Use the ADD CONSTRAINT clause to specify a primary key, foreign key, referential, unique, or check constraint on a new or existing column or on a set of columns.

DEFAULT clause of ALTER TABLEUse the DEFAULT clause of the ALTER TABLE statement to specify value that the database server should insert in a column in DML operations that specify no explicit value for the column.

What does the ALTER TABLE clause do? Explanation: The ALTER TABLE statement is used to add, delete, or modify columns. Explanation: The SQL UPDATE Query is used to modify the existing records in a table. You can use WHERE clause with UPDATE query to update selected rows otherwise all the rows would be affected.

The ALTER command in SQL is used to make changes to a table, view, or the entire database. We can add, modify, and drop constraints, columns, and indexes using the ALTER command in SQL.