Here is the some of the important points about Alter table statement.

The table must be contained in your schema To alter a table, or you should either have ALTER object privilege for the table or the ALTER ANY TABLE system privilege.

If a view, materialized view, trigger, function-based index, check constraint, function, procedure of package depends on a base table, the alteration of the base table or its columns can affect the dependent object For example plsql objects become invalid if the dependent table object is changed and you have to make them valid again.

Use the RENAME COLUMN clause of the ALTER TABLE statement to rename a column.

All constraints, indexes, and statistics defined on the column are also removed.

This command is most often used with ADD, DROP and MODIFY statements depending on the operation that you wish to perform for the table, its columns, or indexes.

We can even change the sequence of the columns in the table using the ALTER TABLE command.

In this article, we will learn the syntax and the usage of the ALTER TABLE command statement to add the column to a table with the help of examples.

The default position where the new column is added is at the last.

The datatype of rate will be decimal with precision and scale as (5,2) and the datatype of joiningdate should be DATE.

We can write the ALTER TABLE query with ADD statement in it to add two columns in the following way.

For this we can make the use of ALTER TABLE statement with ADD command and the query will be somewhat like this.

We can do so, by executing the following ALTER TABLE command.

The default value of integer datatype column is 0, varchar i.e string is blank and for date is NULL.

The default value of the newly added columns depends on the value of the SQL mode.

When we use the ADD statement with ALTER TABLE command then we can add single or multiple columns to the existing tables and define the constraints and restrictions along with the data type of the new column to be added using ALTER TABLE command.

Here we discuss Introduction, syntax, Description, and Example using command-line with code implementation.

You can also go through our other related articles to learn more.

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Alter Table Add Column