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First, we call the CREATE TABLE clause, followed by the name of the table.

NULL is not the same as an empty string or the number zero.

Add column is defined as add a new column to an existing table.

SET STORAGE: For setting the mode of storage for a column.

Any attempt to set the column to NOT NULL while actual NULL data remains in the column will result in an error and no change will occur.

This is quite a huge improvement.

You may also have a look at the following articles to learn more —• Definition of PostgreSQL NOT NULL PostgreSQL provides us with the NOT NULL constraint; by using NOT NULL, we can make sure that the columns in which we have mentioned NOT NULL constraint we do not accept any NULL value.

Here we discuss the Introduction and how not null works in PostgreSQL, along with different examples and its code implementation.

Making statements based on opinion; back them up with references or personal experience.