What represents no value in database?

What represents no value in SQL?

The SQL NULL is the term used to represent a missing value. A NULL value in a table is a value in a field that appears to be blank. A field with a NULL value is a field with no value. It is very important to understand that a NULL value is different than a zero value or a field that contains spaces.

What is a NULL value in a database?

A null value in a relational database is used when the value in a column is unknown or missing. A null is neither an empty string (for character or datetime data types) nor a zero value (for numeric data types).

Is NULL 0 in SQL?

SQL's coalesce turns a null value into another value. The example returns the result of the expression, unless it is null , then it returns zero ( 0 ).

IS NULL value same as zero?

A NULL value is not same as zero or a blank space. A NULL value is a value which is 'unavailable, unassigned, unknown or not applicable'. Whereas, zero is a number and blank space is a character.