What is a blank field in SQL?

Is blank and NULL same in SQL?

In database terms, however, a null value is a value that doesn't exist: the field does not contain a value of any kind (not even a blank value). By contrast, a blank value is a real value: it just happens to be a string value containing 0 characters.

How do I query a blank field in SQL?

SELECT * FROM yourTableName WHERE yourSpecificColumnName IS NULL OR yourSpecificColumnName = ' '; The IS NULL constraint can be used whenever the column is empty and the symbol ( ' ') is used when there is empty value.

Is Blank vs NULL?

Blank and NULL are two different types of data. In a string that is empty or blank, a value is not known, but is just empty. Null can be a value or an absence of one. In a database where as Empty is used for string fields, Null can be used for strings, Integers, dates, or any other field.

What is a NULL field?

Null indicates there is no value within a database field for a given record. It does not mean zero because zero is a value. Blank indicates there is a value within a database but the field is blank.