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SQL – NULL Values
SQL – NULL Values Table Of Contents: What Are NULL Values? Syntax Of NULL Values. Examples Of Null Values. (1) What Are NULL Values ? Sometimes users don’t enter every asked value in the input form. If a column doesn’t have any value in it there will be NULL inside it. Database replaces the empty values with ‘NULL’. A field with a NULL value is one that has been left blank during record creation! (2) Syntax Of NULL Values ? Syntax: NULL SELECT column_names FROM table_name WHERE column_name IS NULL; SELECT column_names FROM table_name WHERE column_name IS NOT NULL; Note:
