Chapter 11 - SQL SERVER NULL VALUE | What is NULL VALUE in SQL SERVER in HINDI
TOPIC: sql server null check. sql server null or empty. what is null in sql server. null values in sql. what is null value in sql.
A Column with NULL Value means a column with no value.
When a Column in SQL Server Table is Optional then it is possible to Insert, Update a record without adding a value in this column then the column will be saved with NULL value. NULL value and blank is different a NULL is that which has been left blank at the time record creation.
HOW TO CHECK NULL VALUE
It is not possible to check null value with comparison operators, such as equal to, less than, greater than, not equal to etc. We will have to use IS NULL or IS NOT NULL operators instead or comparison operators.
IS NULL Syntax: Select * From Table_Name Where Column_Name Is Null
IS NOT NULL Syntax: Select * From Table_Name Where Column_Name Is Not Null
NULL means nothing or not value or missing value NOT NULL means not empty value Zero or Blank is different from NULL it means user has given field value as zero or white space.
Operators in SQL SERVER: • Chapter 5 - What is SQL AND, OR and NOT Op...
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