What is the use of IFNULL and ISNULL in SQL?

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With example

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TheDataMonk 55 years 6 Answers 2168 views Grand Master 0

Answers ( 6 )

  1. swap007
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    The IfNULL() and ISNULL() function lets you return an alternative value if the expression is NULL
    Example:
    select empname, IFNULL(salary,0) from employees.
    Here, if the value of salary is NULL it will return 0 while querying the table.

    IFNULL() is used in MySql
    ISNULL() is used in SQL Server

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    IFNULL() and ISNULL() are two functions in sql to check the existence of null values in a particular column and replace with a value depending on the type of DB used.

    ISNULL() in Sql server:- Checks for the null values and if it’s present it returns with an alternate value.
    ISNULL(column_name, value_to_be_replaced)

    ISNULL() in MYSQL :- Checks the column value if it is null or not null. It returns a boolean result.

    IFNULL in MYSQL :- Checks for the null values and if it’s present it returns with an alternate value.
    IFNULL(column_name, value_to_be_replaced)

  3. Ognish
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    IFNULL() is used in MySql
    ISNULL() is used in SQL server
    Both these functions when encounters a null value in a particular column returns a specified value as mentioned by the user

  4. Sai
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    ISNULL()- Is used in both mysql and SQL server
    SQL server — ISNULL(arugument1,argument2) -Returns argument2 if the argument 1 is NULL else will return Argument1
    MYSQL – If the expression is null this will return 1 if the expression is not null this will return 0.It returns a boolean result

    IFNULL() – Used in Mysql
    It takes 2 conditions and returns the first condition if it is not null and returns the second condition
    IFNULL( Condition1, condition2)

  5. sakshi31
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    Both are used to identify null values for a specified column.
    Major difference is IS NULL is used in SQL server database and IF NULL is used in MySQL database.

  6. Raahul
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    IFNULL is used to replace the null with a specified value, in a column. It returns a non-null value (if there is no null), else returns the replacement value.
    for example – select ifnull(col_name,value)

    ISNULL checks for the presence of null in a column.
    for example – select * from table where col_name is null

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