The MySQL ISNULL() function is used for checking whether an expression is NULL or not. This function returns 1 if the expression passed is NULL, else it returns 0. The ISNULL() function accepts the expression as a parameter and returns an integer a value 0 or 1 depending on the parameter passed.

Likewise, people ask, is null or Isnull?

Is Null and IsNull() both find null values, but you won't use them in the same way. You would use Is Null and Is Not Null in query expressions and SQL WHERE clauses. IsNull(), on the other hand, is a Visual Basic for Applications (VBA) function and would be used only in VBA modules.

iS NULL THEN 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 ).

In this manner, how do I use Ifnull in MySQL?

IFNULL() function MySQL IFNULL() takes two expressions and if the first expression is not NULL, it returns the first expression. Otherwise, it returns the second expression. Depending on the context in which it is used, it returns either numeric or string value.

What does NVL stand for?

null value logic

Related Question Answers

IS NULL function access?

The IsNull() function checks whether an expression contains Null (no data). This function returns a Boolean value. TRUE (-1) indicates that the expression is a Null value, and FALSE (0) indicates that the expression is not a Null value.

What is NVL in SQL?

SQL > SQL NULL > NVL Function. The NVL( ) function is available in Oracle, and not in MySQL or SQL Server. This function is used to replace NULL value with another value. It is similar to the IFNULL Function in MySQL and the ISNULL Function in SQL Server.

Is null in IIf statement?

IIf([partnumber] Is Null, If that condition is evaluates to True, then whatever follows the first comma is evaluated IIf([partnumber] Is Null,”0″ <– so if partnumber IS null, the value (in this case text) “0” is the result of the IIF() function call.

Is null in case statement SQL?

The SQL CASE Statement

The CASE statement goes through conditions and returns a value when the first condition is met (like an IF-THEN-ELSE statement). If no conditions are true, it returns the value in the ELSE clause. If there is no ELSE part and no conditions are true, it returns NULL.

What is coalesce in SQL?

What is COALESCE? COALESCE is a built-in SQLServer Function. Use COALESCE when you need to replace a NULL with another value. It takes the form: COALESCE(value1, value2, , valuen) It returns the first non NULL from the value list.

How do you handle null in SQL?

Both are used to handle the NULL value in T-SQL.

Functions and Operators for Handling NULL Values.

1.SQL Server standard.
2.Returns the first argument if it is not NULL .
3.Returns the second argument if it is NULL .
4.Syntax: ISNULL(argument1,argument2) argument1: Expression argument2: Replacement value

What is null value?

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 null in MySQL?

In MySQL, a NULL value means unknown. A NULL value is different from zero ( 0 ) or an empty string ” . A NULL value is not equal to anything, even itself. You can use a NULL value in the INSERT statement to specify that the data is missing. For example, the following statement inserts a row into the leads table.

Is null in tableau?

The IFNULL function basically runs a true/false test on whether the value in the tested field is NULL. The first value in the function is used if the value is not null, and the second is used if it is null.

How do I concatenate in MySQL?

MySQL CONCAT() function is used to add two or more strings.
  1. There may be one or more arguments.
  2. Returns the string that results from concatenating the arguments.
  3. Returns a nonbinary string, if all arguments are nonbinary strings.
  4. Returns a binary string, if the arguments include any binary strings.


The NOT NULL constraint is a column constraint that ensures values stored in a column are not NULL . A column may contain only one NOT NULL constraint which specifies a rule that the column must not contain any NULL value. In other words, if you update or insert NULL into a NOT NULL column, MySQL will issue an error.

Is null in C#?

C# | IsNullOrEmpty() Method

In C#, IsNullOrEmpty() is a string method. It is used to check whether the specified string is null or an Empty string. A string will be null if it has not been assigned a value. A string will be empty if it is assigned “” or String.

How does NVL work in SQL?

NVL(expr1, expr2) : In SQL, NVL() converts a null value to an actual value. Data types that can be used are date, character and number. If the first expression is null, then the third expression is returned i.e. If expr1 is not null, NVL2 returns expr2. If expr1 is null, NVL2 returns expr3.


The IS NOT NULL condition is used in SQL to test for a nonNULL value. It returns TRUE if a nonNULL value is found, otherwise it returns FALSE. It can be used in a SELECT, INSERT, UPDATE, or DELETE statement.

Is null in PHP?

PHP: is_null() function

The is_null () function is used to test whether a variable is NULL or not. *Mixed: Mixed indicates that a parameter may accept multiple (but not necessarily all) types. Return value: Returns TRUE if var_name is null, FALSE otherwise.

Is blank Excel?

Use the ISBLANK function to test if a cell is empty or not. For example, =ISBLANK(A1) will return TRUE if A1 is empty, and FALSE if A1 contains text a formula (even if the formula returns an empty string “”).

How do I replace Null with 0 in SQL?

When you want to replace a possibly null column with something else, use IsNull. This will put a 0 in myColumn if it is null in the first place. Comparing COALESCE() and ISNULL(): The ISNULL function and the COALESCE expression have a similar purpose but can behave differently.

Is null or coalesce?

The ISNULL return value is always considered NOT NULLable (assuming the return value is a non-nullable one) whereas COALESCE with non-null parameters is considered to be NULL. So the expressions ISNULL(NULL, 1) and COALESCE(NULL, 1) although equivalent have different nullability values.