Differences between NOT IN and NOT EXISTS, Operators
In this, we are going to list the difference between these two operators i.e. NOT IN and NOT EXISTS.
SL No. |
NOT IN Operator |
NOT EXISTS Operator |
---|---|---|
1. |
NOT IN operator is used to search data from a finite list of values or a subquery. |
NOT EXISTS operator is used to evaluate a subquery and return returns true if the specified row is absent. |
2. |
NULL values creates problem in execution. |
NULL values are not an exception here. It can easily compare with NULL values. |
3. |
It is considered less efficient for large data sets as it will search whole data set before returning any boolean value. |
It is more efficient for large dataset. It stops execution when it finds the first matching row. |
4. |
Checks for existence of a values from a finite list. It return true if the matched values is not present in the given list. |
Checks presence of an subquery. It returns true if the specified subquery return false. |
5. |
Negation of IN operator. |
Negation of EXISTS operator. |
6. |
Syntax: WHERE column NOT IN ( list of values) |
Syntax: WHERE EXISTS (subquery); |
NOT IN vs NOT EXISTS in SQL
Structured Query Language (SQL) is a domain-specific language used in managing and manipulating data in a relational database. In SQL, we use these two operators i.e. NOT IN and NOT EXISTS to filter out and efficiently retrieve our data from a table.
Both of these operators are negations of IN and EXISTS operators respectively. In short, they perform exact opposite types of operations compared to IN and EXISTS operators.
In this article, we are going to compare NOT IN and NOT EXISTS operators. We are going to discuss their syntax, working, and differences between them. We will also see examples related to them.