In SQL Server, EXIST condition is used in combination with a subquery. It returns at least one row after met the conditions. It can be used in a SELECT, INSERT, UPDATE, or DELETE statement.

Syntax:

```
WHERE EXISTS ( subquery );
```

Parameter explanation

subquery: The subquery is a SELECT statement. If the subquery returns at least one record in its result set, the EXISTS clause will evaluate to TRUE and the EXISTS condition will be met. If the subquery does not return any records, the EXISTS clause will evaluate to FALSE and the EXISTS condition will not be met.

EXISTS condition with SELECT statement

We have two tables: “Employees” and “Employee2”, having the following data:

Employees:

Employee2:

Example:

Use the EXISTS condition on both tables with OR condition:

SELECT * FROM [tecklearn].[dbo].[Employees]
WHERE EXISTS (SELECT *
FROM [tecklearn].[dbo].[Employee2]
WHERE Employees.salary = Employee2.salary
OR Employees.name = Employee2.name);

Output:

Example2:

Use the EXISTS condition on both tables with AND condition:

SELECT *
FROM [tecklearn].[dbo].[Employees]
WHERE EXISTS (SELECT *
FROM [tecklearn].[dbo].[Employee2]
WHERE Employees.salary = Employee2.salary
AND Employees.name = Employee2.name);

Output:

There is nothing common in both table on given parameters.

So, this brings us to the end of blog. This Tecklearn ‘SQL Server EXISTS Conditions’ blog helps you with commonly asked questions if you are looking out for a job in MS-SQL Server. If you wish to learn MS-SQL Server and build a career in Database domain, then check out our interactive, MS-SQL Server Training, that comes with 24*7 support to guide you throughout your learning period. Please find the link for course details:

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Introduction to SQL

Various types of databases
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Overview of Microsoft SQL Server Management Studio
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Introduction to relational databases, basic concepts of relational tables

Working with rows and columns
Various operators used like logical and relational
Constraints, Primary Key and Foreign Key
Insert, Update, Delete, Alter

Working with SQL: Join, Tables, and Variables

SQL Operators and Queries
SQL functions
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What is Rank Function? Triggers, when to execute Triggers?

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Concepts of Concurrency and Locking behaviour
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