SQL WHERE EXISTS Statement

The SQL EXISTS syntax

The general syntax is:

  1. SELECT columnnames
  2. FROM tablename
  3. WHERE EXISTS
  4. (SELECT columnname
  5. FROM tablename
  6. WHERE condition)

 


 

SQL EXISTS Example

Problem: Find suppliers with products over $100.

  1. SELECT CompanyName
  2. FROM Supplier
  3. WHERE EXISTS
  4. (SELECT ProductName
  5. FROM Product
  6. WHERE SupplierId = Supplier.Id
  7. AND UnitPrice > 100)

This is a correlated subquery because the subquery references the enclosing query (with Supplier.Id).
Results: 2 records

CompanyName
Plutzer Lebensmittelgroßmärkte AG
Aux joyeux ecclésiastiques

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