Flash cards
Review the key moves
1/4
Core idea
What is the main idea behind SQL EXISTS Keyword?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
1Quick choice
Which statement best captures the main point of this lesson?
2Fill blank
Complete the missing token from the example code.
___ SupplierName3Order
Put the learning moves in the order that makes the concept easiest to apply.
The following SQL lists the suppliers with a product price equal to 22:
The following SQL lists the suppliers with a product price less than 20:
The EXISTS command tests for the existence of any record in a subquery, and returns true if the subquery returns one or more records.
Exists
The EXISTS command tests for the existence of any record in a subquery, and returns true if the subquery returns one or more records.
The following SQL lists the suppliers with a product price less than 20:
Example
SELECT SupplierName
FROM Suppliers
WHERE EXISTS (SELECT ProductName FROM
Products WHERE SupplierId = Suppliers.supplierId AND Price < 20);The following SQL lists the suppliers with a product price equal to 22:
Example
SELECT SupplierName
FROM Suppliers
WHERE EXISTS (SELECT ProductName FROM
Products WHERE SupplierId = Suppliers.supplierId AND Price = 22);