The SQL ALL Operator
The ALL operator is used to compare a value to every value returned by a subquery.
The ALL operator evaluates to TRUE if every value in the subquery result-set meet the condition.
The ALL operator is typically used with WHERE and HAVING statements.
ALL Syntax
SELECT column_name(s)
FROM table_name
WHERE
column_name operator ALL (subquery);
Note: The operator must be a standard comparison operator (=, <>, !=, >, >=, <, or <=).
Demo Database
Below is a selection from the "Products" table in the Northwind sample database:
| ProductID | ProductName | Price |
|---|---|---|
| 1 | Chais | 18.00 |
| 2 | Chang | 19.00 |
| 3 | Aniseed Syrup | 10.00 |
| 4 | Chef Anton's Cajun Seasoning | 22.00 |
And a selection from the "OrderDetails" table:
| OrderDetailID | ProductID | Quantity |
|---|---|---|
| 1 | 11 | 12 |
| 2 | 42 | 10 |
| 3 | 72 | 5 |
| 4 | 14 | 9 |
SQL ALL Example
The following SQL returns the ProductName if ALL the records in the "OrderDetails" table has Quantity equal to 10. This will of course return FALSE because the Quantity column has many different values (not only the value of 10):
Example
SELECT ProductName
FROM Products
WHERE ProductID = ALL (
SELECT ProductID
FROM OrderDetails
WHERE Quantity = 10
);
