{{}} YugabyteDB supports a number of standard aggregation functions. For example, consider the following products table: | ProductID | ProductName | SupplierID | CategoryID | Unit | Price | Quantity | --- | --- | --- | --- | --- | --- | --- | 1 | Chais | 1 | 1 | 10 boxes x 20 bags | 18 | 25 | 2 | Chang | 1 | 1 | 24 - 12 oz bottles | 19 | 12 | 3 | Aniseed Syrup | 1 | 2 | 12 - 550 ml bottles | 10 | 10 | 4 | Chef Anton's Cajun Seasoning | 2 | 2 | 48 - 6 oz jars | 22 | 9 | 5 | Chef Anton's Gumbo Mix | 2 | 2 | 36 boxes | 21.35 | 40 Let us create this table with `ProductID` as the primary hash key. ```sql ycqlsh> CREATE KEYSPACE store; ``` ```sql ycqlsh> CREATE TABLE store.products (ProductID BIGINT PRIMARY KEY, ProductName VARCHAR, SupplierID INT, CategoryID INT, Unit TEXT, Price FLOAT, Quantity INT); ``` Now populate the sample data. ```sql INSERT INTO store.products (ProductID, ProductName, SupplierID, CategoryID, Unit, Price, Quantity) VALUES (1, 'Chais', 1, 1, '10 boxes x 20 bags', 18, 25); INSERT INTO store.products (ProductID, ProductName, SupplierID, CategoryID, Unit, Price, Quantity) VALUES (2, 'Chang', 1, 1, '24 - 12 oz bottles', 19, 12); INSERT INTO store.products (ProductID, ProductName, SupplierID, CategoryID, Unit, Price, Quantity) VALUES (3, 'Aniseed Syrup', 1, 2, '12 - 550 ml bottles', 10, 10); INSERT INTO store.products (ProductID, ProductName, SupplierID, CategoryID, Unit, Price, Quantity) VALUES (4, 'Chef Anton''s Cajun Seasoning', 2, 2, '48 - 6 oz jars', 22, 9); INSERT INTO store.products (ProductID, ProductName, SupplierID, CategoryID, Unit, Price, Quantity) VALUES (5, 'Chef Anton''s Gumbo Mix', 2, 2, '36 boxes', 21.35, 40); ``` ## Counts - Find the number of item types in the store as follows: ```sql ycqlsh> SELECT COUNT(ProductID) FROM store.products; ``` ```output count(productid) ------------------ 5 (1 rows) ``` - Give an alias name to the count column as follows: ```sql ycqlsh> SELECT COUNT(ProductID) as num_products FROM store.products; ``` ```output num_products -------------- 5 (1 rows) ``` - Find the number of item types for supplier 1 as follows: ```sql ycqlsh> SELECT COUNT(ProductID) as supplier1_num_products FROM store.products WHERE SupplierID=1; ``` ```output supplier1_num_products ------------------------ 3 (1 rows) ``` ## Numeric aggregation functions The standard aggregate functions of `min`, `max`, `sum`, `avg` and `count` are built-in functions. - To find the total number of items in the store, run the following query: ```sql ycqlsh> SELECT SUM(Quantity) FROM store.products; ``` ```output sum(quantity) --------------- 96 (1 rows) ``` - To find the price of the cheapest and the most expensive item, run the following: ```sql ycqlsh> SELECT MIN(Price), MAX(Price) FROM store.products; ``` ```output min(price) | max(price) ------------+------------ 10 | 22 (1 rows) ``` - To find the average price of all the items in the store, run the following: ```sql ycqlsh> SELECT AVG(price) FROM store.products; ``` ```output system.avg(price) ------------------- 18.07 (1 rows) ```