SQL COUNT
Example Data Table : Orders (All of the below examples use this table as datasource)
| Keyid | OrderNo | CustomerName | SalePrice | Quantity | OrderDate |
|---|---|---|---|---|---|
| 1 | 20101213095 | John | 3500 | 10 | 2010-12-13 |
| 2 | 20100620135 | Jimmy | 2509 | 22 | 2010-06-20 |
| 3 | 20100620392 | Vincent | 7200 | 5 | 2010-06-20 |
| 4 | 20100530006 | Tyler | 9200 | 50 | 2010-05-30 |
| 5 | 20100515129 | Alan | 100 | 50 | 2010-05-29 |
| 6 | 20100509059 | John | 2000 | 15 | 2010-05-09 |
| 7 | 20100503088 | Alan | 2200 | 17 | 2010-05-03 |
Example
To count how many rows
Sytax : SELECT COUNT(column_name or *) FROM table_name
SELECT COUNT(*) FROM Orders
will output
| Count(*) |
|---|
| 7 |
SQL
SELECT COUNT(Quantity) AS qtn FROM Orders WHERE Quantity = 50
will output
| qtn |
|---|
| 2 |