SELECT YEAR(CONVERT(DATE,OrderDATE))'Rok' ,
    (
    SELECT COUNT(CustomerID)
    FROM Sales.SalesOrderHeader
    WHERE MONTH(CONVERT(DATE,OrderDATE))=1 AND YEAR(CONVERT(DATE,OrderDATE)) = YEAR(CONVERT(DATE,res.OrderDate))
    )'1',
    (
    SELECT COUNT(CustomerID)
    FROM Sales.SalesOrderHeader
    WHERE MONTH(CONVERT(DATE,OrderDATE))=2 AND YEAR(CONVERT(DATE,OrderDATE)) = YEAR(CONVERT(DATE,res.OrderDate))
    )'2',
    (
    SELECT COUNT(CustomerID)
    FROM Sales.SalesOrderHeader
    WHERE MONTH(CONVERT(DATE,OrderDATE))=3 AND YEAR(CONVERT(DATE,OrderDATE)) = YEAR(CONVERT(DATE,res.OrderDate))
    )'3',
    (
    SELECT COUNT(CustomerID)
    FROM Sales.SalesOrderHeader
    WHERE MONTH(CONVERT(DATE,OrderDATE))=4 AND YEAR(CONVERT(DATE,OrderDATE)) = YEAR(CONVERT(DATE,res.OrderDate))
    )'4',
    (
    SELECT COUNT(CustomerID)
    FROM Sales.SalesOrderHeader
    WHERE MONTH(CONVERT(DATE,OrderDATE))=5 AND YEAR(CONVERT(DATE,OrderDATE)) = YEAR(CONVERT(DATE,res.OrderDate))
    )'5',
    (
    SELECT COUNT(CustomerID)
    FROM Sales.SalesOrderHeader
    WHERE MONTH(CONVERT(DATE,OrderDATE))=6 AND YEAR(CONVERT(DATE,OrderDATE)) = YEAR(CONVERT(DATE,res.OrderDate))
    )'6',
    (
    SELECT COUNT(CustomerID)
    FROM Sales.SalesOrderHeader
    WHERE MONTH(CONVERT(DATE,OrderDATE))=7 AND YEAR(CONVERT(DATE,OrderDATE)) = YEAR(CONVERT(DATE,res.OrderDate))
    )'7',
    (
    SELECT COUNT(CustomerID)
    FROM Sales.SalesOrderHeader
    WHERE MONTH(CONVERT(DATE,OrderDATE))=8 AND YEAR(CONVERT(DATE,OrderDATE)) = YEAR(CONVERT(DATE,res.OrderDate))
    )'8',
    (
    SELECT COUNT(CustomerID)
    FROM Sales.SalesOrderHeader
    WHERE MONTH(CONVERT(DATE,OrderDATE))=9 AND YEAR(CONVERT(DATE,OrderDATE)) = YEAR(CONVERT(DATE,res.OrderDate))
    )'9',
    (
    SELECT COUNT(CustomerID)
    FROM Sales.SalesOrderHeader
    WHERE MONTH(CONVERT(DATE,OrderDATE))=10 AND YEAR(CONVERT(DATE,OrderDATE)) = YEAR(CONVERT(DATE,res.OrderDate))
    )'10',
    (
    SELECT COUNT(CustomerID)
    FROM Sales.SalesOrderHeader
    WHERE MONTH(CONVERT(DATE,OrderDATE))=11 AND YEAR(CONVERT(DATE,OrderDATE)) = YEAR(CONVERT(DATE,res.OrderDate))
    )'11',
    (
    SELECT COUNT(CustomerID)
    FROM Sales.SalesOrderHeader
    WHERE MONTH(CONVERT(DATE,OrderDATE))=12 AND YEAR(CONVERT(DATE,OrderDATE)) = YEAR(CONVERT(DATE,res.OrderDate))
    )'12'
FROM Sales.SalesOrderHeader res
GROUP BY YEAR(CONVERT(DATE,OrderDATE))
ORDER BY 1