Это правильный синтаксис.
CREATE SCHEMA vehicle
GO
CREATE TABLE vehicle.sales
(AccountNum VARCHAR(5) NULL,
DealBookDate DATETIME NULL)
INSERT INTO vehicle.sales (AccountNum, DealBookDate) VALUES('R1', '2018-09-18')
INSERT INTO vehicle.sales (AccountNum, DealBookDate) VALUES('R2', '2018-09-18')
INSERT INTO vehicle.sales (AccountNum, DealBookDate) VALUES('R3', '2018-09-18')
INSERT INTO vehicle.sales (AccountNum, DealBookDate) VALUES('R4', '2018-09-18')
INSERT INTO vehicle.sales (AccountNum, DealBookDate) VALUES('R5', '2018-09-18')
INSERT INTO vehicle.sales (AccountNum, DealBookDate) VALUES('R6', '2018-09-18')
INSERT INTO vehicle.sales (AccountNum, DealBookDate) VALUES('R7', '2018-09-18')
INSERT INTO vehicle.sales (AccountNum, DealBookDate) VALUES('R8', '2018-09-18')
INSERT INTO vehicle.sales (AccountNum, DealBookDate) VALUES('R9', '2018-09-18')
INSERT INTO vehicle.sales (AccountNum, DealBookDate) VALUES('R10', '2018-09-18')
INSERT INTO vehicle.sales (AccountNum, DealBookDate) VALUES('R11', '2018-09-18')
INSERT INTO vehicle.sales (AccountNum, DealBookDate) VALUES('R12', '2018-09-18')
INSERT INTO vehicle.sales (AccountNum, DealBookDate) VALUES('R13', '2018-09-18')
INSERT INTO vehicle.sales (AccountNum, DealBookDate) VALUES('R14', '2018-09-18')
INSERT INTO vehicle.sales (AccountNum, DealBookDate) VALUES('R15', '2018-09-18')
SELECT AccountNum
, MONTH(MAX(DealBookDate)) AS mth
, YEAR(MAX(DealBookDate)) AS yr
, DealBookDate
FROM vehicle.sales
WHERE accountnum IN
('R1', 'R2', 'R3', 'R4', 'R5', 'R6', 'R7', 'R8', 'R9', 'R10', 'R11','R12', 'R13', 'R14', 'R15')
GROUP BY AccountNum, DealBookDate
SELECT R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15,
mth, yr
FROM
(
SELECT AccountNum
, MONTH(MAX(DealBookDate)) AS mth
, YEAR(MAX(DealBookDate)) AS yr
, DealBookDate
FROM vehicle.sales
WHERE accountnum IN
('R1', 'R2', 'R3', 'R4', 'R5', 'R6', 'R7', 'R8', 'R9', 'R10', 'R11','R12', 'R13', 'R14', 'R15')
GROUP BY AccountNum, DealBookDate
) AS SourceTable
PIVOT
(
COUNT(DealBookDate)
FOR AccountNum
IN (R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15)
)
AS PivotTable;
DROP TABLE vehicle.sales
GO
DROP SCHEMA vehicle
GO