Pomocí CONVERT() v klauzuli WHERE převést varchar na datum

Musíte convert a Cast Date a poté jej použijte v BETWEEN doložka. Zkuste toto.

SELECT Con_Consult_Date
FROM Consultation
WHEREE CAST(CONVERT(CHAR(10), CONVERT(DATETIME, Con_Consult_Date, 105), 101) AS DATE) 
BETWEEN CAST(CONVERT(CHAR(10), CONVERT(DATETIME, '01-01-2013', 105), 101) AS DATE) 
AND CAST(CONVERT(CHAR(10), CONVERT(DATETIME, '31-12-2013', 105), 101) AS DATE)
GO