SQL Server date comparisons based on month and year only

Question

I am having trouble determining the best way to compare dates in SQL based on month and year only.

We do calculations based on dates and since billing occurs on a monthl

Answer 1

To handle inequalities, such as between, I like to convert date/times to a YYYYMM representation, either as a string or an integer. For this example:

DECLARE @date1 DATETIME = CAST('6/14/2014' AS DATETIME),
        @date2 DATETIME = CAST('6/15/2014' AS DATETIME),
        @date3 DATETIME = CAST('7/1/2014' AS DATETIME);

SELECT * FROM tableName WHERE @date2 BETWEEN @date1 AND @date3;

I would write the query as:

SELECT *
FROM tableName
WHERE year(@date2) * 100 + month(@date2) BETWEEN year(@date1) * 100 + month(@date1) AND
                                                 year(@date3) * 100 + month(@date1);