How can dates in a single column be compared in SQL Server?

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Dates in a single column can be compared in SQL Server by using comparison operators such as greater than (>), less than (<), greater than or equal to (>=) and less than or equal to (<=). You can use the following syntax:

SELECT * FROM tablename WHERE datecolumn > '2021-01-01' AND date_column < '2021-01-31'

This query will select all the rows from the table where the date_column is greater than '2021-01-01' and less than '2021-01-31'. You can also use the BETWEEN operator to select rows within a range of dates:

SELECT * FROM tablename WHERE datecolumn BETWEEN '2021-01-01' AND '2021-01-31'

This query will select all the rows from the table where the date_column is between '2021-01-01' and '2021-01-31'.