How Can I Compare Only the Date Portion of DATETIME2 Columns in SQL Server?

Comparing DATETIME and DATE While Ignoring the Time Portion

In SQL Server, comparing two DATETIME2(0) columns that represent dates can be challenging when only the date portion (day, month, year) is of interest. The Time portion (hours, minutes, seconds) can lead to discrepancies in comparisons.

To address this, SQL Server 2008 introduced the CAST function, which allows conversion between different data types. By casting the DATETIME2(0) columns to the DATE data type using the CAST function, the Time portion is effectively discarded, leaving only the date portion for comparison.

The following example demonstrates how to compare two records solely based on their Date portions:

IF CAST(DateField1 AS DATE) = CAST(DateField2 AS DATE)

By casting both DateField1 and DateField2 to the DATE data type, the comparison directly compares only the day, month, and year components, ignoring any differences in time. This ensures that records have identical Date portions, regardless of their Time portions.

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