How to select only date or time part from DateTime in SQL Server

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Then you have to use this method. On 18,000,000 rows this is what I've found SQL Server 2008 : Method b is about 24% slower than method a.

Views and expressions that reference this column cannot be indexed. Null; } I, personally, almost always use for this if dealing with SQL Server 2005 or lower version , however, it should be noted that there are specific drawbacks to using UDF's, especially if applying them to WHERE clauses see below and the comments on this answer for further details.

Get the Current SQL Server Date and Time

Date and Time functions The following tables list the Transact-SQL date and time functions. See for more information about determinism. Function That Return System Date and Time Values Transact-SQL derives all system date and time values from the operating system of the computer on which the instance of SQL Server runs. Higher-Precision System Date and Time Functions SQL Server 2017 derives the date and time values through use of the GetSystemTimeAsFileTime Windows API. The accuracy depends on the computer hardware and version of Windows on which the instance of SQL Server running. This API has a precision fixed at 100 nanoseconds. Use the GetSystemTimeAdjustment Windows API to determine the accuracy. Function Syntax Return value Return data type Determinism SYSDATETIME Returns a datetime2 7 value containing the date and time of the computer on which the instance of SQL Server runs. The returned value does not include the time zone offset. The returned value includes the time zone offset. The function returns the date and time values as UTC time Coordinated Universal Time. The returned value does not include the time zone offset. The returned value does not include the time zone offset. The function returns the date and time values as UTC time Coordinated Universal Time. Not applicable Not applicable LANGUAGE Returns the name of the language in current used. LANGUAGE is not a date or time function. However, the language setting can affect the output of date functions. SET LANGUAGE is not a date or time function. However, the language setting affects the output of date functions. However, the language setting affects the output of date functions. Not applicable Not applicable Functions That Validate Date and Time Values Function Syntax Return value Return data type Determinism ISDATE expression Determines whether a datetime or smalldatetime input expression has a valid date or time value. Date and time-related topics Topic Description Provides information about the conversion of date and time values to and from string literals, and other date and time formats. Provides guidelines for portability of databases and database applications that use Transact-SQL statements from one language to another, or that support multiple languages. Provides information about ODBC scalar functions available for use in Transact-SQL statements. This includes ODBC date and time functions. Provides time zone conversion.

Each clock-tick is equivalent to 3. The file of fractional seconds comes at a price for the datetime data type however. Which method provides the best performance when removing the time portion from a datetime field in SQL Server. There is a downside to the UDF approach, they're not SARGable. UPDATE: It's SQL Server 2005. And for the north, the fastest way at least in SQL 2008, barring converts to the Date data type is not this method but Convert datetime, Convert int, dateParam - 0. UDFs are definitely not SARGable, but neither is Dateadd nor is Convert to float. The main reason for this is that using a UDF in a WHERE clause renders that clause aswhich means that SQL Server can no longer use an index with that clause in order to improve the speed of query execution. Retrieving the Local Date and Time A common task in SQL Server is the retrieval of the local date and time from the server. Some UDF functions as suggested can be useful, but UDFs can be slow with larger result sets. However often you need the current date at midnight so you can then do some further date manipulation. Quick Video on the same civil Here is the video discussing the same concepts.