SQL Server date vs smalldatetime

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I have a bunch of tables which consolidate data on different levels: quarterly, hourly, daily and monthly. Apart from that there's a base table which contains the "raw" data as well, this one contains some extra columns. The consolidated tables all have the same columns.

The base, quarterly and hourly tables make use of a column of type smalldatetime to timestamp the data. This column will also be available in the hourly and daily tables, but of course I won't need the time aspect here.

For the sake of simplicity I want to use the smalldatetime data type here also, but maybe it's better for performance to use a date data type for the column?

Is there a really big difference between the types when it comes down to performance?


It's usually a good idea to use the smallest data type that you need. You shouldn't use varchar(max) or even varchar(10) to store a 2 character state abbreviation.

In the same sense, if you just need the Date (e.g. 4/11/2001) then use the Date type and not the DateTime type.

While it might not be a huge gain in performance (DateTime is 5 bytes larger than Date.)It can start adding up if you have multiple fields and/or multiple rows.

SQL Server date vs smalldatetime, the main differences between the datetime2 and smalldatetime data types in SQL Server. Both data types are used for storing date and time. Tag Archives: DATETIME Vs SMALLDATETIME. Difference between SMALLDATETIME and DATETIME Data Types in Sql Server. October 10, 2016. Both SMALLDATETIME and DATETIME Data Types in Sql Server are used for storing Date and Time values in Sql Server. Below table summarizes some of the major difference between these two Data Types.


Various data types have various size which affects size of data/indexes, which is more important than query performance (I/O cost).

On the other hand converting between data types could be costly. Moreover implicit conversion between various data types can be wrong/unexpected.

I would keep one type of date (4 bytes smalldatetime in this case) if you JOIN between tables on date columns or if not keep the smallest possible date type -- smalldatetime for storing hours and quarters and date for pure dates.

datetime2 vs smalldatetime in SQL Server: What's the Difference , Ispirer SQLWays Database Migration Software. date, datetime, smalldatetime, time and timestamp. Date and time data types for representing date and time of  Well my question will eventually be the same then: datetime vs date – Gerrie Schenck Apr 11 '11 at 13:50 3 @dportas: smalldatetime is not deprecated: it's a standard type in ANSI too. – gbn Apr 11 '11 at 14:37


Unfortunately in the case of smalldatetime, it has for me caused trouble when using bcp (bulk copy) utility for export/import operations. BCP import appears to not like smalldatetime fields (at least as they are exported by BCP). Version as late as SQL Server 2008 and using "native" format in bcp. Therefore I will be using datetime for my work in the future because I like being able to use bcp for moving data around.

smalldatetime (Transact-SQL), Both SMALLDATETIME and DATETIME Data Types in Sql Server are used for storing Date and Time values in Sql Server. Below table summarizes some of the​  Difference between SMALLDATETIME and DATETIME Data Types in Sql Server. October 10, 2016. Both SMALLDATETIME and DATETIME Data Types in Sql Server are used for storing Date and Time values in Sql Server. Below table summarizes some of the major difference between these two Data Types.


Range

SmallDateTime: 1 - jan - 1900 to 6 - jun - 2079 DateTime : 1 - jan -1753 to 31 - Dec - 9999

Precision

SmallDateTime: Minute DateTime : Three hundredth of a second(3.33)

Storage

SmallDateTime: 4 Bytes DateTime : 8 bytes

date, datetime, smalldatetime, time and timestamp, SMALLDATETIME Vs DATETIMEBasavaraj Biradar. Both SMALLDATETIME and DATETIME Data Types in Sql Server are used for storing Date and Time values in Sql Server. [ALSO READ] DateTime vs DateTime2  This article explores the main differences between the datetime2 and smalldatetime data types in SQL Server.. Both data types are used for storing date and time values, however, there are some important differences between the two.


check this, too:

when you have to convert from varchar(max) into a datetime:

declare @s varchar(max)
set @s = '2018-06-01 00:00:01'
select CONVERT(smalldatetime, @s )
select CONVERT(datetime,@s )

results into this

2018-06-01 00:00:00
2018-06-01 00:00:01.000

this one second past midnight vanished when converted to smalldatetime

DATETIME Vs SMALLDATETIME, Prior to SQL Server 2008, SQL Server had two types of data to handle date and time, namely SMALLDATETIME and DATETIME. In this article, we will learn the  In this article, we will learn the difference between the SMALLDATETIME and DATETIME and also will find out what data type is better. SQL Server SMALLDATETIME. SMALLDATETIME represents a date that is coupled with a day time. The day in SMALLDATETIME consists of 24 hours. The data type is represented as smalldatetime.


Difference between SMALLDATETIME and DATETIME Data Types , Understanding date/time data types in SQL Server can be difficult, especially when you add TIMESTAMP into the mix. In this tip, you'll learn how data is stored​  smalldatetime (Transact-SQL) 07/22/2017; 4 minutes to read +1; In this article. APPLIES TO: SQL Server Azure SQL Database Azure Synapse Analytics (SQL DW) Parallel Data Warehouse . Defines a date that is combined with a time of day. The time is based on a 24-hour day, with seconds always zero (:00) and without fractional seconds.


SQL Server SMALLDATETIME vs DATETIME vs DATETIME2, While working on the first article about dates Dates In SQL Server: Managing & Manipulating Dates, I touched on the datatypes and realised  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 2019 (15.x) derives the date and time values through use of the GetSystemTimeAsFileTime() Windows API.


Basics for working with DATETIME and SMALLDATETIME in SQL , But in SQL Server 2008 and higher you have alternatives to DateTime and they are all better than the original. DATETIME stores a date and time, it takes 8 bytes to store, and has a precision of .001 seconds. In SQL Server 2008 you can use DATETIME2, it stores a date and time, takes 6-8 bytes to store and has a precision of 100 nanoseconds. So