Download Microsoft® SQL Server® 2014 Express from Official Microsoft Download Center



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Run SQL Server on your favorite platform. Yes, install Microsoft Download Manager recommended No, thanks. What happens if I don't install a download manager? Why should I install the Microsoft Download Manager? You may not be able to download multiple files at the same time. In this case, you will have to download the files individually. You would have the opportunity to download individual files on the "Thank you for downloading" page after completing your download.

Files larger than 1 GB may take much longer to download and might not download correctly. You might not be able to pause the active downloads or resume downloads that have failed. There are multiple files available for this download.

Once you click on the "Download" button, you will be prompted to select the files you need. System Requirements Supported Operating System. Z indicates time zone UTC When converting smalldatetime to character data, the styles that include seconds or milliseconds show zeros in these positions. When converting from datetime or smalldatetime values, use an appropriate char or varchar data type length to truncate unwanted date parts.

When converting character data to datetimeoffset , using a style that includes a time, a time zone offset is appended to the result. For a float or real expression , style can have one of the values shown in the following table. For a money or smallmoney expression , style can have one of the values shown in the following table.

For an xml expression , style can have one of the values shown in the following table. For a binary n , char n , varbinary n , or varchar n expression , style can have one of the values shown in the following table. Style values not listed in the table will return an error. The following illustration shows all explicit and implicit data type conversions allowed for SQL Server system-supplied data types.

When you convert between datetimeoffset and the character types char , nchar , nvarchar , and varchar , the converted time zone offset part should always have double digits for both HH and MM. Because Unicode data always uses an even number of bytes, use caution when you convert binary or varbinary to or from Unicode supported data types.

For example, the following conversion does not return a hexadecimal value of It returns a hexadecimal value of Large-value data types have the same implicit and explicit conversion behavior as their smaller counterparts - specifically, the nvarchar , varbinary , and varchar data types.

However, consider the following guidelines:. When you explicitly or implicitly cast the xml data type to a string or binary data type, the content of the xml data type is serialized based on a defined set of rules. The text and image data types do not support automatic data type conversion. You can explicitly convert text data to character data, and image data to binary or varbinary , but the maximum length is bytes. If you try an incorrect conversion, for example trying to convert a character expression that includes letters to an int , SQL Server returns an error message.

If the input is not a character string, the output has the default collation of the database, and a collation label of coercible-default. When converting character or binary expressions binary , char , nchar , nvarchar , varbinary , or varchar to an expression of a different data type, the conversion operation could truncate the output data, only partially display the output data, or return an error. These cases will occur if the result is too short to display.

Conversions to binary , char , nchar , nvarchar , varbinary , or varchar are truncated, except for the conversions shown in the following table. SQL Server guarantees that only roundtrip conversions, in other words conversions that convert a data type from its original data type and back again, yield the same values from version to version. The following example shows such a roundtrip conversion:. Do not construct binary values, and then convert them to a data type of the numeric data type category.

SQL Server does not guarantee that the result of a decimal or numeric data type conversion, to binary , will be the same between versions of SQL Server. When you convert data types that differ in decimal places, SQL Server will sometimes return a truncated result value, and at other times it will return a rounded value.

This table shows the behavior. For example, the values When converting data types where the target data type has fewer decimal places than the source data type, the value is rounded.

SQL Server returns an error message when converting nonnumeric char , nchar , nvarchar , or varchar data to decimal , float , int , numeric. SQL Server also returns an error when an empty string " " is converted to numeric or decimal.