Applies To: SQL Server 2014, SQL Server 2016 Preview
Returns the left part of a character string with the specified number of characters.
Applies to: SQL Server (SQL Server 2008 through current version), Azure SQL Database, Azure SQL Data Warehouse Public Preview.
Is an expression of character or binary data. character_expression can be a constant, variable, or column. character_expression can be of any data type, except text or ntext, that can be implicitly converted to varchar or nvarchar. Otherwise, use the CAST function to explicitly convert character_expression.
Is a positive integer that specifies how many characters of the character_expression will be returned. If integer_expression is negative, an error is returned. If integer_expression is type bigint and contains a large value, character_expression must be of a large data type such as varchar(max).
The integer_expression parameter counts a UTF-16 surrogate character as one character.
Returns varchar when character_expression is a non-Unicode character data type.
Returns nvarchar when character_expression is a Unicode character data type.
When using SC collations, the integer_expression parameter counts a UTF-16 surrogate pair as one character. For more information, see Collation and Unicode Support.
The following example returns the five leftmost characters of each product name in the Product table of the AdventureWorks2012 database.
SELECT LEFT(Name, 5) FROM Production.Product ORDER BY ProductID; GO