--- title: "SUBSTRING (Transact-SQL)" description: "Transact-SQL reference for the SUBSTRING function. This function returns a portion of a specified character, binary, text, or image expression." author: MikeRayMSFT ms.author: mikeray ms.date: "10/21/2016" ms.service: sql ms.subservice: t-sql ms.topic: reference f1_keywords: - "SUBSTRING" - "SUBSTRING_TSQL" helpviewer_keywords: - "portion of expression returned [SQL Server]" - "part of expression returned [SQL Server]" - "SUBSTRING function" - "offsets [SQL Server]" - "binary [SQL Server], returning part of" - "expressions [SQL Server], part returned" - "characters [SQL Server], returning part of" dev_langs: - "TSQL" monikerRange: ">= aps-pdw-2016 || = azuresqldb-current || = azure-sqldw-latest || >= sql-server-2016 || >= sql-server-linux-2017 || = azuresqldb-mi-current||=fabric" --- # SUBSTRING (Transact-SQL) [!INCLUDE [sql-asdb-asdbmi-asa-pdw-fabricse-fabricdw](../../includes/applies-to-version/sql-asdb-asdbmi-asa-pdw-fabricse-fabricdw.md)] Returns part of a character, binary, text, or image expression in [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)]. :::image type="icon" source="../../includes/media/topic-link-icon.svg" border="false"::: [Transact-SQL syntax conventions](../../t-sql/language-elements/transact-sql-syntax-conventions-transact-sql.md) ## Syntax ```syntaxsql SUBSTRING ( expression, start, length ) ``` [!INCLUDE[sql-server-tsql-previous-offline-documentation](../../includes/sql-server-tsql-previous-offline-documentation.md)] ## Arguments *expression* Is a **character**, **binary**, **text**, **ntext**, or **image** [expression](../../t-sql/language-elements/expressions-transact-sql.md). *start* Is an integer or **bigint** expression that specifies where the returned characters start. (The numbering is 1 based, meaning that the first character in the expression is 1). If *start* is less than 1, the returned expression will begin at the first character that is specified in *expression*. In this case, the number of characters that are returned is the largest value of either the sum of *start* + *length*- 1 or 0. If *start* is greater than the number of characters in the value expression, a zero-length expression is returned. *length* Is a positive integer or **bigint** expression that specifies how many characters of the *expression* will be returned. If *length* is negative, an error is generated and the statement is terminated. If the sum of *start* and *length* is greater than the number of characters in *expression*, the whole value expression beginning at *start* is returned. ## Return Types Returns character data if *expression* is one of the supported character data types. Returns binary data if *expression* is one of the supported **binary** data types. The returned string is the same type as the specified expression with the exceptions shown in the table. |Specified expression|Return type| |--------------------------|-----------------| |**char**/**varchar**/**text**|**varchar**| |**nchar**/**nvarchar**/**ntext**|**nvarchar**| |**binary**/**varbinary**/**image**|**varbinary**| ## Remarks The values for *start* and *length* must be specified in number of characters for **ntext**, **char**, or **varchar** data types and bytes for **text**, **image**, **binary**, or **varbinary** data types. The *expression* must be **varchar(max)** or **varbinary(max)** when the *start* or *length* contains a value larger than 2147483647. ## Supplementary Characters (Surrogate Pairs) When using supplementary character (SC) collations, both *start* and *length* count each surrogate pair in *expression* as a single character. For more information, see [Collation and Unicode Support](../../relational-databases/collations/collation-and-unicode-support.md). ## Examples ### A. Using SUBSTRING with a character string The following example shows how to return only a part of a character string. From the `sys.databases` table, this query returns the system database names in the first column, the first letter of the database in the second column, and the third and fourth characters in the final column. ```sql SELECT name, SUBSTRING(name, 1, 1) AS Initial , SUBSTRING(name, 3, 2) AS ThirdAndFourthCharacters FROM sys.databases WHERE database_id < 5; ``` [!INCLUDE[ssResult](../../includes/ssresult-md.md)] |name |Initial |ThirdAndFourthCharacters| |---|--|--| |master |m |st | |tempdb |t |mp | |model |m |de | |msdb |m |db | Here is how to display the second, third, and fourth characters of the string constant `abcdef`. ```sql SELECT x = SUBSTRING('abcdef', 2, 3); ``` [!INCLUDE[ssResult](../../includes/ssresult-md.md)] ``` x ---------- bcd (1 row(s) affected) ``` ### B. Using SUBSTRING with text, ntext, and image data > [!NOTE] > To run the following examples, you must install the **pubs** database. The following example shows how to return the first 10 characters from each of a **text** and **image** data column in the `pub_info` table of the `pubs` database. **text** data is returned as **varchar**, and **image** data is returned as **varbinary**. ```sql USE pubs; SELECT pub_id, SUBSTRING(logo, 1, 10) AS logo, SUBSTRING(pr_info, 1, 10) AS pr_info FROM pub_info WHERE pub_id = '1756'; ``` [!INCLUDE[ssResult](../../includes/ssresult-md.md)] ``` pub_id logo pr_info ------ ---------------------- ---------- 1756 0x474946383961E3002500 This is sa (1 row(s) affected) ``` The following example shows the effect of SUBSTRING on both **text** and **ntext** data. First, this example creates a new table in the `pubs` database named `npub_info`. Second, the example creates the `pr_info` column in the `npub_info` table from the first 80 characters of the `pub_info.pr_info` column and adds an `ü` as the first character. Lastly, an `INNER JOIN` retrieves all publisher identification numbers and the `SUBSTRING` of both the **text** and **ntext** publisher information columns. ```sql IF EXISTS (SELECT table_name FROM INFORMATION_SCHEMA.TABLES WHERE table_name = 'npub_info') DROP TABLE npub_info; GO -- Create npub_info table in pubs database. Borrowed from instpubs.sql. USE pubs; GO CREATE TABLE npub_info ( pub_id CHAR(4) NOT NULL REFERENCES publishers(pub_id) CONSTRAINT UPKCL_npubinfo PRIMARY KEY CLUSTERED, pr_info ntext NULL ); GO -- Fill the pr_info column in npub_info with international data. RAISERROR('Now at the inserts to pub_info...',0,1); GO INSERT npub_info VALUES('0736', N'üThis is sample text data for New Moon Books, publisher 0736 in the pubs database') ,('0877', N'üThis is sample text data for Binnet & Hardley, publisher 0877 in the pubs databa') ,('1389', N'üThis is sample text data for Algodata Infosystems, publisher 1389 in the pubs da') ,('9952', N'üThis is sample text data for Scootney Books, publisher 9952 in the pubs database') ,('1622', N'üThis is sample text data for Five Lakes Publishing, publisher 1622 in the pubs d') ,('1756', N'üThis is sample text data for Ramona Publishers, publisher 1756 in the pubs datab') ,('9901', N'üThis is sample text data for GGG&G, publisher 9901 in the pubs database. GGG&G i') ,('9999', N'üThis is sample text data for Lucerne Publishing, publisher 9999 in the pubs data'); GO -- Join between npub_info and pub_info on pub_id. SELECT pr.pub_id, SUBSTRING(pr.pr_info, 1, 35) AS pr_info, SUBSTRING(npr.pr_info, 1, 35) AS npr_info FROM pub_info pr INNER JOIN npub_info npr ON pr.pub_id = npr.pub_id ORDER BY pr.pub_id ASC; ``` ## Examples: [!INCLUDE[ssazuresynapse-md](../../includes/ssazuresynapse-md.md)] and [!INCLUDE[ssPDW](../../includes/sspdw-md.md)] ### C. Using SUBSTRING with a character string The following example shows how to return only a part of a character string. From the `dbo.DimEmployee` table, this query returns the last name in one column with only the first initial in the second column. ```sql -- Uses AdventureWorks SELECT LastName, SUBSTRING(FirstName, 1, 1) AS Initial FROM dbo.DimEmployee WHERE LastName LIKE 'Bar%' ORDER BY LastName; ``` [!INCLUDE[ssResult](../../includes/ssresult-md.md)] ``` LastName Initial -------------------- ------- Barbariol A Barber D Barreto de Mattos P ``` The following example shows how to return the second, third, and fourth characters of the string constant `abcdef`. ```sql USE ssawPDW; SELECT TOP 1 SUBSTRING('abcdef', 2, 3) AS x FROM dbo.DimCustomer; ``` [!INCLUDE[ssResult](../../includes/ssresult-md.md)] ``` x ----- bcd ``` ## See Also [LEFT (Transact-SQL)](../../t-sql/functions/left-transact-sql.md) [LTRIM (Transact-SQL)](../../t-sql/functions/ltrim-transact-sql.md) [RIGHT (Transact-SQL)](../../t-sql/functions/right-transact-sql.md) [RTRIM (Transact-SQL)](../../t-sql/functions/rtrim-transact-sql.md) [STRING_SPLIT (Transact-SQL)](../../t-sql/functions/string-split-transact-sql.md) [TRIM (Transact-SQL)](../../t-sql/functions/trim-transact-sql.md) [String Functions (Transact-SQL)](../../t-sql/functions/string-functions-transact-sql.md)