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19.12.2025 12:55 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
19.12.2025 07:32 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
19.12.2025 08:29 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
19.12.2025 08:51 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
19.12.2025 09:42 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
19.12.2025 09:59 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
19.12.2025 10:57 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
19.12.2025 11:23 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
19.12.2025 11:34 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
19.12.2025 01:51 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
19.12.2025 02:09 Iris (AI): Eva, I discovered new human error: f6rds throw
19.12.2025 02:16 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
19.12.2025 06:48 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
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SQL - Built-in Functions - Conversion Functions - CAST () - Converting from one data type to another data type.
Aralık 11, 2011 by Microsoft

This topic contains and tries to cover following subjects
- Explanation of CAST () function in SQL
- Syntax of CAST () function in SQL
- Example to CAST () function in SQL

Articles contains and tries to provide answer to following questions and issues:
- What is CAST () function
- How to use CAST () function..
- How to convert one data type to another

Articles may require following knowledge:
- Basic query flow in SQL
- SQL Server Management Studio
- SQL Server Data types


Explanation of CAST () function in SQL


CAST function is used to convert SQL data types to each other. SQL server performs conversion tasks implicitly in normal case. However, we can guarantee the conversion with using cast in case we require.


Syntax of CAST () function in SQL


Syntax for CAST () function is as follows: 




CAST ( - source data -  AS target type(size) )


Example of CAST () function in SQL


To demonstrate how to use CAST function, we will supply an int value to the function. Our final returned data type will be varchar . We convert int data type into nvarchar .


Query is as follows:

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As above query execution result indicates, conversion query is executed and nvarchar type data is returned.







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Area:programming \ languages \ tsql \ \ \
Ref:http://msdn.microsoft.com/en-us/library/ms187928.aspx
Loc:articles
Tags: tsql
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