![]() In this example, the variable is a string representing a date in the ‘YYYY-MM-DD’ format. Here’s an example of using CAST to convert a string to a DATE in SQL Server: DECLARE NVARCHAR(10) = '' The CAST function allows you to explicitly specify the target data type and perform the conversion. When dealing with dates, it’s common to use the CAST function to convert a string or another compatible data type to the DATE data type. In this tutorial, you have learned how to use the SQL Server CAST() function to convert a value from one type to another.In SQL Server, the CAST function is used to convert one data type to another. INNER JOIN sales.order_items i ON o.order_id = i.order_id SELECTĬAST(SUM(quantity * list_price * ( 1 - discount)) AS INT) amount The following statement uses the CAST() function to convert the monthly sales in 2017 to integer values. We will use the sales.orders and sales.order_items tables from the sample database for the demonstration: (1 row affected) Code language: CSS ( css ) D) Using CAST() function with arithmetic operators This example uses the CAST() function to convert the string '' to a datetime: SELECTĬAST( '' AS DATETIME) result Code language: PHP ( php ) When you convert a value of the data types in different places, SQL Server will return a truncated result or a rounded value based on the following rules: From Data TypeĬ) Using the CAST() function to convert a string to a datetime value example 95 AS DEC(3,0)) result Code language: CSS ( css ) ![]() The following example uses the CAST() function to convert the decimal number 5.95 to another decimal number with the zero scale: SELECT CAST(5. (1 row affected) B) Using the CAST() function to convert a decimal to another decimal with different length 95 AS INT) result Code language: CSS ( css ) This example uses the CAST() function to convert the decimal number 5.95 to an integer: SELECT CAST(5. A) Using the CAST() function to convert a decimal to an integer example Let’s take some examples of using the CAST() function. The CAST() function returns the expression converted to the target data type. length is an optional integer that specifies the length of the target type.Note that it cannot be an alias data type. target_type is the target data type to which you want to convert the expression.expression can be a literal value or a valid expression of any type that will be converted.The syntax of the CAST() function is as follows: CAST ( expression AS target_type ) Code language: CSS ( css ) In contrast to implicit conversions, we have explicit conversions where you call the CAST() function to explicitly convert a value of one type to another: SELECT 1 + CAST( 1 AS INT) result Code language: PHP ( php ) This is known as an implicit conversion in SQL Server. When you use two values with different data types, SQL Server will try to convert the lower data type to the higher one before it can process the calculation. In this statement, SQL Server implicitly converts the character string '1' to the number 1. ![]() Let’s see the following query: SELECT 1 + '1' AS result Code language: PHP ( php ) Introduction to SQL Server CAST() function Summary: in this tutorial, you will learn how to use the SQL Server CAST() function to convert a value or an expression from one type to another.
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