![]() The GETDATE() function will be used to retrieve the current data and time. This example illustrates how to convert the current database system date and time into several formats. For demo purposes, we are going to convert the following data types:Įxample #1: Convert date and time data types The next step is to describe how the SQL CONVERT function works. Note: The table has been taken from the official Microsoft documentation. In the Microsoft documentation, you can find the table that illustrates data type conversions to be done implicitly or explicitly. In the second query, the function has converted the decimal data type of the Price column into an integer data type as specified in the query. the second query with the explicitly specified CONVERT function ![]() Let’s check this in the following SQL queries. It means that you need to explicitly specify the CONVERT keyword in your query. It means that SQL Server has automatically converted ‘1000’ as text from the second query into the integer data type.Įxplicit conversion takes place when data is converted from one data type to another manually. the first queryĪs you can see, both queries have the same output. Let’s compare the results of these two SQL queries. In this case, you do not need to explicitly specify the CONVERT keyword in the query. Implicit conversion occurs when data is converted from one data type to another automatically. Implicit and explicit data type conversionĭata types can be converted either implicitly or explicitly. For more information about style values, see the Microsoft documentation. The specified data type defines the range of values for the style argument. ArgumentĪ data type you want to get in the result.Īn integer that specifies the length of the destination data type.Īn integer expression that instructs how the function will convert the expression. The table describes the arguments used in the CONVERT function. The syntax of the function is as follows: CONVERT ( data_type, expression ) Now, let’s start with the syntax of the CONVERT function and have a detailed look at each argument. To move on, we’ll see how to use the SQL CONVERT function and discuss syntax, examples, and alternatives to the function. However, in late SQL Server versions such as 2016, the function returns NULL if the third parameter is null. ![]() In earlier SQL Server versions such as 2005, 2008, and 2012, the CONVERT function returned a data type specified in the expression and returned NULL when a given data type argument was null. The function returns the converted value, if the conversion succeeds, or returns an error if it fails.ĭepending on the SQL Server version you use, the CONVERT function works differently. SQL CONVERT explicitly converts an expression of one data type to another with formatting. What is a CONVERT function in SQL Server? Use the CONVERT function in the WHERE clause.Example #1: Convert date and time data types.Implicit and explicit data type conversion.What is a CONVERT function in SQL Server?.In the article, you will learn how to use the CONVERT() function in SQL Server with syntax and examples, as well as discuss the alternatives that exist to that function. This will allow users to access, view, or modify data when required. It is an efficient way to manage and organize data into different data types so that they can be synchronized on multiple platforms. When working with databases, data conversion is an important aspect.
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