This example uses the CONVERT() function to convert the string '' to a datetime value: SELECT CONVERT(DATETIME, '') result Ĭode language: SQL (Structured Query Language) ( sql ) D) Using the CONVERT() function to convert a datetime value to a string value example C) Using the CONVERT() function to convert a string to a datetime value example Notice that the rounding and truncation behaviors of the CONVERT() function are the same as the CAST() functions’. ![]() This example uses the CONVERT() function to convert the decimal number 9.95 to another decimal number with zero scales: SELECT CAST( 9.95 AS DEC( 2, 0)) result This example uses the CONVERT() function to convert the decimal number 9.95 to an integer: SELECT CONVERT( INT, 9.95) result Ĭode language: SQL (Structured Query Language) ( sql ) B) Using the CONVERT() function to convert a decimal to another decimal with different length example A) Using the CONVERT() function to convert a decimal to an integer example Let’s take some examples of using the CONVERT() function. In contrast, the CAST() function is a part of ANSI-SQL functions, which is widely available in many other database products. The CONVERT() is similar to the CAST() function. The CONVERT() function returns the value of expression translated to the target_type with a specified style. If style is NULL, the CONVERT() function will return NULL. style is an optional integer that determines how the CONVERT() function will translate expression.expression is a valid expression of any type that will be converted.The length is optional and defaults to 30. length is an 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 wan to convert the expression.The following shows the syntax of the CONVERT() function: CONVERT ( target_type, expression )Ĭode language: SQL (Structured Query Language) ( sql ) The CONVERT() function allows you to convert a value of one type to another. Introduction to SQL Server CONVERT() function In this tutorial, you have learned how to use the CAST() and TO_DATE() functions to convert a string to a date in SQL.Summary: in this tutorial, you will learn how to use the SQL Server CONVERT() function to convert a value of one type to another. Notice that the date format must be corresponding to the date string as specified in the statement DD MON YYYYĬheck it out the Oracle TO_DATE() and PostgreSQL TO_DATE() functions for the details. ![]() The following shows the TO_DATE() function syntax: TO_DATE(string, format)įor example, to convert the string '' to a date value, you use the following statement: SELECT TO_DATE( '', 'DD MON YYYY' ) Oracle and PostgreSQL provide the TO_DATE() function that converts a string to date based on a specified format. Here is the result: Code language: SQL (Structured Query Language) ( sql ) Convert string to date using TO_DATE() function Similarly, the following example also converts the string 180101 to January 1st, 2018: SELECT CAST( '180101' AS DATE) ![]() SQL Server converts the string 2018 to January 1st, 2018: The following example shows how to convert a string to a date: SELECT CAST( '2018' AS DATE) In case the function fails to convert, it issues an error, depending on the implementation of a specific database system. The CAST() function returns a DATE value if it successfully converts the string to date. In this syntax, the string can be any DATE value that is convertible to a date. The following illustrates the syntax of the CAST() function: CAST (string AS DATE)Ĭode language: SQL (Structured Query Language) ( sql ) SQL provides a CAST() function that allows you to convert a string to a date. Convert string to date using CAST() function ![]() Summary: in this tutorial, you will learn various functions that convert a string to a date in SQL.
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