Explored six distinct techniques – including the versatile CAST() and CONVERT() functions, the clever + 0 trick, the dual-purpose FORMAT() function, the precision-driven CAST() with REGEXP, and the adaptable CASE statement. DATESUB () Subtract a time value (interval) from a date. ![]() DATEADD () Add time values (intervals) to a date value. This blog explored a comprehensive array of methodologies for seamlessly converting strings to numeric formats, such as Float or Double, within the MySQL database environment. DATE () Extract the date part of a date or datetime expression. The CASE statement allows custom handling of conversions, offering flexibility in scenarios involving complex data. Let's explore this method: SELECT CASE WHEN column_name REGEXP '^+(\.+)?$' THEN CAST(column_name AS FLOAT) ELSE 0 END AS converted_value FROM your_table Method 6: Using CASE Statement for Custom Conversionsįor intricate conversions, a conditional approach using the CASE statement proves valuable. Here, the CAST() function, in conjunction with REGEXP, successfully filters out non-numeric characters, resulting in the desired numeric output. ![]() In cases where the data might contain non-numeric characters, a combination of CAST() and REGEXP can ensure a clean conversion: SELECT CAST('12.34abc' AS DECIMAL(10, 2)) AS converted_value Method 5: Utilizing the CAST() Function with REGEXP The FORMAT() function, besides formatting, can act as a catalyst for string-to-numeric conversion, as evidenced by the output. Let's see this in action: SELECT FORMAT('543.21', 2) AS converted_value The FORMAT() function, primarily used for number formatting, can also trigger an implicit conversion from string to numeric. As far as I can see convert or cast are either not suitable in an insert statement or do not allow to specify the. I did the same with a date using strtodate but I can't find a similar function for numbers. Let's examine this approach: SELECT '98.76' + 0 AS converted_value īy adding zero to the string ' 98.76', MySQL implicitly recognizes the need for conversion, resulting in a floating-point output. I am starting with mysql and want to convert a string like 12.567,98 (dutch format) to a number (decimal format) in an INSERT statement. Method 3: Leveraging the + 0 TrickĪ clever technique involves adding zero to the string, prompting MySQL to implicitly perform the conversion. The CONVERT() function transforms the string ' 67.89' into a Double, demonstrating its utility in numeric type conversions. Consider the following code snippet: SELECT CONVERT('67.89' USING DOUBLE) AS converted_value The CONVERT() function, akin to CAST(), can also be harnessed to achieve string-to-numeric conversion. In this example, the CAST() function explicitly converts the string ' 123.45' into a floating-point number. Observe the following query and its output: SELECT CAST('123.45' AS FLOAT) AS converted_value To transform a string into a floating-point number, the CAST() function is invaluable. The CAST() function is a versatile tool in MySQL that allows you to convert between different data types. We will delve into multiple methods, complemented by code examples and insightful explanations, empowering you to conquer data transformation challenges with finesse. Look at the above output, we have changed varchar to int.This blog aims to provide an in-depth exploration of how to perform such conversions in MySQL. mysql > SELECT CAST ( Value AS UNSIGNED ) FROM VarchartointDemo The CAST() function in MySQL is used to convert a value from one data type to another data type specified in the expression. SELECT CAST ( yourColumnName AS anyDataType ) FROM yourTableName Īpply the above syntax to cast varchar to int. mysql > select * from VarchartointDemo Ĭast varchar to int using the following syntax. Mysql > insert into VarchartointDemo values ( '234' ) Query OK, 1 row affected ( 0.16 sec )ĭisplay all records with the help of select statement. The query is as follows − mysql > insert into VarchartointDemo values ( '123' ) Query OK, 1 row affected ( 0.26 sec ) mysql > create table VarchartointDemo -> ( -> Value varchar ( 100 ) -> ) Query OK, 0 rows affected ( 0.51 sec )Īfter creating a table, let us insert some records into the table with the help of INSERT command. Convert String Number Into A Float Number. cast ( anyValue as dataType )įor our example, we will create a table with the help of CREATE command. ![]() To cast VARCHAR to INT, we can use the cast() function from MySQL.
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