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mysql - storing numbers as varchar - Stack Overflow You will not be able to do calculations with columns declared as varchar, so numeric types should be used And since your SQL query is a string anyway, MySQL does all the conversion for you (that doesn't mean that you don't need to validate user provided values, of course)
Convert INT to VARCHAR SQL - GeeksforGeeks One common transformation task is converting integer (INT) values to strings (VARCHAR) in SQL INT: An acronym for "integer " It is a numeric data type used to store whole numbers
SQL VARCHAR Data Type Do’s and Don’ts for Faster Databases VARCHAR is a string or character data type of varying size You can store letters, numbers, and symbols with it Starting with SQL Server 2019, you can use the full range of Unicode characters when using a collation with UTF-8 support You can declare VARCHAR columns or variables using VARCHAR [ (n)], where n stands for the string size in bytes
Numeric strings: VARCHAR fields holding numbers Using numeric strings is generally troublesome: most importantly it causes performance problems due to the implicit conversion and also introduces a risk of running into conversion errors due to invalid numbers
Can we use Varchar for columns that will save only numbers Telephone numbers are probably best stored as strings They are typically of fixed length and you will never want to perform numerical operations on them (addition, subtraction etc)
VARCHAR – SQL Tutorial It’s important to note that VARCHAR is not suitable for storing binary data, such as images or executable code In addition to specifying the maximum length of the VARCHAR column, it’s also possible to set a minimum length using the optional keyword CHECK