Як використовувати int і varchar у MySQL?

How to convert INT to VARCHAR in MySQL?

Using the CAST Function FROM your_table; The int_column is an integer that is converted to a VARCHAR datatype using the CAST function. The length of the generated VARCHAR column is specified in (10). You can change this figure according to the length specifications for your data.

What is the difference between INT and VARCHAR?

Varchar is used when the data to be dealt with is a set of characters on which numerical operations cannot be performed directly whereas int is used when certain numerical are to be performed on it. Varchar includes numbers, alphabets as well as special characters whereas int only include numbers.

How to define VARCHAR in MySQL?

In Oracle, the VARCHAR2(n) data type stores variable-length character strings up to n bytes (default) or characters with the maximum of 4000 or 32,767 bytes if MAX_STRING_SIZE initialization parameter is set to EXTENDED (not set by default).

How to add VARCHAR and INT in SQL?

Both the CONVERT() and CAST() functions in SQL can be used to concatenate an INT and a VARCHAR data type. These functions convert the INT to a CHAR (which is a string data type), allowing concatenation of numbers and texts.

There is a simple rule of thumb: If you need to do arithmetic or indexing, use a numeric type, if not use a character type.
If you’re sure that you’ll only store numbers and you’re also sure about the upper limit, go for the correctly sized int (from TINYINT to BIGINT) …
I am build a web application (project management system) and I have been wondering about this when it come to performance. I have an Issues table an inside it …