How to concat datatypes like integers(integer with integer) & varchar(varchar with varchar) in mysql?

Question

How can we concat

1. integers with integers
2. varchar with varchar
3. int with varchar

in MySQL ?

Answer 1

Use CONCAT

http://dev.mysql.com/doc/refman/5.1/en/string-functions.html#function_concat

SELECT CONCAT(1, 2);
-- "12"

SELECT CONCAT('foo', 'bar');
-- "foobar"

SELECT CONCAT(1, 'bar');
-- "1bar"

Answer 2

if the arguments include any binary strings, the result is a binary string. A numeric argument is converted to its equivalent binary string form; if you want to avoid that, you can use an explicit type cast, as in this example:

SELECT CONCAT(CAST(int_col AS CHAR), char_col);

5.1 Documentations