Thanks for the good question. 🙂

wish to see more like this.

(I guess this depends on the initial type of the data which in the first position.

For this "select '130'+'120'+1" it will give you 130121, but for this "select 1+'120'+'130'" it will give you 251 not 121130. It takes the next value and it converts to the first value's data-type and then so on...

select 0 + '130'+'120'+1 - this gives 251 (because the initial value type is number and it works for only int type)

select 0 + '130'+'120'+2.56 - and the decimal works only with the end value.)