your function is basicaly SUM two or more numbers or variables. For example: You need to know a result from 10 + 3 = 13 in SQL: SELECT SUM(10+3) Cleary that's is a simple exemplification ...

Operasi ini bisa berupa kalkulasi numerik seperti sum, count, avg, etc; atau operasi non-numerik seperti string concatenations dan sub-strings. SQL Function dapat dibagi ke dalam 2 kategori, ...