The following two functions will always produce the same value when performed in a SQL statement:
SUM(Column1)+ SUM(Column2)
SUM(Column1 + Column2)

Question

Quizplus · Accepted Answer

SUM(Column1) + SUM(Column2) calculates the sum of each column individually and then adds those sums together, which can differ from SUM(Column1 + Column2) that sums the row-wise addition of the two columns. If there are NULL values in either column, the results can be different because NULL + a number results in NULL, affecting the total sum differently in each case.

The Following Two Functions Will Always Produce the Same Value