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I found a very interesting/strange thing about MAX() function in SQL.
I have column ID with varchar2(20) data type, having following entries:-
ID
1
2
3
4
5
6
9
99
909
As per my understanding if i use “select max(ID) from table;” I should get 909 as the result but i get 99. Can somebody explain why this is happening?
Since the column you are using MAX on is of type VARCHAR, it is going to sort the values based on a character-by-character evaluation. It selects 99 because 9 > 0, and it will ignore the rest of the string.