How to check for duplicate rows/items in table?

[guin.anirban]

First you count how many rows are there. Get the 1st row value of the "Level" column and compare it with the rest of the values of the same column. If any matches found then no need to proceed further and exit from the function (If you are going to test this one by preparing a function). If no matches found then you get the 2nd row value of the "Level" column and compare it with the rest of the values of the same column.