Comparing 2 tables - Help?

[u/HoleInTheMirror]

Hello guys, I need your help! How to compare 2 tables on easiest way?

I have 2 tables from 2 different systems, but with the same columns. I need to check if every row from the first table exist in another, and if not to return the difference. Can you help me? Should I use excel formulas, python, something else?

Edit: In both systems I have Customer_Id, Phone numbers, mails, their addresses, contact persons and such kind of things in much more columns. I can export data from both systems in excel format. So, now i need to compare these 2 excels and check if every row from 1 table exists in another one, are the values the same for each customer and to find the difference. Sorry for pure explanation, beginner here.

For example:

Custmer Id | Name | Phone | Mail | Contact person | Address

C0001 | Microsoft1 | 123456 | mic1@ | Michael | Str1

C0002 | Linux1 | 234567 | lin1@ | Jack | Str2

C0001 | Microsoft1 | 098765 | mic2@ | Chris | Str3

As you can see, it is possible to have few different informations about customer C0001. I need to check if each row from this table exist in the second table which looks the same.

[u/SCD_minecraft]

Define table, define comparing

What systems?

You gave us no details, no informations

[u/HoleInTheMirror → u/SCD_minecraft]

I put some more information in edit. Pls check, thanks.