How to take unique rows based on two columns

Hi,

I have below previousDdata and currentData (cell matrix), and I want extract and add to currentData the unique rows based on column2 & column3(which does not exists in currentData) of previousData.

previousData: 
Date       PreName   PostName  score   rank 
2018-01-01   A         V         12     23
2018-01-01   H         Q         45     95
2018-01-02   B         K         10     36

currentData: 
Date       PreName   PostName  score   rank 
2018-01-01   A         V         12     23
2018-01-01   H         Q         45     95
2018-05-12   P         N         10     36
2018-06-14   X         G         10     36

for example: row3 (B & K), does not exists in currentData, so I will retain it from previousData. My desired output is:

result: 
Date       PreName   PostName  score   rank 
2018-01-01   A         V         12     23
2018-01-01   H         Q         45     95
2018-05-12   P         N         10     36
2018-06-14   X         G         10     36
2018-01-02   B         K         10     36

[Image Analyst]

Please read this link and attach your table in a .mat file to make it easy for people to help you.

Answer 1

[Image Analyst]

Try findgroups().

By the way, a table is NOT a cell matrix. They are two totally different kinds of variables!

Oh, and also please read this link to learn how to format your questions so people can read them.