update vs modify

[BrahmanandaRao]

Hi Guys

what is the main differences update and modify which is best .could you please give some key differences 

[JosvanderVelden]

The SAS documentation has a comparison of merge, update and modify here:
https://documentation.sas.com/doc/en/pgmsascdc/9.4_3.5/basess/n1qgf6rn4q6h39n15n9613l3z1d2.htm
And you can also have a look here: https://documentation.sas.com/doc/en/pgmsascdc/9.4_3.5/lepg/p1pa3hnpchkgf7n1etensx665yxr.htm & https://documentation.sas.com/doc/en/pgmsascdc/9.4_3.5/sqlproc/p1typbj1zqaum2n13o7mph0tdqsc.htm & https://www.lexjansen.com/wuss/2014/80_Final_Paper_PDF.pdf

[Kurt_Bremser]

Maxim 1: Read the Documentation (links provided by @JosvanderVelden)

Then, if something puzzles you, come back with that specific point.