'Creating a new variable based on values of previous rows in impala sql
Hi I have this data set
ID DATE PROCEDURE WANT_VARIABLE (check previous procedure?)
1 03/01/2022 MRI NO here ID 1 didnot had MRI before so no
1 03/06/2022 CT NO here ID 1 didnot had ct before so no
1 03/15/2022 MRI YES here ID 1 had MRI before so YES
2 03/08/2022 CT NO here ID 2 didnot had CT before so no
2 03/18/2022 CT YES here ID 2 had CT before so yes
what I want is a want_variable which look for previous rows value in procedure if they had same procedure in previous dates then say yes then say no
Thank you
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