Updating column conditional on other columns - sql

Question

My server was crashed, damaging my database. In one of my tables I have an academic_quality column where I store school grades like A, B, C+, D. Somehow, my grades are not distributed through other columns on some rows. I thought I could create a conditional clause and create a new column, academic_quality_new, and update it after checking other columns. I tried the following query but it did not work.
SELECT academic_quality, acceptance_rate, undergrads, setting, environment, degrees_offered,
CASE WHEN (academic_quality OR acceptance_rate OR undergrads OR setting OR environment OR degrees_offered) = 'A' THEN INSERT 'A' INTO academic_quality_new
CASE WHEN (academic_quality OR acceptance_rate OR undergrads OR setting OR environment OR degrees_offered) = 'C' THEN INSERT 'B' INTO academic_quality_new
FROM [school_List_V4]
Any help would be appreciated!

Answer 1

You can try by adding case..when for all available grades.
First you can execute select query and check result
select * ,
case when academic_quality = 'A' OR acceptance_rate = 'A' then 'A'
else case when academic_quality ='B' OR acceptance_rate = 'B' then 'B'
else case when academic_quality = 'C' OR acceptance_rate = 'C' then 'C'
else '--'
end
end
end
from table1
then try this update query, it will update new column. If 2 cases are true then it will take first case, so case on grades should be from highest to lowest.
update table1
set new =
case when academic_quality = 'A' OR acceptance_rate = 'A' then 'A'
else case when academic_quality ='B' OR acceptance_rate = 'B' then 'B'
else case when academic_quality = 'C' OR acceptance_rate = 'C' then 'C'
else '--'
end
end
end
and final updated new column is select * from table1
academic_quality | acceptance_rate | new
A | NULL | A
NULL | B | B
NULL | NULL | --
A | B | A
C | B | B