Question

I want to write mysql when statement and i can’t do it.

explanation => localParty is column in table “data”, loc is column from table “o”, and i want to compare localParty to loc, if their values are equal then i want to retrieve information from loc_m column (this column is from table “o”), and if not equal then from localParty column (from “data” table)

Please help how to write this script in mysql query ? Thanks

with this script

select (case when data.localparty = o.loc then o.loc_m else data.localparty end) 
    as customdata from data, o

it is working but it is missing exactly three result ( I mean that then data.localparty equal to o.loca it is giving result from data.localparty 3 times and after it one time it is giving result from loc_m and it is going like so .

Answer 1

You could modify the query in the following way:

SELECT IF(t1.Column1 = t2.Column2,t2.Column1,t1.Column3) FROM TABLE1 AS t1, Table2 AS t2