How to use a case statement in python

Question

I have a part of the code which checks for zero and gives pass or fail

l=[dbname,tbname,python,fact, game_table]
f_query  = "select case when count(*)=1 then 'Pass' else 'Fail' end result"
f_query += " from  qa."+row.DB_NAME
f_query += " where "+ row.Field_NAME + "=0"

How can I include another when statement within this code where I need to get from a list or tuple which has l=[dbname,tbname,python,fact, game_table] which are in row.DB_NAME but when they are present then the result should be 'exp'. So, I tried something like this:

l=[dbname,tbname,python,fact, game_table]
f_query  = "select case when count(*)=1 then 'Pass' when row.DB_Name in l then 'exp'
            else 'Fail' end result"
f_query += " from  qa."+row.DB_NAME
f_query += " where "+ row.Field_NAME + "=0"

But this din't work. Can someone help me with this

Answer 1

You can join the list into a string and use a table alias to stitch together your SQL:

l=[dbname,tbname,python,fact, game_table]
f_query  = "select case when count(*)=1 then 'Pass'"
f_query += " when t1 in ({}) then 'exp'".format(','.join(l))
f_query += " else 'Fail' end result"
f_query += " from qa."+row.DB_NAME+" as t1"
f_query += " where "+ row.Field_NAME + "=0"