Dynamic raw query (select clause) Django - sql

Question

I'm trying to execute a raw query in Django where I dynamically want to pick column names.
Eg
def func(all=True){
if all:
query_parameters = {
'col': '*'
}
else:
query_parameters = {
'col': 'a,b,c'
}
with connections["redshift"].cursor() as cursor:
cursor.execute(
"select %(col)s from table limit 2 ;",
query_parameters,
)
val = dictfetchall(cursor)
return val
}
Django is executing it like.
select "*" from table limit 2;
so the output is just like select "*"
*
and in the else case it is executed like
select "a,b,c" from table limit 2;
so the output is a,b,c
How can I run the command so that Django run it like
select a , b , c from table limit 2
so that the output is
a b c
1 2 3
4 5 6

Answer 1

I found a hack myself.
See Here
Explanation
Prepared query step by step
Input data (Columns I need)
self.export_col = “a,b,c”
def calc_col(self):
if self.exp == 'T':
select_col = ""
self.export_col = self.export_col.split(',')
for col in self.export_col:
select_col += col + ","
select_col = select_col[:-1]
self.export_col = select_col
else:
self.export_col += '*'
def prepare_query(self):
query += " SELECT "
query += self.export_col
query += """ from table limit 2;"""