Concatenate SQL string with args

Question

I am trying to use a default query and then append some conditions. I would like to know how can i concatenate a string while unpacking args.

filters = []
if industry:
    filters.append('industry_id')
    filters.append('role_id')
    ...

As far as I can see this doesn't work (invalid syntax).

print "SELECT city, " + *filters + " FROM histogram"

Answer 1

Use join to do what you need:

print "SELECT city, " + ', '.join(filters) + " FROM histogram"

which prints:

SELECT city, industry_id, role_id FROM histogram