Database: yelp
Question: How many restaurant are there in the Hazelwood district of Dallas ?
SQL:
SELECT COUNT ( DISTINCT t1.name ) FROM category AS t3 JOIN business AS t1 ON t3.business_id  =  t1.business_id JOIN neighbourhood AS t2 ON t2.business_id  =  t1.business_id WHERE t1.city  =  "Dallas" AND t3.category_name  =  "restaurant" AND t2.neighbourhood_name  =  "Hazelwood";