How many total units were built of Model ds-4-4-660 with a b-b wheel arrangement and a PRR Class of bs6?
CREATE TABLE table_name_13 (total_produced INTEGER, builder’s_model VARCHAR, wheel_arrangement VARCHAR, prr_class VARCHAR)
SELECT SUM(total_produced) FROM table_name_13 WHERE wheel_arrangement = "b-b" AND prr_class = "bs6" AND builder’s_model = "ds-4-4-660"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_13 (total_produced INTEGER, builder’s_model VARCHAR, wheel_arrangement VARCHAR, prr_class VARCHAR) Question: How many total units were built of Model ds-4-4-660 with a b-b wheel arrangement and a PRR Class of bs6? [/INST] SELECT SUM(total_produced) FROM table_name_13 WHERE wheel_arrangement = "b-b" AND prr_class = "bs6" AND builder’s_model = "ds-4-4-660" </s>