Which class from 1928 had a class to 1928 of BDi-21?
CREATE TABLE table_name_88 (class_from_1928 VARCHAR, class_to_1928 VARCHAR)
SELECT class_from_1928 FROM table_name_88 WHERE class_to_1928 = "bdi-21"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_88 (class_from_1928 VARCHAR, class_to_1928 VARCHAR) Question: Which class from 1928 had a class to 1928 of BDi-21? [/INST] SELECT class_from_1928 FROM table_name_88 WHERE class_to_1928 = "bdi-21" </s>