How many positions is player Tom Glavine?
CREATE TABLE table_21721351_18 (position VARCHAR, player VARCHAR)
SELECT COUNT(position) FROM table_21721351_18 WHERE player = "Tom Glavine"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_21721351_18 (position VARCHAR, player VARCHAR) Question: How many positions is player Tom Glavine? [/INST] SELECT COUNT(position) FROM table_21721351_18 WHERE player = "Tom Glavine" </s>