user: Question: How many subjects have the pinyin Shixun?
Columns: ['Chapter', 'Chinese', 'Pinyin', 'Translation', 'Subject']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, '釋詁', 'Shigu', 'Explaining the Old [Words]', 'verbs, adjectives, adverbs, grammatical particles']
SQL:

assistant: SELECT COUNT("Subject") FROM "Table" WHERE "Pinyin" = 'Shixun';