user: Question: What is the first number in series that had the production code 1ACX03?
Columns: ['No. in series', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, '" Death Has a Shadow "', 'Peter Shin', 'Seth MacFarlane', 'January31,1999', '1ACX01']
SQL:

assistant: SELECT "No. in series" FROM "Table" WHERE "Production code" = '1ACX03';