Create Table FinancialYear (fiscal_year INTEGER NOT NULL PRIMARY KEY, start_date DATE NOT NULL, CHECK ((EXTRACT(YEAR FROM start_date)=fiscal_year-1) AND (EXTRACT (MONTH FROM start_date)=10) AND (EXTRACT(DAY FROM start_date)=1), end_date DATE NOT NULL, CONSTRAINT valid_end_date CHECK ((EXTRACT (YEAR FROM end_date)=fiscal_year) AND (EXTRACT (MONTH FROM end_date)=9) AND (EXTRACT (DAY FROM end_date)=30)))
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