如果您只需要每天计数，请使用以下方法：

SELECT DATE_FORMAT(date, '%m/%d/%Y') AS Dates, count(*) as count 
   FROM API_phones 
  WHERE date BETWEEN NOW() - INTERVAL 30 DAY AND NOW()
Group by
  Dates
  ORDER BY Dates ASC

如果您每天每次延期都需要它，您可以尝试以下方法：

SELECT DATE_FORMAT(date, '%m/%d/%Y') AS Dates, extension, count(*) as count 
   FROM API_phones 
  WHERE date BETWEEN NOW() - INTERVAL 30 DAY AND NOW()
Group by
  Dates, extension
  ORDER BY Dates ASC

SELECT DATE_FORMAT(date, '%m/%d/%Y') AS Dates, COUNT(*) AS entry_count
   FROM API_phones 
  WHERE date LIKE '%' AND date BETWEEN NOW() - INTERVAL 30 DAY AND NOW()
  GROUP BY Dates
  ORDER BY Dates ASC

如果您需要每天的条目数，您应该使用count（*）和group by

SELECT DATE_FORMAT(date, '%m/%d/%Y') AS Dates, count(*) num_entries 
   FROM API_phones 
   WHERE date BETWEEN NOW() - INTERVAL 30 DAY AND NOW() 
   GROUP BY Dates
   ORDER BY Dates ASC