mysql查詢sum出來數據是decimal，轉換成int

mysql查詢count數據是decimal，用python轉換json格式的時候會報錯，在查詢的時候處理成無符號型，用cast

查詢出來countNum是Decimal 
SELECT gid, SUM(number) countNum FROM `gift_tb` WHERE tid="1" GROUP BY gid

轉換成無符號型
SELECT gid, CAST(SUM(number) AS SIGNED ) AS countNum FROM `gift_tb` WHERE tid="1" GROUP BY gid

 

處理完成。