在后台運行程序時，數據庫報錯 ERROR: COALESCE types character varying and integer cannot be matched
coalesce(b.chk_type,-1) 中 b.chk_type是字符類型，與-1不匹配
建議，將使用字符串 '-1'
或 將字段轉換成數值類型 視情況而定
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