在后台运行程序时，数据库报错 ERROR: COALESCE types character varying and integer cannot be matched
coalesce(b.chk_type,-1) 中 b.chk_type是字符类型，与-1不匹配
建议，将使用字符串 '-1'
或 将字段转换成数值类型 视情况而定
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