Greenplum【异常 03】COPY命令报错 ＞ ERROR: invalid input syntax for type double precision: ““（问题分析及解决方案）数据去重

# 使用COPY数据导出
COPY (
  SELECT 
    id,
    name,
    code,
    hitrate,
    MAX ( createdate ) AS createdate 
  FROM
    testTableName
  GROUP BY
    id,
    name,
    code,
    hitrate
  ) TO '/test/testTableName.csv' WITH CSV HEADER DELIMITER AS ',';
# 使用COPY装载数据
COPY testTableName FROM '/test/testTableName.csv' WITH CSV HEADER DELIMITER AS ',';