psql copy 命令不会正确解释 NULL 值

Question

我正在尝试将值从 csv（使用 headers）复制到 table。我看过 this answer 说要指定 NULL 值，但它似乎对我没有影响。这是我的：

CREATE TABLE stops
(
  stop_id           text PRIMARY KEY,
  --stop_code         text NULL,
  stop_name         text NOT NULL,
  --stop_desc         text NULL,
  stop_lat          double precision NOT NULL,
  stop_lon          double precision NOT NULL,
  zone_id           integer NULL,
  stop_url          text NULL,
  location_type     boolean NULL,
  parent_station    text NULL
);

\copy stops from './stops.txt' with csv header NULL AS ''

我也试过像这样使用 \N 字符：

\copy stops from './stops.txt' with csv header NULL AS '\N'

不过好像没有效果

我也尝试过尝试找到 here 的解决方案，它看起来像这样：

\copy agency from './agency.txt' WITH (FORMAT csv header, FORCE_NULL(zone_id))

但这似乎在 csv_header 部分引发语法错误。

版本为 9.6。

这是 csv 的摘录：

stop_id,stop_name,stop_lat,stop_lon,zone_id,stop_url,location_type,parent_station
"de:07334:1714:1:1","Wörth Alte Bahnmeisterei","49.048742345982","8.26622538039577","","","","Parent1714"
"de:07334:1714:1:2","Wörth Alte Bahnmeisterei","49.0484420719247","8.26673742010779","","","","Parent1714"
"de:07334:1721:1:1","Maximiliansau Eisenbahnstraße","49.0373071007148","8.29789997731824","","","","Parent1721"
"de:07334:1721:2:2","Maximiliansau Eisenbahnstraße","49.0371363175998","8.29896897250649","","","","Parent1721"

Answer 1

But this seems to throw a syntax error at the csv_header part.

在 csv 后面加一个逗号：

\copy agency from './agency.txt' WITH (FORMAT csv, HEADER, FORCE_NULL(zone_id,location_type))

显然，当使用空字符串指定 NULL 时，非文本列需要 FORCE_NULL。

psql copy 命令不会正确解释 NULL 值

psql copy command will not interpret NULL values properly

postgresql

psql