postgres csv日期为空导入错误 [英] postgres csv date null import error

问题描述

我正在将数据导入Postgres数据库.我要导入的表包括带有日期的几列.

I am importing data into a Postgres database. The table I am importing to includes a couple of columns with dates.

但是，我正在上传的CSV文件在某些​​日期字段中具有空值.

The CSV file I am uploading, however, has empty values for some of the date fields.

该表如下所示:

dot_number bigint,
legal_name character varying,
dba_name character varying,
carrier_operation character varying,
hm_flag character varying,
pc_flag character varying,
...
mcs150_date date,
mcs150_mileage bigint,

数据如下:

1000045,"GLENN M HINES","","C","N","N","317 BURNT BROW RD","HAMMOND","ME","04730","US","317 BURNT BROW RD","HAMMOND","ME","04730","US","[phone]","","","19-NOV-13","20000","2012","23-JAN-02","ME","1","2"
1000050,"ROGER L BUNCH","","C","N","N","108 ST CHARLES CT","GLASGOW","KY","42141","US","108 ST CHARLES CT","GLASGOW","KY","42141","US","[phone]","","","","72000","2001","23-JAN-02","KY","1","1"

我尝试这样做:

COPY CC FROM 'C:\Users\Owner\Documents\FMCSA Data\FMCSA_CENSUS1_2016Sep.txt' DELIMITER ',' CSV HEADER NULL '';

但是我得到这个错误:

错误:类型为date的输入语法无效:"上下文:COPY cc，行24，列mcs150_date:"**********错误**********

ERROR: invalid input syntax for type date: "" CONTEXT: COPY cc, line 24, column mcs150_date: "" ********** Error **********

错误:类型为date的输入语法无效:" SQL状态:22007内容:COPY cc，第24行，mcs150_date列:"

ERROR: invalid input syntax for type date: "" SQL state: 22007 Context: COPY cc, line 24, column mcs150_date: ""

这可能很简单，但是我在网上找到的所有解决方案都无效.

This is probably pretty simple, but none of the solutions I've found online did not work.

推荐答案

您需要指定 QUOTE 字符，以便将" 解释为 NULL，就像这样:

You need to specify the QUOTE character so that "" would be interpreted as NULL, like so:

COPY CC FROM 'C:\Users\Owner\Documents\FMCSA Data\FMCSA_CENSUS1_2016Sep.txt' DELIMITER ',' CSV HEADER QUOTE '"' NULL '';

QUOTE''是添加的内容.

文档: https://www.postgresql.org/docs/current/static/sql-copy.html

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