查询时 Hive 表输出显示一个不存在的 Null 值答案

【问题标题】：Hive Table output shows one non existent Null values when Queried查询时 Hive 表输出显示一个不存在的 Null 值
【发布时间】：2020-02-04 08:55:24
【问题描述】：

我知道有人问过类似的问题，但我的 Select 查询 FOR THE HIVE TABLE 返回所有正确的列和一个额外的 NULL 列。

我创建了一个 HIVE 表，现在尝试使用 SELECT 查询它

DDL：

表 DDL：

CREATE TABLE IF NOT EXISTS family (name STRING COMMENT 'Member Name', 
Age INT COMMENT 'Age of the Member', 
floor INT COMMENT 'Residence floor', 
salary float COMMENT 'per month salary', 
birthplace STRING COMMENT 'State of birth', 
education STRING, 
gender STRING )
COMMENT 'basic details of fmaily members'
LOCATION " /user/hive/warehouse/family/MANJREKAR"
TBLPROPERTIES ('creator'='Sarang', 'created_at'='2019-10-06 14:00:00') ;

DML：

LOAD DATA LOCAL INPATH '/Users/tcssig/Documents/Hive/warehouse/Imports' OVERWRITE INTO TABLE family;

要加载的数据

A   50  3   90000   Maharshtra  UG  M
B   46  3   40000   Maharshtra  UG  F
C   15  3   0   MP          HS  F
D   24  3   10000   Maharshtra  PG  F
E   85  3   7000    Maharshtra  HS  F
F   28  2   60000   MP          UG  M
G   59  2   60000   Maharshtra  UG  M
H   21  2   0   MP          HS  F
I   28  2   25000   Maharshtra  PHD F
J   32  1   30000   Maharshtra  PG  M
K   26  1   0   MP          UG  F
L   58  1   55000   Maharshtra  UG  F
M   63  1   25000   Maharshtra  UG  M

选择姓名，家庭工资；

输出：

"A",50,3,90000,"Maharshtra","UG","M"    NULL
"B",46,3,40000,"Maharshtra","UG","F"    NULL
"C",15,3,0,"MP","HS","F"    NULL
"D",24,3,10000,"Maharshtra","PG","F"    NULL
"E",85,3,7000,"Maharshtra","HS","F" NULL
"F",28,2,60000,"MP","UG","M"    NULL
"G",59,2,60000,"Maharshtra","UG","M"    NULL
"H",21,2,0,"MP","HS","F"    NULL
"I",28,2,25000,"Maharshtra","PHD","F"   NULL
"J",32,1,30000,"Maharshtra","PG","M"    NULL
"K",26,1,0,"MP","UG","F"    NULL
"L",58,1,55000,"Maharshtra","UG","F"    NULL
"M",63,1,25000,"Maharshtra","UG","M"    NULL

如何仅获取查询的选定列？

【问题讨论】：

标签： hive hiveql

【解决方案1】：

您的整行似乎都进入了名称字段。所有其他字段为空。

由于这是第一个字段，我敢打赌您在文件中的分隔符不是您在代码中指定的。

您似乎有逗号分隔的数据，这不是 Hive 表的默认设置。

在此处查看有关声明表的正确语法的示例：https://stackoverflow.com/a/48616635

【讨论】：