Created external table but it's empty - sql

Question

I want to create an external table from a .csv file I uploaded to the server earlier.
In Bline (shell for Hive), I tried running this script:
CREATE EXTERNAL TABLE c_fink_category_mapping (
trench_code string,
fink_code string
)
row format delimited fields terminated by '\073' stored as textfile
location '/appl/trench/dev/data/in/main/daily_wf/fink_category_mapping'
TABLEPROPERTIES ('serialization.null.format' = '')
;
which creates the table w/o any error byt the table itself is empty.
Help would be appreciated.
My textfile is populated with data.

Answer 1

First, check if the location path is correct.
Then try with this configuration:
CREATE EXTERNAL TABLE c_fink_category_mapping (
trench_code string,
fink_code string
)
ROW FORMAT SERDE
'org.apache.hadoop.hive.serde2.OpenCSVSerde'
WITH SERDEPROPERTIES (
'quoteChar'='"',
'separatorChar'=',')
STORED AS INPUTFORMAT
'org.apache.hadoop.mapred.TextInputFormat'
OUTPUTFORMAT
'org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat'
LOCATION
'/appl/trench/dev/data/in/main/daily_wf/fink_category_mapping';

Answer 2

response provided above seems to be correct:
CREATE EXTERNAL TABLE c_fink_category_mapping (
trench_code string,
fink_code string
)
ROW FORMAT SERDE
'org.apache.hadoop.hive.serde2.OpenCSVSerde'
WITH SERDEPROPERTIES (
'quoteChar'='"',
'separatorChar'=',')
STORED AS INPUTFORMAT
'org.apache.hadoop.mapred.TextInputFormat'
OUTPUTFORMAT
'org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat'
LOCATION
'/appl/trench/dev/data/in/main/daily_wf/fink_category_mapping';
This will create the table using a comma as the delimiter, which should correctly parse the data in your CSV file and populate the table with the data from the file. You can also specify a different delimiter character, such as '\t', if that is more appropriate for your data.