I have a csv file to import in PostgreSQL . But I don't know the table structure and column names but as far I know I need those things to create the initial tables.
so I need to know that how can I determine the table structures Please help me out!
I have a two column csv file that has only numeric data. I create a table in Postgre with the columns as numeric. I successfully use the import wizard, but it gives all my values in the postgre table as null. Not sure why.
I need to import a text or csv file in pgadmin3 or 4 for a specified table in my database. I have all the required information for the table except for the uuid. I have scripted a single file in and generated the uuid using SELECT md5(random()::text || clock_timestamp()::text)::uuid, but how do I do this for a text file or csv file that im importing into the table?
I have a CSV file file.csv.
In Postgres, I have made a table named grants:
CREATE TABLE grants
(
)
WITH (
OIDS=FALSE
);
ALTER TABLE grants
OWNER TO postgres;
I want to import file.csv data without having to specify columns in Postgres.
But if I run COPY grants FROM '/PATH/TO/grants.csv' CSV HEADER;, I get this error: ERROR: extra data after last expected column.
How do I import the CSV data without having to specify columns and types?
The error is normal.
You created a table with no column. The COPY command try to import data into the table with the good structure.
So you have to create the table corresponding to your csv file before execute the COPY command.
I discovered pgfutter :
"Import CSV and JSON into PostgreSQL the easy way. This small tool abstract all the hassles and swearing you normally have to deal with when you just want to dump some data into the database"
Perhaps a solution ...
The best method for me was to convert the csv to dataframe and then follow
https://github.com/sp-anna-jones/data_science/wiki/Importing-pandas-dataframe-to-postgres
No, it is not possible using the COPY command
If a list of columns is specified, COPY will only copy the data in the
specified columns to or from the file. If there are any columns in the
table that are not in the column list, COPY FROM will insert the
default values for those columns.
COPY does not create columns for you.
I have a table say test_table(id integer check (id>10 and id<100)).
So what should I do to import all the rows that are in the range of the above mentioned check from CSV file.
The typical way to import a table from csv would be to use copy. copy stops at the first error, so that command is not going to work.
I would suggest that you insert the data into a staging table, the load the results from the staging table into the final table. You can drop the staging table when you are done.