i am trying to import table individually using UI. I am directly importing table without creating it prior.
It gives me error message to Create the table before import.
but import option should create table structure according to file columns.
How to import without creating tables prior using PostgreSQL?
In this case ,TABLE according to the import file must be created first. IF there is no prior table , it wont work.
This may help.
http://www.postgresqltutorial.com/import-csv-file-into-posgresql-table/
Related
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 am using PostgreSQL 9.6. I have created a table with create query.
But when i checked in left panel of pgAdmin, under table i found more six columns named tableid,cmax,xmax,cmin,xmin and ctid.
When i searched about this, I found that these are OIDs column and does not affect to data on other columns.
I have to import data into this table. So after selecting table, from right click i got option for import/Export. So from that i am importing .csv file.
But when i tried to import the data in table, i am getting error like,
ERROR: column "tableoid" of relation "account" does not exist
Please suggest me how to eliminate these OID columns from table.
You must be missing some column that is present in the csv named "tableoid".
In this case ,TABLE according to the import file must be created first. IF there is no prior table , it wont work. This may help.
http://www.postgresqltutorial.com/import-csv-file-into-posgresql-table/
I'm using DataGrip 2016.3 to connect to a PostgreSQL server.
When I right click and Import From File, currently DataGrip makes assumptions about the type associated with each column
(see image for what DataGrip defaults to in the import dialog). I'd like to specify that column A is VARCHAR(50), column B is INT, column C is DATE, and so on. I will be uploading similar files multiple times, and I'd like to avoid having to specify my types each time I import. Is there a way to save and select configurations of columns A, B, and C's types?
The best way that I've found to accomplish this is to first create the destination table. Then Right-click on the table in the database tool window to launch the "Import Data from File..." wizard.
This is also great if you want the destination table to contain additional columns, such as an auto-incrementing id column.
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.
I wanted to prepare a load utility to load the data into DB2 table. The table has columns which contains GENERATEDALWAYS feature set.
So, I am not able to load an unloaded details from the table.
Is it possible to use import for tables having columns with GENERATEDALWAYS set?
Steps I did:
1. db2 "export to tbl.txt of del modified by coldel| select * from <schema.table> where col=value"
2. db2 "delete from <schema.table> where col=value"
3. db2 "import from tbl.txt of del modified by coldel| allow write access warningcount1 insert into <schema.table>"
The columns with "GENERATEDALWAYS" is having NEW Value after import. Is it possible to use import to populate GENERATEDALWAYS columns to have the old values?
Appreciate the assistance.
Thanks,
Mathew Liju
What you are asking is not possible. With IMPORT you can't override columns that have GENERATED ALWAYS. As #Peter Miehle suggests you could alter the table to specify that the column is GENERATED BY DEFAULT, but this may break other applications.
Your question's title implies that you don't want to use the LOAD utility (but you don't mention anything about it in the actual question). However, LOAD is the only way to write data into the table and maintain the values for the generated column as they exist in the file:
db2 "load from tbl.txt of del modified by generatedoverride insert into schema.table"
If you do this, be aware that:
DB2 does not check if there are conflicts with existing rows in the table. You would need to define a unique index on the column(s) in question to resolve this; this would cause DB2 to delete the rows that you just loaded in the DELETE phase of the load.
If your generated column(s) are using IDENTITY, make sure that you alter the column to ensure that future generated values do not conflict with the rows that you just inserted into the table.
maybe you can drop the "generation" from the column and add it after importing with the appropriate values again.
#Ian Bjorhovde has given you the options.
IMPORT actually does INSERTs in the background - ie, it first prepares a INSERT statement with parameter markers and uses the values in the input file for those markers.
In your SQL snapshot you will see INSERT statement that is used.
Anything that is not possible in an INSERT statement isn't possible with IMPORT (kind of .. )