Re: [NOVICE] COPY from temp table to main table insted of INSERT INTO
| От | Stephen Froehlich |
|---|---|
| Тема | Re: [NOVICE] COPY from temp table to main table insted of INSERT INTO |
| Дата | |
| Msg-id | DM5PR06MB2891B4BF64C2B418AE6862F6E5AE0@DM5PR06MB2891.namprd06.prod.outlook.com обсуждение исходный текст |
| Ответ на | Re: [NOVICE] COPY from temp table to main table insted of INSERT INTO ("David G. Johnston" <david.g.johnston@gmail.com>) |
| Ответы |
Re: [NOVICE] COPY from temp table to main table insted of INSERT INTO
Re: [NOVICE] COPY from temp table to main table insted of INSERT INTO |
| Список | pgsql-novice |
I have already copied the source data over from R in an unnormalized form and then am normalizing it in SQL (via a series of queries).
Thanks,
Stephen
From: David G. Johnston [mailto:david.g.johnston@gmail.com]
Sent: Tuesday, July 11, 2017 11:00 AM
To: Stephen Froehlich <s.froehlich@cablelabs.com>
Cc: pgsql-novice@postgresql.org
Subject: Re: [NOVICE] COPY from temp table to main table insted of INSERT INTO
On Tue, Jul 11, 2017 at 9:45 AM, Stephen Froehlich <s.froehlich@cablelabs.com> wrote:
I tend to do mass inserts to my database, but INSERT INTO is taking quite a while for 100k values.
What is the syntax for using the COPY command to copy a well formatted temp table to the “end” of the primary table? I am having trouble understanding https://www.postgresql.org/docs/9.5/static/sql-copy.html.
Tables don't have beginnings or ends.
Are you intending to use client software to access the source data or are you planning on putting the source data in a location where the server o/s user can see it?
If you already have an actual temporary table inside the database you wouldn't use COPY. COPY is intended to transfer data from/to an external file (including stdin/stdout).
Generally:
(in psql)
BEGIN;
CREATE TEMP TABLE tmptbl ( cols );
\copy tmptbl from '/tmp/file-to-load.csv' with ( ... )
INSERT INTO tbl SELECT * FROM tmptbl;
COMMIT;
\copy in psql constructs an appropriate "COPY" SQL command, executes it on the server, and then funnels the contents of "file" to the server.
David J.
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