From: | Serge Fonville <serge(dot)fonville(at)gmail(dot)com> |
---|---|
To: | Darren Duncan <darren(at)darrenduncan(dot)net> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: INSERT... WHERE |
Date: | 2013-01-15 09:15:44 |
Message-ID: | CAOAS_++genXVjQjRSH8MGohxMwLGJZ25FaRrpCc69cpmiOoYcw@mail.gmail.com |
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Lists: | pgsql-general |
Hi,
Based on my understanding of the problem, would this be possible to solve
with a MERGE statement?
HTH
Kind regards/met vriendelijke groet,
Serge Fonville
Convince Microsoft!
They need to add TRUNCATE PARTITION in SQL Server
https://connect.microsoft.com/SQLServer/feedback/details/417926/truncate-partition-of-partitioned-table
2013/1/15 Darren Duncan <darren(at)darrenduncan(dot)net>
> On 2013.01.13 6:00 PM, Robert James wrote:
>
>> I have a lot of VALUES I want to INSERT. But only a subset of them -
>> only those that meet a JOIN criteria involving another table.
>>
>> I could INSERT them into a temp table, and then do a SELECT INTO. But
>> do I need to do that? Is there any way to do a INSERT... VALUES ...
>> WHERE...
>>
>
> As per my reply to your "Bulk INSERT with individual failure" thread, for
> what you want to do a temporary staging table (or several) with minimal
> constraints is truly your best option to accomplish your goal.
>
> Having a large amount of literals in an INSERT statement like discussed is
> a bad idea.
>
> If you're loading from a file, just use some bulk load feature that
> bypasses the need for INSERT statements, into some temp file matching the
> format of the file.
>
> If you're loading from a program, use a prepared single-row INSERT
> statement, bundling batches of say a few thousand rows at a time into a
> single transaction.
>
> Then pretend your newly populated temp table was your original source, but
> now it is visible to SQL, and you can load your regular tables from the
> temp table(s) much more nicely.
>
> -- Darren Duncan
>
>
>
>
> --
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