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From: Voillequin, Jean-Marc <[email protected]>
To: [email protected] <[email protected]>
Subject: execution id
Date: Tue, 30 Aug 2022 16:22:45 +0000
Message-ID: <MN2PR20MB27356F937609C465A9FD9B2EBE799@MN2PR20MB2735.namprd20.prod.outlook.com> (raw)

Hello guys,

Is there a kind of magical system administration function that returns a unique id each time a select/insert/update/delete statement is launched?

Assuming x is a table with several rows:

select pg_magical_exec_id() from x;

  *   returns 1 for each row

insert into x select pg_magical_exec_id() from x;

  *   pg_magical_exec_id()=2

Select 1 from x where pg_magical_exec_id()>0;

  *   pg_magical_exec_id=3

Select pg_magical_exec_id() from x;

  *   returns 4 for each row

And even, in a transaction:

Begin;
delete from x where ...;

  *   pg_magical_exec_id=5
update x set ... ;

  *   pg_magical_exec_id=6
End;

Select pg_magical_exec_id() from x;

  *   returns 7 for each row

I can understand it is a strange question!
There is a txid_current() function that could fit, but the transaction id does not change within a transaction.



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