Hi,
We are still on the process to migrate our applications from proprietary RDBMS
to PostgreSQL.
Here is a simple query executed on various systems (real query is different but
this one does not need any data) :
Connected to:
Oracle Database 19c Standard Edition 2 Release 19.0.0.0.0 - Production
Version 19.3.0.0.0
SQL> select count(*) from (select 1 from dual where 0=1 group by grouping
sets(())) tmp;
COUNT(*)
----------
0
select @@version;
GO
---------------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------
Microsoft SQL Server 2017 (RTM-CU16) (KB4508218) - 14.0.3223.3 (X64)
Jul 12 2019 17:43:08
Copyright (C) 2017 Microsoft Corporation
Developer Edition (64-bit) on Linux (Ubuntu 16.04.6 LTS)
select count(*) from (select 1 as c1 where 0=1 group by grouping sets(())) tmp;
GO
-----------
0
(1 rows affected)
select version();
version
----------------------------------------------------------------------------------------------------------------
PostgreSQL 11.5 (Debian 11.5-1+deb10u1) on x86_64-pc-linux-gnu, compiled by gcc
(Debian 8.3.0-6) 8.3.0, 64-bit
select count(*) from (select 1 from dual where 0=1 group by grouping sets(()))
tmp;
count
-------
1
(1 ligne)
0 or 1, which behaviour conforms to the SQL standard ? We have a workaround and
it's just informational.
Regards,
Phil
