On 7/6/22 12:51, Matthias Apitz wrote:
> El día miércoles, julio 06, 2022 a las 02:33:42p. m. -0500, Ron escribió:
>
>> On 7/6/22 01:18, Matthias Apitz wrote:
>> [snip]
>>> Ofc, each table has its own primary key(s), used for example for the
>>> SELECT ctid, * FROM d01buch WHERE ...
>>>
>>> As I said, we came to PostgreSQL from Sybase (and Oracle) and Sybase has
>>> for each table a so called SYB_IDENTITY_COLUMN which is static for the
>>> table and its value does not change.
>>
>> The DBA who designed that should be flogged for pretending that
>> SYB_IDENTITY_COLUMN is a primary key.
>
> Now things are coing to blaming. Nobody said that SYB_IDENTITY_COLUMN
> is a primary key, but it is uniqu to identify a row in a table once
> known.
Which is the definition of a PRIMARY KEY. At any rate as has been noted
repeatedly ctid is not that.
>
> matthias
--
Adrian Klaver
adrian.klaver@aklaver.com