On 2020-12-03 20:26, Peter Eisentraut wrote:
> On 2020-12-03 16:34, Tom Lane wrote:
>> As I recall, a whole lot of the pain we have with INTO has to do
>> with the semantics we've chosen for INTO in a set-operation nest.
>> We think you can write something like
>>
>> SELECT ... INTO foo FROM ... UNION SELECT ... FROM ...
>>
>> but we insist on the INTO being in the first component SELECT.
>> I'd like to know exactly how much of that messiness is shared
>> by SQL Server.
>
> On sqlfiddle.com, this works:
>
> select a into t3 from t1 union select a from t2;
>
> but this gets an error:
>
> select a from t1 union select a into t4 from t2;
>
> SELECT INTO must be the first query in a statement containing a UNION,
> INTERSECT or EXCEPT operator.
So, with that in mind, here is an alternative proposal that points out
that SELECT INTO has some use for compatibility.