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by tremon 1399 days ago
Yes, but a common table expression is still bound to only one query. You can use it multiple times within the same query, but you still can't save a common table expression in a variable and re-use it in multiple queries.

This is what I'd what to do if common table expression really were common:

  SELECT c1, c2
  FROM DifficultJoinStructure
  AS myCte;

  WITH myCte
  SELECT c1, c2
  WHERE SomeCondition(c1);

  WITH myCte
  SELECT c1, c2
  WHERE SomeCondition(c2);
1 comments
TristanBall 1399 days ago
So.. a view then?

Granted most environments effectively treat views as DBA/Sysadmin owned objects, especially where end users/apps are effectively sharing one, or a small number, of user accounts.

But given user=schema aspect several of the traditional databases, I get the impression the original intent might have been a little more laissez fair?

Of course the same can be said for tables, and that was perhaps a little idealistic!

Views aren't always quite as composable as you'd like either, or maybe I'm just scarred by the particular DB engines I use most.

So I actually agree with you, but unfortunately SQL requires that the "WELL AKSHWELLY" be followed by one or more "BUT" clauses.

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