Comments on: Dummy data without dummy tables – just a little SQL trick with the TABLE operator

By: Rumesh

Rumesh — Wed, 17 Oct 2007 10:00:48 +0000

Is this possible with SQL2005. I tried this but it did not work..

I have a small problem. I need to create a view to generate a report. The view has one column called month. The values for this column do not come from any database table. It is coming from the report period (ex:- 01/01/2007 to 31/01/2007) – here month is january. If it is more than one month the values for the other fields must be properly distributed. That is there will be 3 months entries in the case of three months. How can i do this?

By: chirag

chirag — Thu, 07 Dec 2006 16:44:14 +0000

How can i do same thing in MS-SQL 2000
Please give me anser ASAP.

I can not able to execute
select * from table ( num_tbl(1,2,3,4,5,6) ) in MS-SQL
Please tell me what is correct syntax in MS-SQL ?

Thankx in Advance

By: Janusz Perek

Janusz Perek — Thu, 30 Nov 2006 17:30:50 +0000

Because there no condition after connect by. SQL> select rn from ( 2 select rownum rn 3 from dual 4 connect by rownum select rn from ( 2 select level rn 3 from dual 4 connect by level

By: Patrick Sinke

Patrick Sinke — Wed, 29 Nov 2006 17:16:22 +0000

mydb> select rownum
2 from dual
3 connect by rownum;
connect by rownum
*
FOUT in regel 3:
.ORA-00920: invalid relational operator

Verstreken: 00:00:00.04
mydb>

hhhm… this doesn’t work here. Odd.

By: Lucas Jellema

Lucas Jellema — Mon, 27 Nov 2006 14:56:02 +0000

Thanks for all your comments. My reactions:

- Marco: the query against DUAL would be something like
SELECT ‘Tobias’ FROM DUAL
UNION
SELECT ‘Mike’ FROM DUAL
UNION
SELECT ‘John’ FROM DUAL
etc.

I find that awkward.

- Francois: good point – although I probably would never remember the exact TYPE.

- Edwin: this would work but basically only for a set of numbers counting from 1 to somewhere. If you want to query strings or a specific set of numeric records, this does not help.

By: Edwin van Meerendonk

Edwin van Meerendonk — Mon, 27 Nov 2006 14:06:24 +0000

in the sector “useless queries”, my five cents

select rownum
from dual
connect by rownum

By: Francois

Francois — Mon, 27 Nov 2006 11:25:28 +0000

Hello,
You can obtain the same result without creating any type, but using existing ones:
SELECT * FROM TABLE( sys.dbms_debug_vc2coll (‘John’,'Mike’,'Tobias’) ) ;

By: Marco Gralike

Marco Gralike — Mon, 27 Nov 2006 11:24:28 +0000

Could you explain why using DUAL is an awkward solution for the problem you demonstrated? Using the dummy table DUAL is, as you know, optimized for performance; Has this been changed; Are there equally good solutions now (like the ones which are mentioned above)?

Grz

Marco