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Help With Tables

Author

Topic

nhaas
Yak Posting Veteran

90 Posts

Posted - 2007-02-14 : 16:13:40

I am designing a couple tables to track DID blocks(Phone Numbers). I want to track to see if the individual numbers are being used. So if I have a block with numbers 1000 through 1999 and only numbers 1990 and 1991 are used I don’t want to put all 1000 numbers in a table (like we currently have). My question is should this be set up like this?

Table 1(available.,ie DialPlan)
StartNumber,EndNumber

Table 2(Used)
UsedNumber,AddedDate,ModifiedBy

I am trying to make this as efficient as possible

snSQL
Master Smack Fu Yak Hacker

1837 Posts

Posted - 2007-02-14 : 17:32:09

What you could do is create a table-valued function that returns a range of numbers. Here's an example (I have been lazy and used a simple loop to create the numbers, you could do it much more efficiently, but I wanted to just show you the basic idea)

create function NumberBlock(@start int, @end int)
returns @NumberBlockTable table (Number int)
as
begin
	while @start <= @end
	begin
		insert @NumberBlockTable values (@start)
		set @start = @start + 1
	end
	return
end

select * 
from NumberBlock(1000, 1999)

So then you could join that with your other table, something like

select * 
from Used
inner join NumberBlock(1000, 1999) as N 
on Used.UsedNumber = N.Number

SwePeso
Patron Saint of Lost Yaks

30421 Posts

Posted - 2007-02-15 : 03:33:16

The basic idea is right, but a much faster version is available, and named F_TABLE_NUMBER_RANGE.
Please search here at SQLTeam.

Peter Larsson
Helsingborg, Sweden

snSQL
Master Smack Fu Yak Hacker

1837 Posts

Posted - 2007-02-15 : 10:34:40

Like I said - "I have been lazy and used a simple loop to create the numbers, you could do it much more efficiently"

SwePeso
Patron Saint of Lost Yaks

30421 Posts

Posted - 2007-02-15 : 10:55:42

Yeah, I know you did.
I was referring to nhaas.

Peter Larsson
Helsingborg, Sweden

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