How to Read Data Number by Number - sql

Question

I have a field that contains numbers such as the examples below in #Numbers. Each number within each row in #Numbers relates
to many different values that are contained within the #Area table.
I need to make a relationship from #Numbers to #Area using each number within each row.
CREATE TABLE #Numbers
(
Number int
)
INSERT INTO #Numbers
(
Number
)
SELECT 102 UNION
SELECT 1 UNION
SELECT 2 UNION
select * from #Numbers
CREATE TABLE #Area
(
Number int,
Area varchar(50)
)
INSERT INTO #Area
(
Number,
Area
)
SELECT 0,'Area1' UNION
SELECT 1,'Area2' UNION
SELECT 1,'Area3' UNION
SELECT 1,'Area5' UNION
SELECT 1,'Area8' UNION
SELECT 1,'Area9' UNION
SELECT 2,'Area12' UNION
SELECT 2,'Area43' UNION
SELECT 2,'Area25' UNION
select * from #Area
It would return the following for 102:
102,Area2
102,Area3
102,Area5
102,Area8
102,Area9
102,Area1
102,Area12
102,Area43
102,Area25
For 1 it would return:
1,Area2
1,Area3
1,Area5
1,Area8
1,Area9
For 2 it would return:
2,Area12
2,Area43
2,Area25
Note how the numbers match up to the individual Areas and return the values accordingly.

Answer 1

Well, the OP marked an answer already, which even got votes. Maybe he will not read this, but here is another option using direct simple select, which (according to the EP) seems like using a lot less resources:
SELECT *
FROM #Numbers t1
LEFT JOIN #Area t2 ON CONVERT(VARCHAR(10), t1.Number) like '%' + CONVERT(CHAR(1), t2.Number) + '%'
GO
Note! According to Execution Plan this solution uses only 27% while the selected answer (written by Squirrel) uses 73%, but Execution Plan can be misleading sometimes and you should check IO and TIME statistics as well using the real table structure and real data.

Answer 2

looks like you need to extract individual digit from #Number and then used it to join to #Area
; with tally as
(
select n = 1
union all
select n = n + 1
from tally
where n < 10
)
select n.Number, a.Area
from #Numbers n
cross apply
(
-- here it convert n.Number to string
-- then extract 1 digit
-- and finally convert back to integer
select num = convert(int,
substring(convert(varchar(10), n.Number),
t.n,
1)
)
from tally t
where t.n <= len(convert(varchar(10), n.Number))
) d
inner join #Area a on d.num = a.Number
order by n.Number
or if you prefer to do it in arithmetic and not string
; with Num as
(
select Number, n = 0, Num = Number / power(10, 0) % 10
from #Numbers
union all
select Number, n = n + 1, Num = Number / power(10, n + 1) % 10
from Num
where Number > power(10, n + 1)
)
select n.Number, a.Area
from Num n
inner join #Area a on n.Num = a.Number
order by n.Number

Answer 3

Here is my idea. In theory, it should work.
Have a table (temp or permanent) with the values and it's translation
I.E.
ID value
1 Area1, Area2, Area7, Area8, Area15
2 Area28, Area35
etc
Take each row and put a some special character between each number. Use a function like string_split with that character to turn it into a column of values.
e.g 0123 will then be something like 0|1|2|3 and when you run that through string_split you would get
0
1
2
3
Now join each value to your lookup table and return the Value.
Now you have a row with all the values that you want. Use another function like STUFF FOR XML and put those values back into a single column.
This doesn't sound very efficient.. but this is one way of achieving what you desire..
Another is to do a replace().. but that would be very messy!

Answer 4

Create a third table called n which contains a single column also called n that contains integers from 1 to the maximum number of digits in your number. Make it 1000 if you like, doesn't matter. Then:
select #numbers.number, substring(convert(varchar,#numbers.number),n,1) as chr, Area
from #numbers
join n on n>0 and n <=len(convert(varchar,number))
join #area on #area.number=substring(convert(varchar,#numbers.number),n,1)
The middle column chr is just there to show you what it's doing, and would be removed from the final result.