Pass Table Values into Variables - sql

Question

I have a table with Names and some values. I want to pass the values associated to the names into another table to prepopulate a list of values. I'm not sure the best way to approach this either by creating a function or procedure.
Below is the query I have now where I have to SET the variables manually. But rather doing it manually I would like to pass the values from the other table into this. How would I do this?
Example I have a table called ABC and in that table 3 values
Name|AVG |DEV
A |1.89|.74
B |2.43|1.20
C |.74 |.12
I want to pass the all the values from that table in the query below. The AVG value in the table into the #AVG variable in the below query and the DEV value in the table into the #deviation table below.
The results can be put into a new table or in a query.
DECLARE #avg DECIMAL(4,1) = 1.89 --this would be row 1 (value A) avg
DECLARE #deviation DECIMAL(4,1) = 0.74 --this would be row 1 (value A) DEV
DECLARE #startnum DECIMAL(4,1)= #Avg - (#deviation * 3)
DECLARE #endnum DECIMAL(4,1)= #Avg + (#deviation * 3)
;
WITH gen AS (
SELECT CAST(#startnum AS decimal(4,1)) AS Mulitiple
UNION ALL
SELECT CAST(Mulitiple+.1 AS decimal(4,1)) FROM gen WHERE Mulitiple+.1<=#endnum
)
SELECT A.Mulitiple , CAST(((A.Mulitiple-#avg)/#deviation) AS DECImAL(4,2)) AS ZScore
,Z.Y AS Area
FROM gen AS A
LEFT JOIN STAT..ZScore AS Z ON CAST(((A.Mulitiple-#avg)/#deviation) AS DECImAL(4,2)) = CAST(Z.Zscore AS decimal(4,2))
--WHERE Z.Y IS NOT NULL
option (maxrecursion 10000)

Answer 1

This approach uses a tally function named dbo.fnNumbers to generate the range of zscores.
dbo.fnNumbers
create function [dbo].[fnNumbers](
#zero_or_one bit,
#n bigint)
returns table with schemabinding as return
with n(n) as (select null from (values (1),(2),(3),(4)) n(n))
select 0 n where #zero_or_one = 0
union all
select top(#n) row_number() over(order by (select null)) n
from n na, n nb, n nc, n nd, n ne, n nf, n ng, n nh,
n ni, n nj, n nk, n nl, n nm, n np, n nq, n nr;
Query
drop table if exists #abc;
go
create table #abc(
[name] varchar(2),
[avg] decimal(4,1),
[dev] decimal(4,1));
insert #abc([name], [avg], [dev]) values
('a', 1.89, .74),
('b', 2.43, 1.20),
('c', 0.74, .12);
select a.[name], gen.multiple, gen_z.zscore, z.y as area
from #abc a
cross apply dbo.fnNumbers(1, cast(2*(a.dev*3)+0.1 as decimal(4,1))*10) fn
cross apply (values (cast((a.[avg]-(a.dev*3)+(fn.N-1)*0.1) as decimal(4,1)))) gen(multiple)
cross apply (values (cast(((gen.multiple-a.[avg])/a.dev) AS decimal(4,2)))) gen_z(zscore)
left join stat..zscore z on gen_z.zscore=cast(z.zscore as decimal(4,2))
order by a.[name], gen.multiple;

Answer 2

If I understand correctly, you can just use JOIN. In this case, you can introduce the table using CROSS JOIN:
SELECT ABC.*, A.Mulitiple ,
CAST(((A.Mulitiple - ABC.avg) / ABC.dev) AS DECImAL(4, 2)) AS ZScore
,Z.Y AS Area
FROM ABC CROSS JOIN
gen a LEFT JOIN
STAT..ZScore Z
ON CAST(((A.Mulitiple - abc.avg)/ abc.dev) AS DECIMAL(4,2)) = CAST(Z.Zscore AS decimal(4,2))
--WHERE Z.Y IS NOT NULL
You can avoid having the formula twice by using:
SELECT ABC.*, A.Mulitiple, v.ZScore, Z.Y AS Area
FROM ABC CROSS JOIN
gen a CROSS APPLY
(VALUES (CAST((A.Mulitiple - ABC.avg) / ABC.dev AS DECImAL(4, 2))
) v(Zscore) LEFT JOIN
STAT..ZScore Z
ON v.ZScore = CAST(Z.Zscore AS decimal(4,2))
--WHERE Z.Y IS NOT NULL