Dynamic Operators in SQL - sql-server

Question

Let's say I have the following table tbl_Rules:
RuleID NameOperator NameValues TypeOperator TypeValue
1 NotIn John In 2
1 NotIn Alex In NULL
1 NotIn Mike In NULL
2 In Mike NotIn 2
And my source table looks like this tbl_Source:
ID Name Type Cost
1 Mike 2 100
2 Cole 2 200
3 Ken 1 300
4 Tara 1 400
5 Mike 1 500
6 Sonya 1 600
7 Ann 2 700
8 Mike 1 800
I want to be able to join these two tables and get the following result tbl_Result:
RuleID Name Type Cost
1 Cole 2 200
1 Ann 2 700
2 Mike 1 500
2 Mike 1 800
If I was writing this query manually my query would look like this:
select 1, Name, Type, Cost
from tbl_Source
Where Name not in ('John', 'Alex', 'Mike') and Type in (2)
union all
select 2, Name, Type, Cost
from tbl_Source
where Name in ('Mike') and Type not in (2)
In my current setup tbl_Rule has 500 records and tbl_Source has 500k records.
Any advice on this can be achieved is greatly appreciated. Limitations:
No CLR functions, No 2017 features (e.g. String_agg)
Update: DDL statements for the above sample can be found here: http://sqlfiddle.com/#!18/9a29f/2/0

Answer 1

Here's one way. I have used cross join to check the rules. There may be better ways with dynamic SQL where rules are implemented in join
declare #tbl_Rules table(
RuleID int
, NameOperator varchar(20)
, NameValues varchar(20)
, TypeOperator varchar(20)
, TypeValue int
)
insert into #tbl_Rules
values
(1, 'NotIn', 'John', 'In', 2)
, (1, 'NotIn', 'Alex', 'In', NULL)
, (1, 'NotIn', 'Mike', 'In', NULL)
, (2, 'In', 'Mike', 'NotIn', 2)
declare #tbl_Source table (
ID int
, Name varchar(20)
, Type int
, Cost int
)
insert into #tbl_Source
values
(1, 'Mike', 2, 100)
, (2, 'Cole', 2, 200)
, (3, 'Ken', 1, 300)
, (4, 'Tara', 1, 400)
, (5, 'Mike', 1, 500)
, (6, 'Sonya', 1, 600)
, (7, 'Ann', 2, 700)
, (8, 'Mike', 1, 800)
;with cte as (
select
distinct Ruleid, a.NameOperator, a.TypeOperator
, NameValues = (
select
'!' + b.NameValues
from
#tbl_Rules b
where
a.RuleID = b.RuleID
and b.NameValues is not null
for xml path('')
) + '!'
, TypeValue = (
select
concat('!', b.TypeValue)
from
#tbl_Rules b
where
a.RuleID = b.RuleID
and b.TypeValue is not null
for xml path('')
) + '!'
from
#tbl_Rules a
)
select
b.RuleID, a.Name, a.Type, a.Cost
from
#tbl_Source a
cross join cte b
where
1 = case
when b.NameOperator = 'In' and charindex('!' + a.Name + '!', b.NameValues) > 0 and b.TypeOperator = 'In' and charindex(concat('!', a.Type, '!'), b.TypeValue) > 0 then 1
when b.NameOperator = 'In' and charindex('!' + a.Name + '!', b.NameValues) > 0 and b.TypeOperator = 'Notin' and charindex(concat('!', a.Type, '!'), b.TypeValue) = 0 then 1
when b.NameOperator = 'NotIn' and charindex('!' + a.Name + '!', b.NameValues) = 0 and b.TypeOperator = 'In' and charindex(concat('!', a.Type, '!'), b.TypeValue) > 0 then 1
when b.NameOperator = 'NotIn' and charindex('!' + a.Name + '!', b.NameValues) = 0 and b.TypeOperator = 'NotIn' and charindex(concat('!', a.Type, '!'), b.TypeValue) = 0 then 1
else 0
end
Output:
RuleID Name Type Cost
---------------------------
1 Cole 2 200
1 Ann 2 700
2 Mike 1 500
2 Mike 1 800

Answer 2

You can try this.
SELECT MAX(R_N.RuleID) RuleID, S.Name, S.Type, S.Cost
FROM tbl_Source S
INNER JOIN tbl_Rules R_N ON
(R_N.NameValues <> S.Name and R_N.NameOperator = 'NotIn' )
OR (R_N.NameValues = S.Name and R_N.NameOperator = 'In' )
INNER JOIN tbl_Rules R_S ON
R_S.RuleID = R_N.RuleID AND
(R_S.TypeValue <> S.Type and R_S.TypeOperator = 'NotIn' )
OR (R_S.TypeValue = S.Type and R_S.TypeOperator = 'In' )
GROUP BY
S.Name, S.Type, S.Cost
HAVING
MAX(R_N.NameOperator) = MIN(R_N.NameOperator)
AND MAX(R_S.TypeOperator) = MIN(R_S.TypeOperator)
Result:
RuleID Name Type Cost
----------- -------------------- ----------- -----------
1 Ann 2 700
1 Cole 2 200
2 Mike 1 500
2 Mike 1 800