Split comma separated values based on another table - sql

Question

I would like to split comma separated values based on another table
I cannot normalize it since original table has over 8 million rows. It crushed my laptop when I tried it.
How can I put data into relevant columns and create a new column if data is not found.
For example:
TableA,
Type1 Type2
---------------------
A F
B G
C H
D I
E NULL
TableB
ID Country AllTypes
---------------------------------
1 Italy A, B, C
2 USA D, E, A, F
4 Japan I, O, Z
5 UK NULL
By using these two tables, I would like to get the output such as
ID Country AllTypes Type1 Type2 UnCaptured
----------------------------------------------------------------------
1 Italy A, B, C A, B, C NULL NULL
2 USA D, E, G, F D, E G, F NULL
4 Japan I, O, Z NULL I O, Z
5 UK NULL NULL NULL NULL
This is I have done so far
with TableA as (
select 'A' as Type1, 'F' as Type2 union all
select 'B', 'G' union all
select 'C', 'H' union all
select 'D', 'I' union all
select 'E', NULL
),
TableB as (
select 1 as ID, 'Italy' as Country, 'A, B, C' as Alltypes union all
select 2, 'USA', 'D, E, A, F' union all
select 4, 'Japan', 'I', 'O', 'Z' union all
select 5, 'UK', NULL
)
select b.Id, b.Country, b.Alltypes,
String_Agg(v.type1,',') Type1,
String_Agg(v.type2,',') Type2
**String_Agg(v.Type3,',') Uncaptured*** ------- This query
from tableb b
outer apply (
select Trim(value) t,
case when exists
(select * from tablea a where a.type1=Trim(value))
then Trim(value) end type1,
case when exists
(select * from tablea a where a.type2=Trim(value))
then Trim(value) end Type2,
Case when not exists ------------This query
( (select * from tablea a where a.type1=Trim(value)) -------
and ------
(select * from tablea a where a.type2=Trim(value))------
) then Trim(value) end Type3** -------------
from String_Split(alltypes, ',')
)v
group by Id, Country, AllTypes
Without highlighted queries(-----) which are for creating a new column (Uncaptured), it works ok like below.
Id Country Alltypes Type1 Type2
1 Italy A, B, C A,B,C NULL
2 USA D, E, A, F D,E,A F
4 Japan I, O, Z I NULL
5 UK NULL NULL NULL
But if I add those highlighted queries, it shows error. I was also thinking of else but did not work as well.
Could someone help me please?

Answer 1

----------------------- DDL+DML: Should have been provided by the OP !
DROP TABLE IF EXISTS TableA,TableB
GO
create table TableA(Type1 CHAR(1), Type2 char(1))
GO
INSERT TableA (Type1,Type2) VALUES
('A', 'F' ),
('B', 'G' ),
('C', 'H' ),
('D', 'I' ),
('E', NULL )
GO
CREATE TABLE TableB (ID INT, Country NVARCHAR(100), AllTypes NVARCHAR(100))
GO
INSERT TableB (ID,Country,AllTypes)VALUES
(1, 'Italy','A, B, C' ),
(2, 'USA ','D, E, G, F' ),
(4, 'Japan','I, O, Z' ),
(5, 'UK ','NULL' )
GO
----------------------- Solution
;WITH MyCTE AS (
SELECT ID,Country,AllTypes, MyType = TRIM([value])
FROM TableB
CROSS APPLY string_split(AllTypes,',')
)
,MyCTE02 as (
SELECT ID,Country,AllTypes, MyType,a1.Type1,a2.Type2,
UnCaptured = CASE WHEN a1.Type1 IS NULL and a2.Type2 IS NULL THEN MyType END
FROM MyCTE c
LEFT JOIN TableA a1 ON c.MyType = a1.Type1
LEFT JOIN TableA a2 ON c.MyType = a2.Type2
)
SELECT ID,Country,AllTypes--,MyType
,Type1 = STRING_AGG(Type1,','),Type2 = STRING_AGG(Type2,','),UnCaptured = STRING_AGG(UnCaptured,',')
FROM MyCTE02
GROUP BY ID,Country,AllTypes
GO

Answer 2

How about
outer apply (
select Trim(value) t, a1.type1, a2.type2,
CASE WHEN COALESCE(a1.type1, a2.type2) IS NULL THEN Trim(s.value) END unCaptured
from String_Split(alltypes, ',') s
left join tablea a1 where a1.type1=Trim(s.value)
left join tablea a2 where a2.type2=Trim(s.value)
)v