"根据另一个表拆分逗号分隔值"

Question

我想根据另一个表拆分逗号分隔值

我无法对其进行规范化，因为原始表有超过 800 万行。 当我尝试它时，它压碎了我的笔记本电脑。

如果找不到数据，如何将数据放入相关列并创建新列。

例如：

表A，

Type1        Type2
---------------------
 A            F         
 B            G
 C            H
 D            I
 E           NULL

Answer 1

怎么样

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

Answer 2

----------------------- 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