sql in excel vba - child parent subquery

Question

I am trying to select only rows from the INPUT table which do not have a child - in SQL.The result is in OUTPUT. To make it easier, for now, I am considering only the columns 5H and 6H (the other columns I will do later after I have figured how the code needs to be written). The first part of the code before UNION - inserts only rows which have all columns - 1H thru 6H. Then the second part, after UNION, should make sure that only the columns where 5H is not NULL and 6H is null and which do not have a child in 6H, will be included. But it does not work. (NAME5 appears in the OUTPUT - but NAME5 is a parent for the child NAME6).

The embedded JOIN has this: WHERE v1.[5H] <> v2.[5H] -- to make sure that the row which is a parent will be excluded (i.e. v1.[5H] already exists in OUTPUT for a child row). But something goes wrong. Any idea why? Thank you for your help.

I am working in Excel - vba. I was having problems to copy the code in a readable format - hence I am enclosing the code as a picture as well

What I do not understand, why the issue is with: NAME5 is in output and it should not be there, because its child NAME6 is in OUTPUT. But here it works: the child NAME17 is in OUTPUT but its parent NAME16 is not in the OUTPUT (which is correct). Or NAME2 and NAME3 ... it is correct

the code is:

SQLQuery = _  
"SELECT  v1.[name], v1.[1H], v1.[2H], v1.[3H], v1.[4H], v1.[5H], v1.[6H]" & _
    " FROM [INPUT$] as v1 WHERE  v1.[2H] IS NOT NULL and " & _
    " v1.[3H] IS NOT NULL AND v1.[4H] IS NOT NULL AND v1.[5H] IS NOT NULL AND v1.[6H] IS NOT NULL " & _
"UNION " & _
"SELECT DISTINCT  v1.[name], v1.[1H], v1.[2H], v1.[3H], v1.[4H], v1.[5H], v1.[6H]" & _
    " FROM [INPUT$] as v1  " & _
    " INNER JOIN  " & _
    " (SELECT  * " & _
        " FROM [INPUT$] WHERE [5H] IS NOT NULL AND  [6H] IS NULL )  as v2  " & _
        " ON v1.[1H] = v2.[1H] and v1.[2H] = v2.[2H] and v1.[3H] = v2.[3H] and v1.[4H] = v2.[4H]  " & _
        " WHERE v1.[5H] <> v2.[5H]  "

Here is a SQL-Server fiddle that examins the source for the record with name=NAME5 dbfiddle.uk/4gIH98Tr — Bart McEndree
– Bart McEndree, Commented Dec 20, 2024 at 15:39
name22 - will go to the OUTPUT as well. But this is in 4H (currently I am solving the issue for 5H and 6H) - when the code is clear here, certainly, NAME22 (column 4H) and other columns towards V1 will be included in the code — Peter
– Peter, Commented Dec 20, 2024 at 22:07

Bart McEndree · Accepted Answer · 2024-12-20 16:40:53Z

0

The record with name=Name5 is included because the 2nd query (after the union) allows it.

...    
UNION
    "SELECT DISTINCT  v1.[name], v1.[1H], v1.[2H], v1.[3H], v1.[4H], v1.[5H], v1.[6H]" & _
        " FROM [INPUT$] as v1  " & _
        " INNER JOIN  " & _
        " (SELECT  * " & _
            " FROM [INPUT$] WHERE [5H] IS NOT NULL AND  [6H] IS NULL )  as v2  " & _
            " ON v1.[1H] = v2.[1H] and v1.[2H] = v2.[2H] and v1.[3H] = v2.[3H] and v1.[4H] = v2.[4H]  " & _
            " WHERE v1.[5H] <> v2.[5H]  "

If you examine the values from v2.5H you can see 3 values that satisfy the join criteria

ON v1.[1H] = v2.[1H] and v1.[2H] = v2.[2H] and v1.[3H] = v2.[3H] and v1.[4H] = v2.[4H]

and WHERE clause.

WHERE v1.[5H] <> v2.[5H]

name	1H	2H	3H	4H	5H	v2.5H	6H
NAME19	1	1	1	2	2	1,3,4	null
NAME20	1	1	1	2	3	1,2,4	null
NAME21	1	1	1	2	4	1,2	null
NAME5	1	1	1	2	1	2,3,4	null
NAME6	1	1	1	2	1	2,3,4	1

edited Dec 20, 2024 at 16:40

answered Dec 20, 2024 at 15:44

Bart McEndree

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Comments

ValNik · Accepted Answer · 2024-12-20 22:10:28Z

Self JOIN source data to find childs for every row.
If row do not have child - this is target row.

There t2 (right side) row is child of t1 (left side) row, if

t1.cname<>t2.cname  -- a row cannot be a parent/child of itself
   and (t1.c1H=t2.c1H or t1.c1H is null) 
   and (t1.c2H=t2.c2H or t1.c2H is null)
   and (t1.c3H=t2.c3H or t1.c3H is null)
   and (t1.c4H=t2.c4H or t1.c4H is null)
   and (t1.c5H=t2.c5H or t1.c5H is null)
   and (t1.c6H=t2.c6H or t1.c6H is null)

There value of child is equal to parent or parent is null
for example:
(1,1) is child of (1,null)
(1,1,2) is child of (1,1,null)
(1,1,2) is not child of (1,1,1)

When obviously (1,1,1,1,1,1) is child of (1,1,1,1,1,null)
Note:
(1,1,1,1,1,1) is child of (1,1,1,1,1,1) - we cannot distinguish who is the parent, who is the child.
(1,1,1,1,1,null) is child of (1,1,1,1,1,null)

If you have those cases check additionally.

See example

cname	c1H	c2H	c3H	c4H	c5H	c6H	comment
name1	1	1	1	1	null	null	no
name2	1	1	1	1	1	null	no
name3	1	1	1	1	1	1	yes
name4	1	1	1	2	null	null	no
name5	1	1	1	2	1	null	no
name6	1	1	1	2	1	1	yes
name19	1	1	1	2	2	null	yes
name20	1	1	1	2	3	null	yes
name21	1	1	1	2	4	null	yes
name22	1	1	1	3	null	null	no/yes?
name7	1	1	1	null	null	null	no
name8	1	1	2	null	null	null	no
name9	1	1	2	1	null	null	no
name10	1	1	2	1	1	null	no
name11	1	1	2	1	1	1	yes
name12	1	1	null	null	null	null	no
name13	1	2	null	null	null	null	no
name14	1	2	1	null	null	null	no
name15	1	2	1	1	null	null	no
name16	1	2	1	1	1	null	no
name17	1	2	1	1	1	1	yes
name18	1	null	null	null	null	null	no

Query

select *
from test t1
left join test t2 
  on  t1.cname<>t2.cname 
   and (t1.c1H=t2.c1H or t1.c1H is null)
   and (t1.c2H=t2.c2H or t1.c2H is null)
   and (t1.c3H=t2.c3H or t1.c3H is null)
   and (t1.c4H=t2.c4H or t1.c4H is null)
   and (t1.c5H=t2.c5H or t1.c5H is null)
   and (t1.c6H=t2.c6H or t1.c6H is null)
where t2.cname is null  -- no childs

Output

cname	c1H	c2H	c3H	c4H	c5H	c6H	comment
name3	1	1	1	1	1	1	yes
name6	1	1	1	2	1	1	yes
name19	1	1	1	2	2	null	yes
name20	1	1	1	2	3	null	yes
name21	1	1	1	2	4	null	yes
name22	1	1	1	3	null	null	no/yes?
name11	1	1	2	1	1	1	yes
name17	1	2	1	1	1	1	yes

For 'name22' in your data, I think this is target row.
Update1. This is solution for all columns, not only 5 and 6.

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