SQL Statement with 3 select statements - sql

Question

I am trying to combine the data of three tables but running into a minor issue.
Let's say we have 3 tables
Table A
ID | ID2 | ID3 | Name | Age
1 2x 4y John 23
2 7j Mike 27
3 1S1 6HH Steve 67
4 45 O8 Carol 56
Table B
| ID2 | ID3 | Price
2x 4y 23
7j 8uj 27
x4 Q6 56
Table C
|ID | Weight|
1 145
1 210
1 240
2 234
2 110
3 260
3 210
4 82
I want to get every record from table A of everyone who weighs 200 or more but they cannot be in table B. Table A and C are joined by ID. Table A and B are joined by either ID2 or ID3. ID2 and ID3 don't both have to necessarily be populated but at least 1 will. Either can be present or both and they will be unique. So expected result is
3 | 1S1 | 6HH | Steve| 67
Note that a person can have multiple weights but as long as at least one record is 200 or above they get pulled.
What I have so far
Select *
From tableA x
Where
x.id in (Select distinct y.id
From tableA y, tableC z
Where y.id = z.id
And z.weight >= '200'
And y.id not in (Select distinct h.id
From tableA h, tableB k
Where (h.id2 = k.id2 or h.id3 = k.id3)))
When I do this it seems to ignore the check on tableB and I get John, Mike and Steve. Any ideas? Sorry it's convoluted, this is what I have to work with. I am doing this in oracle by the way.

Answer 1

This sounds like exists and not exists. So a direct translation is:
select a.*
from tableA a
where exists (select 1 from tableC c where c.id = a.id and c.weight >= 200) and
not exists (select 1 from tableB b where b.id2 = a.id2 or b.id3 = a.id3);
Splitting the or into two separate subqueries can often improve performance:
select a.*
from tableA a
where exists (select 1 from tableC c where c.id = a.id and c.weight >= 200) and
not exists (select 1 from tableB b where b.id2 = a.id2) and
not exists (select 1 from tableB b where b.id3 = a.id3);

Answer 2

Here's what I came up with.
SELECT DISTINCT
A.ID,
A.ID2,
A.ID3,
A.Name,
A.Age
FROM
A
LEFT OUTER JOIN C ON C.ID = A.ID
LEFT OUTER JOIN B ON
B.ID2 = A.ID2
OR B.ID3 = A.ID3
WHERE
C.Weight >= 200
AND B.Price IS NULL
BELOW is test data
CREATE TABLE A
(
ID INT,
ID2 VARCHAR(3),
ID3 VARCHAR(3),
Name VARCHAR(10),
Age INT
);
INSERT INTO A VALUES (1, '2x', '4y', 'John', 23);
INSERT INTO A VALUES (2, '7j', NULL , 'Mike', 27);
INSERT INTO A VALUES (3, '1S1', '6HH', 'Steve', 67);
INSERT INTO A VALUES (4, '45', 'O8', 'Carol', 56);
CREATE TABLE B
(
ID2 VARCHAR(3),
ID3 VARCHAR(3),
Price INT
);
INSERT INTO B VALUES ('2x', '4y', 23);
INSERT INTO B VALUES ('7j', '8uj', 27);
INSERT INTO B VALUES ('x4', 'Q6', 56);
CREATE TABLE C
(
ID INT,
Weight INT
);
INSERT INTO C VALUES (1, 145);
INSERT INTO C VALUES (1, 210);
INSERT INTO C VALUES (1, 240);
INSERT INTO C VALUES (2, 234);
INSERT INTO C VALUES (2, 110);
INSERT INTO C VALUES (3, 260);
INSERT INTO C VALUES (3, 210);
INSERT INTO C VALUES (4, 82);

Answer 3

Select a.id, a.id2, a.id3
From table_a a
Left join table_c c on a.id = c.id
Where c.weight >=200
And not exists
(Select 1
From table_b b
Where a.id = b.id2
Or a.id = b.id3
);

Answer 4

I was beating to the answers, but I used INNER JOIN on tables a and c and a NOT EXISTS on table b.
--This first section is creating the test data
with Table_A (id, id2, id3, Name, age) as
(select 1, '2x', '4y', 'John', 23 from dual union all
select 2, '7j', null, 'Mike', 27 from dual union all
select 3, '1S1', '6HH', 'Steve', 67 from dual union all
select 4, '45', 'O8', 'Carol', 56 from dual),
Table_B(id2, id3, price) as
(select '2x', '4y', 23 from dual union all
select '7j', '8uj', 27 from dual union all
select 'x4', 'Q6', 56 from dual),
Table_C(id, weight) as
(select 1, 145 from dual union all
select 1, 210 from dual union all
select 1, 240 from dual union all
select 2, 234 from dual union all
select 2, 110 from dual union all
select 3, 260 from dual union all
select 3, 210 from dual union all
select 4, 82 from dual)
--Actual query starts here
select distinct a.*
from table_a a
--join to table c, include the weight filter
inner join table_c c on (a.id = c.id and c.weight >= 200)
where not exists -- The rest is the NOT EXISTS to exclude the values in table b
(select 1 from table_b b
where a.id2 = b.id2
or a.id3 = b.id3);