Table 1: LocID, Prod_ID, Metric_ID, Metric_Data
Table 2: LocID, Metric_ID, Metric_Data
I need a Result Table as:
LocID
Prod_ID
Metric_ID
Metric_Data with the following conditions being met:
When Metric_ID's match, the Metric_Data will be added
When Metric_ID do not match, the relevant Metric_Data will be shown (meaning the one which has value)
Please note only a some common and some different Metric_ID's exist in Table 1 and Table 2.
How do you generate this 3rd table? I have tried all kinds of joins - full, left, right, etc.
EDIT
select
A.LocID,
A.Prod_ID,
B.Metric_ID,
coalesce(C.Metric_Data + D.Metric_Data, C.Metric_Data, D.Metric_Data) Metric_Data
from (
select LocID, Prod_ID from table1 group by LocID, Prod_ID) A
inner join (
select LocID, Metric_ID from table1 group by LocID
union
select LocID, Metric_ID from table2 group by LocID) B on A.LocID = B.LocID
left join table1 C on C.LocID = A.LocID and C.Prod_ID = A.Prod_ID and C.Metric_ID = B.Metric_ID
left join table2 D on D.LocID = A.LocID and D.Metric_ID = B.Metric_ID
Notes:
A: produces all the location and ProdID combinations
B: produces, for each location, all the possible MetricIDs from both tables
C and D: left joins to the data tables to get the Metric Data
Coalesce: returns either C + D, or if one of them is null, return the other
select
coalesce(a.LocID, b.LocID) LocID,
a.Prod_ID,
coalesce(a.Metric_ID, b.Metric_ID) Metric_ID,
coalesce(a.Metric_Data + b.Metric_Data, a.Metric_Data, b.Metric_Data) Metric_Data
from table1 a
full outer join table2 b
on a.LocID = b.LocID and a.Metric_ID = b.Metric_ID
This assumes
You are matching by the tuple (LocID, Metric_ID)
It is possible for either A or B not to have (LocID,Metric_ID) that exists in the other
The result of Metric_Data is either A+B (if both exist), or A or B if only one exists for a (LocID, Metric_ID) combination
Related
I need help on the following SQL query. Let's say we have table_1 with these columns:
number
Customer
list
321
4514
321
2
2
5321
2
5555
If there's a number in the list column, that indicates that is that there is a list of numbers that should refer to that list. Below is a snapshot of how the final table should look. When there's a null value in the customer field it indicates that there is a list, that list number you can find the customers on that list when the number = the list. I need to change the number to make reference to the number the list belongs to.
number
Customer
list
321
4514
321
5321
2
321
5555
2
I've tried with different joins but unsuccessful:
SELECT *
FROM table_1
OUTER JOIN
(SELECT *
FROM TABLE_1
WHERE list IS NOT NULL) AS table_2 ON TABLE_1.list = table_2.list
You say that this is guaranteed to be one level only. So you can have 321->2, but not, say, 321->2->1.
Then, well, let's join and show the joined result:
select
coalesce(ref.number, t1.number) as num,
t1.customer,
ref.list
from table_1 t1
left outer join table_1 ref on ref.list = t1.number
where t1.list is null;
I guess you need to change the data (DML). Here us an example:
DROP TABLE IF EXISTS customer_list
CREATE TABLE customer_list (
number INT,
Customer INT,
list INT
);
INSERT INTO customer_list (number, Customer, list)
VALUES
(321, 4514, NULL),
(321, NULL, 2),
(2, 5321, NULL),
(2, 5555, NULL);
UPDATE A
SET [number] = B.number
,[list] = b.list
FROM customer_list A
INNER JOIN customer_list B
ON A.number = B.list
WHERE B.Customer IS NULL
DELETE FROM customer_list
WHERE Customer IS NULL;
SELECT *
FROM customer_list
If you need only to get the records:
SELECT B.number
,A.customer
,B.List
FROM customer_list A
INNER JOIN customer_list B
ON A.number = B.list
WHERE B.Customer IS NULL
In my query below, I joined tables b, c, d to a by the base_id column.
However, I need to do some operations in my SELECT statement.
Since b, c, and d are not joined to each other,
is my (a.qty - (b.qty - (c.qty + d.qty))) formula computing only those tables that have the same base_id column?
SELECT (a.qty - (b.qty - (c.qty + d.qty))) AS qc_in
FROM receiving a
LEFT JOIN (
SELECT SUM(qty) AS qty, base_id
FROM quality_control bb
WHERE location_to = 6
AND is_canceled = 0
GROUP BY base_id
) b
ON b.base_id = a.base_id
LEFT JOIN (
SELECT SUM(qty) AS qty, base_id
FROM quality_control ba
WHERE location_from = 6
AND is_canceled = 0
GROUP BY base_id
) c
ON c.base_id = a.base_id
LEFT JOIN (
SELECT SUM(qty) AS qty, base_id
FROM issuance
WHERE location_from = 6
AND is_canceled = 0
GROUP BY base_id
) d
ON d.base_id = a.base_id
WHERE a.is_canceled = 0
I think you're confused by how joining works (if I'm reading the question correctly). If you have:
select *
from table1 a
join table2 b
on a.Id = b.Id
join table3c
on a.Id = c.Id
Then yes a is joined to b, and b is joined to c, but that also means that a is joined to c. One way to think of it is as one giant in-memory table that has all of the a columns then all of the b columns and then all of the c columns in the one result.
If a.Id is 1, and you select the row from b where Id is the same (1) and then you join to c where the Id is the same as a (1), then a, b and c all have the same id.
So yes, (a.qty - (b.qty - (c.qty + d.qty))) will only be doing that calculation for rows where a, b, c and d all have the same base_id .
Surely. In the nested statements you join all the tables on base_id. That means, as the result of those joins you will get a huge table containing columns from all of the joined tables with a common column you join on (base_id in your case).
I'm having some hard time doing the join function on those two tables. I have simplified the example dataset as there are additional where-clauses involved for the first table however that doesn't seem to be a problem.
I would write the query for joining the two tables below:
select a.prod_code, a.prod_name, b.ref_value from Product_code a
left join Product_reference b on a.prod_code = b.pref_code
where a.prod_code <> 'CURTAIN' and b.ref_value = 'MAN'
The problem I'm facing is that I want to join tables kind of conditionally. I.e. if the ref_type value is 'MAN' in Product_reference table, I do want to join it, otherwise not.
For an example this query would not include "Chair" in the result as it does not have an ref_type 'MAN' available in the "Product_name". What I'd need though is still show it in the query result, just without joined value from the Product_reference table (given that value with ref_type 'MAN' does not exist for it), not leave it out altogether.
Meanwhile Product_name table record 'CURTAIN' should be left off (regardless if Product_reference ref_type 'MAN' exists or not)
Any recommendations?
Product_code
prod_code prod_name
A Table
B Chair
C Window
D Door
E Curtain
Product_reference
pref_code ref_type ref_value
A MAN x
A AUTO y
B AUTO z
C AUTO z1
C MAN x1
D AUTO zxc
E AUTO abc
E MAN cba
Move b.ref_value = 'MAN' to the join predicate:
SELECT a.prod_code, a.prod_name, b.ref_value
FROM Product_code a
LEFT JOIN Product_reference b ON a.prod_code = b.pref_code AND b.ref_value = 'MAN'
WHERE a.prod_code <> 'CURTAIN'
This will accomplish what you want, which is only left joining the data from table b where b.ref_value = 'MAN', instead of removing all other rows from the result set altogether.
Side note, thanks for including your query and sample data in your very well made question. We appreciate it.
you could use a inner join on the distinct product that have 'MAN'
select
a.prod_code
, a.prod_name
, b.ref_value
from Product_code a
inner join (
select distinct pref_code
from Product_reference
where ref_type = 'MAN') t2 on t2.pref_code = a.prod_code
and a.prod_code <> 'CURTAIN'
I have below query
SELECT Vehicle_ID,Total_Weight,date,bilty_No FROM harvesting
UNION
SELECT Vehicle_ID,Total_Weight,date,Bilty_No FROM Blade_Harvesting
Now i want to show vehicle_name instead of vehicle_ID from vehicle table..
how can i add vehicle table and show name instead of ID?
Here we union your tables as before, aliasing the result as "h", and join onto your vehicle table. This assumes your vehicle table has columns "id" and "vehicle_name". Note that any Vehicle_IDs not present in both the vehicle table and the harvesting table will be omitted from the results, as this is an inner join. To show all vehicles, change "inner join" to "left join". This tells the database to retain everything in your vehicle table, and return NULL values from your harvesting table where there is no corresponding harvesting data.
Select v.vehicle_name, h.Total_Weight, h.date, h.bilty_No
from
vehicle_table v
inner join
(
SELECT Vehicle_ID,Total_Weight,date,bilty_No FROM harvesting
UNION
SELECT Vehicle_ID,Total_Weight,date,Bilty_No FROM Blade_Harvesting
) h
on h.Vehicle_ID = v.id
Try this query --
SELECT Vehicle_Name
,Total_Weight
,DATE
,bilty_No
FROM harvesting H
INNER JOIN Vehicle V
ON H.Vehicle_ID = V.Vehicle_ID
UNION
SELECT Vehicle_Name
,Total_Weight
,DATE
,Bilty_No
FROM Blade_Harvesting BH
INNER JOIN Vehicle V
ON BH.Vehicle_ID = V.Vehicle_ID
I have a table with 3 columns: Code, Year, percentage.
I need to return the code with the lowest (minimal) percentage in 2009. After this, I want also the name of the code, that exsist in other table that I made.
I only think using CREATE VIEW, but I prefer not to do so.
Select table.code, table.year, table.percentage, othertable.name
from table
inner join othertable on table.FKId = othertable.PKid
where year = 2009
and percentage =
(select min(percentage)
from table
where year = 2009)
Updated to include the othertable... since we don't have names.
UPDATED
Now that we have table names... Updated 3rd time now that I know year is string.
Select E.Code, C.Name
From dbo.Exam E
inner join dbo.Course C
ON E.Code = C.Code
Where E.Year = '2009' and --<-- PROBLEM LIKELY HERE year was string not int.
E.Fail = (select MIN(E2.Fail)
from dbo.Exam E2 where E2.Year = '2009') --<--Don't forget here too.
From comments: sample Data:
INSERT INTO Exam VALUES(333,'2009',40)
INSERT INTO Exam VALUES(333,'2009',20)
INSERT INTO Exam VALUES(555,'2009',19)
INSERT INTO Exam VALUES(444,'2009',19)
INSERT INTO Exam VALUES(777,'2009',23)
INSERT INTO Exam VALUES(333,'2009',0)
INSERT INTO Course VALUES(111,'Name1',5)
INSERT INTO Course VALUES(333,'Name2',5)
INSERT INTO Course VALUES(444,'Name3',6)
INSERT INTO Course VALUES(555,'Name4',3)
INSERT INTO Course VALUES(777,'Name5',3)
INSERT INTO Course VALUES(999,'Name6',6)
Assumption is result should be
Name2, 5
You can use a group by to find the lowest percentage for a year, and then join back to the main tables to find the corresponding other columns:
select *
from CodeYearPercTbl cyp
join CodeTbl c
on c.Code = cyp.Code
join (
select Year
, min(Percentage) as MinPerc
from CodeYearPercTbl
group by
Year
) as filter
on filter.Year = cyp.Year
and filter.MinPerc = cyp.Percentage
where cyp.Year = 2009
Table-1 : Code,Year,Percentage
Table-2 : Code,CodeName
select T1.Code,T2.CodeName,T1.Percentage from
(
select TOP 1 Code,Percentage
from Table-1
where Year = '2009'
order by Percentage asc
) T1 inner join Table-2 T2 on T1.Code = T2.Code
Try this:
select a.Code, c.Name
from YourTable a inner join AnotherTable c on a.Code = c.Code
where a.Percentage = (select MIN(Percentage)
from YourTable b where b.Year = '2009'
)