SQL: Join two tables by date range and group by year - mysql

Question

I want to join two tables:
Table1:
Task
Hours
Client
Time
Task A
1
Client A
2023-01-01
Task A
2
Client A
2022-03-04
Task A
3
Client A
2023-01-01
Task A
4
Client A
2022-03-04
Task B
5
Client A
2023-01-01
Task B
6
Client A
2022-03-04
Task B
7
Client A
2023-01-01
Task B
8
Client A
2022-03-04
Table 2:
Task
Time Budget
Client
Start Range
End Range
Task A
50
Client A
2023-01-01
2023-12-31
Task A
60
Client A
2022-01-01
2022-12-31
Task B
80
Client A
2023-01-01
2023-12-31
Task B
70
Client A
2022-01-01
2022-12-31
I want to get such a table:
Task
Time Budget
Client
Start Range
End Range
Time spent
Task A
50
Client A
2023-01-01
2023-12-31
4
Task A
60
Client A
2022-01-01
2022-12-31
6
Task B
80
Client A
2023-01-01
2023-12-31
12
Task B
70
Client A
2022-01-01
2022-12-31
14
What I tried:
SELECT
t2.task as task,
t2.budget as budget,
t1.client as client,
t2.from_date as start_range,
t2.to_date as end_range,
sum(t1.hours) AS time_spent,
FROM `Table1` t1
LEFT JOIN
`Table2` t2
ON t1.task = t2.task
AND t1.client = t2.client
AND date(t1.time) BETWEEN t2.start_range and t2.end_range
Group by
task, client, start_range, end_range
However, this does not work. The best I can get is where it is joined, but for example the whole year 2022 is ignored.
Any help is so much appreciated!
With this query (and the suggested one) it leads to:
Task
Time Budget
Client
Start Range
End Range
Time spent
Task A
50
Client A
2023-01-01
2023-12-31
4
Task A
60
NULL
2022-01-01
2022-12-31
NULL
Task B
80
Client A
2023-01-01
2023-12-31
12
Task B
70
NULL
2022-01-01
2022-12-31
NULL

Answer 1

The t2.budget is not included in the group by and you need to sum by the hour column.
If you want to include all of the table2 results, start with this table, then left join table1. Here is a post about table joins.
Using https://www.db-fiddle.com/
Schema (MySQL v5.7)
CREATE TABLE Table1 (
`Task` VARCHAR(6),
`Hours` INTEGER,
`Client` VARCHAR(8),
`Time` DATE
);
INSERT INTO Table1
(`Task`, `Hours`, `Client`, `Time`)
VALUES
('Task A', '1', 'Client A', '2023-01-01'),
('Task A', '2', 'Client A', '2022-03-04'),
('Task A', '3', 'Client A', '2023-01-01'),
('Task A', '4', 'Client A', '2022-03-04'),
('Task B', '5', 'Client A', '2023-01-01'),
('Task B', '6', 'Client A', '2022-03-04'),
('Task B', '7', 'Client A', '2023-01-01'),
('Task B', '8', 'Client A', '2022-03-04');
CREATE TABLE Table2 (
`Task` VARCHAR(6),
`Time Budget` INTEGER,
`Client` VARCHAR(8),
`Start Range` DATE,
`End Range` DATE
);
INSERT INTO Table2
(`Task`, `Time Budget`, `Client`, `Start Range`, `End Range`)
VALUES
('Task A', '50', 'Client A', '2023-01-01', '2023-12-31'),
('Task A', '60', 'Client A', '2022-01-01', '2022-12-31'),
('Task B', '80', 'Client A', '2023-01-01', '2023-12-31'),
('Task B', '70', 'Client A', '2022-01-01', '2022-12-31');
Query #1
SELECT
t2.`task`,
t2.`Time Budget`,
t2.client,
t2.`Start Range`,
t2.`End Range`,
SUM(t1.hours)
FROM Table2 AS t2
LEFT JOIN Table1 AS t1
ON t2.Task=t1.task
AND t2.client=t1.client
AND t1.time between t2.`Start Range` AND t2.`End Range`
GROUP BY 1,2,3,4,5;
task
Time Budget
client
Start Range
End Range
SUM(t1.hours)
Task A
50
Client A
2023-01-01
2023-12-31
4
Task A
60
Client A
2022-01-01
2022-12-31
6
Task B
70
Client A
2022-01-01
2022-12-31
14
Task B
80
Client A
2023-01-01
2023-12-31
12
View on DB Fiddle

Answer 2

Try to use UNION and WHERE to fetch data from 2 SELECT:
Select * from
(Select a as a1
UNION
Select b as b1)
WHERE b1=a1