Filling missing rows , RIGHT JOIN with each group of GROUP BY - sql-server

Question

On one table I have Id, and Name of 10 tests whitch should be done.
On second SN product, TestDate, and Id test that have been done to this product.
I need to find, and show tests whitch should be done but they are not.
Solution with CROSS JOIN, and LEFT OUTER JOIN works for 1000 rows, but for 8000-15000 it takes a long time 1-3 minutes.
Data are prepared by CTE query
example below
I want to add "missing" row to each group #Table2
#Table1 => four tests which should be done
number - Id of test
data3 -name of test
#Table2 => tests which were done
data1 - id of tested device
GROUP => tests of one device
DECLARE #table1 TABLE (data3 NVARCHAR(20), number INT)
DECLARE #table2 TABLE (data1 NVARCHAR(20), data2 NVARCHAR(20), number INT)
INSERT INTO #table1
SELECT 'xx', 1
UNION ALL
SELECT 'ee', 2
UNION ALL
SELECT 'zz', 3
UNION ALL
SELECT 'gg', 4
INSERT INTO #table2
SELECT '1', 'aaaaaaaaaa', 1 --GROUP 1
UNION ALL
SELECT '1', 'aaaaaaaaaa', 2 --GROUP 1
UNION ALL
SELECT '1', 'aaaaaaaaaa', 3 --GROUP 1
UNION ALL
SELECT '2', 'bbbbbbbbbb', 1 --GROUP 2
UNION ALL
SELECT '2', 'bbbbbbbbbb', 2 --GROUP 2
UNION ALL
SELECT '3', 'cccccccccc', 1 --GROUP 3
UNION ALL
SELECT '3', 'cccccccccc', 3 --GROUP 3
With this query only one row was added (first one), I need to fill each group of table2
If my group is eg. GROUP BY data1,data2
SELECT *
FROM #table2 t2
RIGHT JOIN #table1 t1 ON t2.number = t1.number
ORDER BY t2.data1, t1.number
Output:
data1 data2 number data3 number
-----------------------------------------
NULL NULL NULL gg 4
1 aaaaaaaaaa 1 xx 1
1 aaaaaaaaaa 2 ee 2
1 aaaaaaaaaa 3 zz 3
2 bbbbbbbbbb 1 xx 1
2 bbbbbbbbbb 2 ee 2
3 cccccccccc 3 zz 3
3 cccccccccc 1 xx 1
This is my required output (although only one 'number' column would also work)
data1 data2 number number3
-----------------------------------------
1 aaaaaaaaaa 1 1 --GROUP 1
1 aaaaaaaaaa 2 2 --GROUP 1
1 aaaaaaaaaa 3 3 --GROUP 1
NULL NULL NULL 4 --GROUP 1
2 bbbbbbbbbb 1 1 --GROUP 2
2 bbbbbbbbbb 2 2 --GROUP 2
NULL NULL NULL 3 --GROUP 2
NULL NULL NULL 4 --GROUP 2
3 cccccccccc 1 1 --GROUP 3
NULL NULL NULL 2 --GROUP 3
3 cccccccccc 3 3 --GROUP 3
NULL NULL NULL 4 --GROUP 3

Answer 1

Why your data1 are null for missing values? I guess they must be filled from table2. Try this query:
;with cte as (
select
distinct a.data1, b.number, b.data3
from
#table2 a
cross join #table1 b
)
select
c.data1, t.data2, t.number, c.data3, number3 = c.number
from
cte c
left join #table2 t on c.data1 = t.data1 and c.number = t.number
Output
data1 data2 number data3 number3
---------------------------------------------
1 aaaaaaaaaa 1 xx 1
1 aaaaaaaaaa 2 ee 2
1 aaaaaaaaaa 3 zz 3
1 NULL NULL gg 4
2 bbbbbbbbbb 1 xx 1
2 bbbbbbbbbb 2 ee 2
2 NULL NULL zz 3
2 NULL NULL gg 4
3 cccccccccc 1 xx 1
3 NULL NULL ee 2
3 cccccccccc 3 zz 3
3 NULL NULL gg 4
If you really need to show null values in data1 column, then add case statement to check value of data2.