How to pull consecutive months data in sql server even if there is null value - sql-server

Question

I'm newbie trying to create a SQL query to find how much each Theater has sold the tickets per month during previous year (i.e. for all 12 months). If the collection amount is null or blank I need to produce an output as Zero of any such given month in that year.
I have two tables as below mentioned:
TABLE 1:
Month_Number Year
1 2016
2 2016
3 2016
4 2016
5 2016
6 2016
7 2016
8 2016
9 2016
10 2016
11 2016
12 2016
TABLE 2:
Theater month Amount_In_Thousands
ABC 1 165
ABC 3 70
ABC 4 102
GHI 1 45
GHI 2 70
GHI 3 42
GHI 4 57
ABC 6 122
ABC 7 67
ABC 8 22
ABC 9 80
ABC 11 46
ABC 12 38
You might have noticed for 'ABC' Theater there is 0 or null values for month 2, month 5 and month 10. I am unable to produce these missing months with zero value. I tried with simple left outer join but still the data output row doesn't show with month/year and zero value.
I need to produce the output as below:
OUTPUT
Movie_Theators Month Amount_In_Thounds
ABC 1 165
ABC 2 0 *
ABC 3 70
ABC 4 102
ABC 5 0 *
ABC 6 122
ABC 7 67
ABC 8 22
ABC 9 80
ABC 10 0 *
ABC 11 46
ABC 12 38
GHI 1 45
GHI 2 70
GHI 3 42
GHI 4 57
Can anybody please help me how to write sql script in order to produce the output as shown above. Thank you so much in advance.

Answer 1

You can use a CROSS JOIN between every theater and month-year, and then perform a LEFT JOIN with Table2:
SELECT A.Theater,
B.Month_Number,
B.[Year],
ISNULL(C.Amount_In_Thousands,0) Amount_In_Thousands
FROM ( SELECT DISTINCT Theater
FROM dbo.Table2) A -- or use a dbo.Theater table if you have one
CROSS JOIN dbo.Table1 B
LEFT JOIN dbo.Table2 C
ON A.Theater = C.Theater
AND B.Month_Number = C.[month]
AND B.[Year] = C.[Year];