How to insert values into the following table by incrementing the date column by 1 day for the next 23 days? - sql

Question

I am using SQL Server 2014. I have a table names T1 (extract shown below):
Company ReviewDate Rank Type Reviews
...
A 2020-10-12 8 Hotel 675
B 2020-10-12 10 Hotel 450
C 2020-10-12 21 Hotel 89
D 2020-10-12 60 Hotel 1200
A 2020-10-13 5 Hotel 688
B 2020-10-13 10 Hotel 500
C 2020-10-13 21 Hotel 89
D 2020-10-13 60 Hotel 1200
I need to update table T1 for period 2020-10-13 to 2020-11-04 with the following logic: All rows to be appended to the table will have the same values as those for ReviewDate on 2020-10-12 except the ReviewDate which will increment by 1 day until 2020-11-04 is reached.
So here is an extract of how the final table will look like (only appended ReviewDate 2020-10-13 shown:
Company ReviewDate Rank Type Reviews
...
A 2020-10-11 8 Hotel 675
B 2020-10-11 10 Hotel 450
C 2020-10-11 21 Hotel 89
D 2020-10-11 60 Hotel 1200
A 2020-10-12 5 Hotel 688
B 2020-10-12 10 Hotel 500
C 2020-10-12 21 Hotel 89
D 2020-10-12 60 Hotel 1200
A 2020-10-13 5 Hotel 688
B 2020-10-13 10 Hotel 500
C 2020-10-13 21 Hotel 89
D 2020-10-13 60 Hotel 1200
...
NOTE: the table also contain entries with ReviewDate before 2020-10-12 but I just need to insert values into the table for a specific period with data related to 2020-10-12
How can I do that with a T-SQL query?

Answer 1

You need to insert rows. One method is to cross join to the dates you want and use that:
insert into t1 (Company, ReviewDate, Rank, Type, Reviews)
select t1.Company, v.date, t1.Rank, t1.Type, t1.Reviews
from t1 cross join
(values ('2020-10-13'), ('2020-10-14'), . . .
) v(date
where t1.reviewdate = '2020-10-12';
There are other ways to create the dates. One method is a recursive CTE:
with dates as (
select convert(date, '2020-10-13') as dte
union all
select dateadd(day, 1, dte)
from dates
where dte < '2020-11-04'
)
select . . .
from t1 cross join
dates d;

Answer 2

Try this code.
DECLARE #TABLE TABLE (
COMPANY VARCHAR(1),
ReviewDate Date,
[Rank] int
)
INSERT INTO #TABLE VALUES ('A','2020-10-11',5)
INSERT INTO #TABLE VALUES ('B','2020-10-11',10)
INSERT INTO #TABLE VALUES ('C','2020-10-11',21)
INSERT INTO #TABLE VALUES ('D','2020-10-11',60)
;WITH CTE AS (
SELECT * FROM #TABLE
UNION ALL
SELECT
COMPANY,
dateadd(day,1,ReviewDate),
[Rank]
from CTE
WHERE ReviewDate <= '2020-10-13'
)
SELECT * FROM CTE
ORDER BY 2,1