Fetch Date based on another date - sql

Question

Table 1:
Temp ResID Code Date
11 1 SPR
12 1 SPG 2009-10-05
13 1 SPR
14 1 SPG 2011-10-08
Table 2:
TempID Res ID InDate Out Date
21 1. 2009-10-05 2010-11-15
22 1. 2011-10-08 2011-11-09
Table 3: (Desired Result)
ResID Code Date
1 SPR 2010-11-15
1 SPG 2009-10-05
1 SPR 2011-11-09
1 SPG 2011-10-08
I have two tables as above.
I need to update the Table 1 Date column for every ID for every row where the code is SPR. The SPG value in table 1 date column is equal to InDate column value for the same resident
Please advice with the query. How do I achieve this with a query joining the two tables, table 1 and table 2 to get table 3

Answer 1

Edited from a select statement to an Update
I think this will work for you. See the SqlFiddle
Update
Table1
set
Table1.[Date] = Table2.OutDate
from
Table1
inner join
(
select
Temp,
ResID,
Code,
Date,
row_number() over(partition by ResID order by Temp) as RowId
from
Table1
where
Code = 'SPR'
) as SPR on Table1.Temp = SPR.Temp
inner join
(
select
ResID,
Code,
Date,
row_number() over(partition by ResID order by Temp) as RowId
from
Table1
where
Code = 'SPG'
) as SPG on SPG.RowId = SPR.RowId and SPG.ResID = SPR.ResID
inner join
Table2 on Table2.InDate = SPG.Date and Table2.ResID = SPG.ResID

Answer 2

You could delete all the SPR rows and then generate them:
delete Table1
where code = 'SPR';
insert Table1
(ResID, Code, [Date])
select t1.ResID
, 'SPR'
, OutDate
from Table1 t1
join Table2 t2
on t1.ResID = t2.ResID
and t1.[Date] = t2.InDate
where t1.Code = 'SPG';
Example at SQL Fiddle.

Answer 3

If table2 has value for every table one then you can just use table2, kind of weird but you can always join with the main table to get appropriate result if you want to
select Convert(varchar, indate, 102) as date, 'SPG' as code, resid from table2
union all
select convert(varchar, outdate, 102) as date, 'SPR' as code, resid from table2
SQL Fiddle