Question

I want to run a T-SQL script where I create a temp table that will be aggregated by a certain field of another table, call it table X. The remaining fields of this temp table will be populated by performing aggregate functions on the fields of table X. Then I would like to do a MERGE / WHEN MATCHED with my temp table on a different table (call it table Y) after I have populated the temp table.

How do I create this temp table and populate it with aggregate functions? (I have already coded the MERGE part of the problem).

Answer 1

to create a temp table you will can do the following:

create table #temp
(
    id int,
    col1 int
)

then you will write an INSERT INTO

INSERT INTO #temp
SELECT col1, sum(col2)
FROM yourTable

Once you have created your temp table you can use it in your store procedure.