SQL insert into using WITH statement throws an unexpected 'insert' error - sql

Question

As part of my SQL query, I first create a table called 'new' based on certain conditions and then insert into the new table some columns from a different table old based on certain conditions. Here's a simplified version of what I am trying to do:
item | subitem | stage | id |
-----------------------------------------------
i1 | s1 | picked | 1 |
i1 | s2 | shipped | 1 |
i2 | s4 | picked | 2 |
i3 | s10 | shipped | 2 |
i3 | s11 | eligible | 0 |
i4 | s2 |not eligible| 0 |
i1 | s1 | picked | 3 |
i1 | s2 | picked | 3 |
I want the output as following:
item1|subitem1|item2|subitem2|pair_volume|item1pick|item1ship|item2pick|item2ship|
-------------------------------------------------------------------------------------
i1 | s1 | i1 | s2 | 2 | 2 | 0 | 2 | 1 |
i1 | s1 | i2 | s4 | 1 |1 | 0 | 1 | 1 |
....
.....
....
Essentially, what I want to do here is the following:
I want to first make a cross-join of item, subitem with itself, so I have all possible combinations of item1, subitem1 and item2, subitem2.
Here's how the stages are defined. If a stage is eligible, then it is just eligible, whereas if a stage is picked, then it means that item is both eligible and picked. If a stage is shipped, then it means that item is eligible, picked and shipped. Only the last stage is mentioned.
Now, for every item1, subitem1 - item2, subitem2 pair, I want to calculate the count of id sessions where this pair occurs and has stage in (eligible, shipped, picked) and populate the value in pair_volume. For eg, (i1,s1)-(i1,s2) pair occurs twice (once in id 1 and once in id 3) and in both these id sessions, both the items in the pair were eligible (which is implied from picked and shipped) stages. Out of the 2 times that this eligible pair occurred, how many times is item1 picked, item2 picked, item1 shipped and item2 shipped? This is what I am trying to solve.
I can do fine until cross join. But I don't know how to insert values into the cross joined table. The real problem is more complex than what I have mentioned here. Any help is much appreciated!
Here's the query I have so far:
with new as
(
select combination.item1, combination.subitem1, combination.item2,
combination.subitem2,
(
select tmp.item1, tmp.subitem1, tmp.item2, tmp.subitem2,
case when ((tmp.item1 = tmp.item2) and
(tmp.subitem1 = tmp.subitem2)) then 'TRUE' else
'FALSE' end as indicator from
(
select distinct item as item1, subitem as subitem2
from old
cross join
select distinct item as item2, subitem as subitem2
from old
) tmp
) combination
where combination.indicator = 'FALSE'
)
insert into new (pair_volume)
select count(id) as pair_volume
from old
where ((new.item1 = old.item) and (new.subitem1 = old.subitem) and
stage
in ('picked', 'eligible', 'shipped')) and
((new.item2 = old.item) and (new.subitem2 = old.subitem) and
stage
in ('picked', 'eligible', 'shipped')
This is essentially what I am trying to do here and the insert into statement keeps throwing error. The part until cross join works fine. But I am having trouble inserting values into the table as well as making the right conditions for the output table I want. Any help is much much appreciated!!
However, this throws an error for me as follows:
SQL compilation error: syntax error line 4 at position 0 unexpected 'insert'.
I tried including a semi colon before the insert into statement, this is what I get:
SQL compilation error: syntax error line 3 at position 1 unexpected ';'.
I tried including a comma , before the insert into statement, this is what I get:
SQL compilation error: syntax error line 4 at position 0 unexpected 'insert'. syntax error line 5 at position 0 unexpected 'select'.
What am I doing wrong here? Based on a lot of other posts, I figured this is how we use insert into with a CTE.

Answer 1

If you are not obliged to use CTE (basically using CTE does not make much sense when you want to create a new Table), you can try, like:
INSERT INTO new (tmp1, tmp2)
SELECT tmp1,tmp2
FROM old
Edit: Assuming SQL Server

Answer 2

As stated in the comments, you are very close but a CTE doesn't create a table, which is why it doesn't work.
This bit is fine:
with new as
(
select combination.item1, combination.subitem1, combination.item2,
combination.subitem2,
(
select tmp.item1, tmp.subitem1, tmp.item2, tmp.subitem2,
case when ((tmp.item1 = tmp.item2) and
(tmp.subitem1 = tmp.subitem2)) then 'TRUE' else
'FALSE' end as indicator from
(
select distinct item as item1, subitem as subitem2
from old
cross join
select distinct item as item2, subitem as subitem2
from old
) tmp
) combination
where combination.indicator = 'FALSE'
)
The next line:
insert into new (pair_volume)
You cannot insert into new. There is no table called "new". Even if you could insert into the CTE, there is no column called pair_volume.
You need to create a seperate table to contain the data output that you are creating.
Do you have a fixed number of subitems? If not, it becomes more complex and you will need to use dynamic SQL to build a query to get the result that you want, or if your RDBMS supports it you could use SELECT INTO to dynamically create a table from the resultset.