Multiple INSERT's INTO temp table w/ Primary Key

Hi all -
I need to create a temp table containing all Items with activity for the
last five years. These records will be coming from a few different tables.
So I have the following . . .
CREATE TABLE #tt_item (item nvarchar(30) PRIMARY KEY)
INSERT INTO #tt_item
SELECT dbo.item.item
FROM Orders
. . . . which I'll have to repeat for each table in question.
My question is, with the PRIMARY KEY on the #tt_item table, how do I check
for the existence of an Item in #tt_item as I'm doing the INSERT?This depends on what you want to do when there is a conflict (Duplicate key
value)...
Do you want to ignore the dupe, (not insertt it)? If so, then
CREATE TABLE #tt_item (item nvarchar(30) PRIMARY KEY)
-- --
INSERT INTO #tt_item(item)
SELECT O.item
FROM Orders O
Where Not Exists (Select * From #tt_item
Where item = O.item)
If otoh, you want to insert them anyway, then you cannot use item as the
primary key of the temp table... You will need to make a composite key
consisting of, say, (Sourcetable, item)
"Michael.Fisher" wrote:

> Hi all -
> I need to create a temp table containing all Items with activity for the
> last five years. These records will be coming from a few different tables
.
> So I have the following . . .
> CREATE TABLE #tt_item (item nvarchar(30) PRIMARY KEY)
> INSERT INTO #tt_item
> SELECT dbo.item.item
> FROM Orders
> . . . . which I'll have to repeat for each table in question.
> My question is, with the PRIMARY KEY on the #tt_item table, how do I check
> for the existence of an Item in #tt_item as I'm doing the INSERT?|||This depends on what you want to do when there is a conflict (Duplicate key
value)...
Do you want to ignore the dupe, (not insertt it)? If so, then
CREATE TABLE #tt_item (item nvarchar(30) PRIMARY KEY)
-- --
INSERT INTO #tt_item(item)
SELECT O.item
FROM Orders O
Where Not Exists (Select * From #tt_item
Where item = O.item)
If otoh, you want to insert them anyway, then you cannot use item as the
primary key of the temp table... You will need to make a composite key
consisting of, say, (Sourcetable, item)
"Michael.Fisher" wrote:

> Hi all -
> I need to create a temp table containing all Items with activity for the
> last five years. These records will be coming from a few different tables
.
> So I have the following . . .
> CREATE TABLE #tt_item (item nvarchar(30) PRIMARY KEY)
> INSERT INTO #tt_item
> SELECT dbo.item.item
> FROM Orders
> . . . . which I'll have to repeat for each table in question.
> My question is, with the PRIMARY KEY on the #tt_item table, how do I check
> for the existence of an Item in #tt_item as I'm doing the INSERT?|||INSERT INTO #tt_item (item)
SELECT O.item
FROM Orders AS O
LEFT JOIN #tt_item AS I
ON O.item = I.item
WHERE I.item IS NULL
OR:
INSERT INTO #tt_item (item)
SELECT item
FROM Orders
UNION
SELECT item
FROM Foo
UNION
SELECT item
FROM Bar
UNION
..
David Portas
SQL Server MVP
--|||Many thanks David, as well as CBretana, for providing these timely, helpful
examples. Looks like any of these will work.
"David Portas" wrote:

> INSERT INTO #tt_item (item)
> SELECT O.item
> FROM Orders AS O
> LEFT JOIN #tt_item AS I
> ON O.item = I.item
> WHERE I.item IS NULL
> OR:
> INSERT INTO #tt_item (item)
> SELECT item
> FROM Orders
> UNION
> SELECT item
> FROM Foo
> UNION
> SELECT item
> FROM Bar
> UNION
> ...
> --
> David Portas
> SQL Server MVP
> --
>