SQL check if ID exists and process different insert statement

The below statement should determine which part is called dependent on if the ProductID exists or not,
so if the ProductID does not exists i want query 1 to call, otherwise if it does exist i want query 2
to call, my issue lies within the SELECT statement at the top, what am I doing wrong

IF NOT EXISTS(SELECT TOP 1 ProductID FROM ProductTable)
BEGIN
--QUERY 1
INSERT
(ProductName, UnitPrice)
SELECT
ProductView.ProductName,
ProductView.UnitPrice
FROM ProductView
INNER JOIN ProductTable ON ProductView.ProductID = ProductTable. ProductID
WHERE ProductID = (SELECT TOP 1 ProductID FROM ProductTable ORDER BY changedate DESC)
AND NOT EXISTS(SELECT 1 FROM ProductTable WHERE ProductView.ProductID = ProductTable.ProductID)
END
ELSE
--QUERY 2
INSERT
(ProductName, UnitPrice)
SELECT
ProductView.ProductName,
UnitPrice = 0.00
FROM ProductView
INNER JOIN ProductTable ON ProductView.ProductID = ProductTable. ProductID
WHERE ProductID = (SELECT TOP 1 ProductID FROM ProductTable ORDER BY changedate DESC)
LVL 1
wint100Asked:
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lluddenCommented:
Don't you need a where clause on that select?  This will never fire Query 1 if there are any items at all in ProductTable.
0
Scott PletcherSenior DBACommented:
You must provide a table name to INSERT to:

--QUERY 1
INSERT <table_name_must_go_here>
(ProductName, UnitPrice)
0
wint100Author Commented:
Thanks for you help, my modified code is as follows, but an error still exists. The If statement just doesn't get called:

IF NOT EXISTS(SELECT TOP 1 PartReference FROM ProductTable)
BEGIN
--QUERY 1
INSERT INTO ProductTable
(ProductName, UnitPrice)
SELECT
ProductView.ProductName,
ProductView.UnitPrice
FROM ProductView
INNER JOIN ProductTable ON ProductView.ProductID = ProductTable. ProductID
WHERE ProductID = (SELECT TOP 1 ProductID FROM ProductTable ORDER BY changedate DESC)
AND NOT EXISTS(SELECT 1 FROM ProductTable WHERE ProductView.ProductID = ProductTable.ProductID)
END
ELSE
--QUERY 2
INSERT INTO ProductTable
(ProductName, UnitPrice)
SELECT
ProductView.ProductName,
UnitPrice = 0.00
FROM ProductView
INNER JOIN ProductTable ON ProductView.ProductID = ProductTable. ProductID
WHERE ProductID = (SELECT TOP 1 ProductID FROM ProductTable ORDER BY changedate DESC)

Open in new window

0
PortletPaulfreelancerCommented:
try this as a test:

select case when NOT EXISTS(SELECT TOP 1 PartReference FROM ProductTable) then 'not exists' else 'exists' end

Query 1 cannot be executed unless you have deleted all records from [ProductTable]

Please reconsider lludden's point: You need a where clause in the very first part of our query

IF NOT EXISTS(SELECT TOP 1 PartReference FROM ProductTable WHERE SOME CONDITION IS HERE)
0

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Microsoft SQL Server 2008

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