I have a 2 tables in a MS SQL 2008 Database, Listings and ListingType, I want to create a select statement that will give me all rows from Listing that do not have their ListingID in the ListingType table.
I'm very confused about how to even start this statement.
Example SQL Statement - Does a lot more than what I explained, but you should be able to get what I'm asking from it.
SELECT Listing.Title, Listing.MLS, COALESCE (Pictures.PictureTH, '../default_th.jpg') AS PictureTH, COALESCE (Pictures.Picture, '../default.jpg') AS Picture, Listing.ID,
Listing.Description, Listing.Lot_Size, Listing.Building_Size, Listing.Bathrooms, Listing.Bedrooms, Listing.Address1, Listing.Address2,
Listing.City, Locations.Abbrev, Listing.Zip_Code, Listing.Price, Listing.Year_Built, ListingTypeMatrix.ListingTypeID
FROM Listing INNER JOIN
Locations ON Listing.State = Locations.LocationID LEFT OUTER JOIN
ListingTypeMatrix ON Listing.ID = ListingTypeMatrix.ListingID LEFT OUTER JOIN
Pictures ON Listing.ID = Pictures.ListingID
WHERE (ListingTypeMatrix.ListingTypeID = '4') AND
((Pictures.ID IS NULL) OR (Pictures.ID =
(SELECT MIN(ID)
FROM Pictures
WHERE (ListingID = Listing.ID))))
ListingTypeMatrix.ListingTypeID = '4' is the part I dont know what to change it to, because there will not be a record for it.
How to Select All Records from One Table That Do Not Exist in Another Table in SQL? We can get the records in one table that doesn't exist in another table by using NOT IN or NOT EXISTS with the subqueries including the other table in the subqueries.
One SQL code can have one or more than one nested query. Syntax: SELECT * FROM table_name WHERE column_name=( SELECT column_name FROM table_name); Query written after the WHERE clause is the subquery in above syntax.
Now if we look at the question: To return records from the left table which are not found in the right table use Left outer join and filter out the rows with NULL values for the attributes from the right side of the join. Save this answer.
SELECT t.*
FROM LISTING t
WHERE NOT EXISTS(SELECT NULL
FROM LISTINGTYPE lt
WHERE lt.listingid = t.listingid)
SELECT t.*
FROM LISTING t
WHERE t.listingid NOT IN (SELECT lt.listingid
FROM LISTINGTYPE lt)
SELECT t.*
FROM LISTING t
LEFT JOIN LISTINGTYPE lt ON lt.listingid = t.listingid
WHERE lt.listingid IS NULL
Quote:
In SQL Server, NOT EXISTS and NOT IN predicates are the best way to search for missing values, as long as both columns in question are NOT NULL. They produce the safe efficient plans with some kind of an Anti Join.
LEFT JOIN / IS NULL is less efficient, since it makes no attempt to skip the already matched values in the right table, returning all results and filtering them out instead.
SELECT *
FROM Listing l
LEFT JOIN ListingType t ON l.ID = t.ListingID
WHERE t.ListingID IS NULL
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