The relation (table) schema is multimedia (mm_id, f_name, extension, directory, size).
1) Identify at least three super keys for the relation called ?multimedia?.
2) Identify at least two candidate keys for the relation called ?multimedia?
Thanks much
can anyone explain what are superkeys & candidate keys with a simple example?
Thanx...
I have a table that looks like this:
ItemID TokenID WordCount
12345 11334 5
12345 3453 1
12345 546546 2
12345 242555 1
12345 556346 4
12345 346346 1
Code SnippetCREATE TABLE [dbo].[ItemTokensLink](
[ItemID] [int] NOT NULL,
[TokenID] [int] NOT NULL,
[WordCount] [int] NOT NULL DEFAULT ((1)),
CONSTRAINT [PK_ItemTokensLink_1] PRIMARY KEY CLUSTERED
(
[ItemID] ASC,
[TokenID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
So this table has now reached over 22 million rows. The problem is my machine only has 1GB ram....so SQl Server tries to load up the whole table and this is ~560MB....equals zero ram for ...well anything else!
Does SQL Server load up an entire table when performing an INSERT?
Code Snippet
INSERT INTO ItemTokensLink(ItemID, TokenID, WordCount)
SELECT DISTINCT @ItemID as ItemID, t.TokenID, Count(t.TokenID) as WordCount
FROM #Tokens t
Group by TokenID
@ItemID is parameter provided
#Tokens is a temp table create with a word list
Would partitioning help here?
The table is is 80% of the time added to and the ItemID will always increase. What is the best to deal with massive tables that are inserted to frequently?
How does SQL Server decide when to load a table into memory?
TIA
Hi What is the difference between Candidate key , composite key and alternate key. I went through many websites but I didn't get examples. There were only definitions. Can anyone please tell me the site or blogs that elaborate this concept RegardsKaran
View 2 Replies View RelatedI did lot of google but did not get script for candidate and super key. I do not have syntax to create candidate and super key in sql.
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Thanks, Norman