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Generating a sequential Surrogate Key in Teradata This has to the commonest problem of all in the Data Warehousing World. And people suggest different ways to tackle this based on their comfort level. RAND(CHECKSUM(NEWID)) The above will generate a (pseudo-) random number between 0 and 1, exclusive. If used in a select, because the seed value changes for each row, it will generate a new random number for each row (it is not guaranteed to generate a unique number per row however). How to generate AUTOMATIC Number in Teradata SQL. I want to generate AUTOMATIC Number to use TD SQL, for example as follows. Hi Joe,thanks,teradata forums it.

Key Responsibilities:. You are responsible for engineering, and deploying security services and software in large distributed and Hybrid Cloud environments. Develop next generation security framework and design ensuring adequate levels of security of Teradata. We keep getting questions about which one to use for sequence number generation in Teradata. Many people use CSUM(1,1) as its easier and other databases support that. But, in Teradata, it is not recommended. To test this out, we ran the below queries today on a table that contains 60K rows and another with just 1000 rows. Example script:- Using CSUM. Apr 20, 2006  Surrogate keys. Relational theory talks about something called a “candidate key.” In SQL terms, a candidate key is any combination of columns that uniquely identifies a row (SQL and the relational model aren’t the same thing, but I’ll put that aside for this article). The data’s primary key is the minimal candidate key.

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A row is assigned to a particular AMP based on the primary index value. Teradata uses hashing algorithm to determine which AMP gets the row.

Following is a high level diagram on hashing algorithm.

Following are the steps to insert the data.

• The client submits a query.

• The parser receives the query and passes the PI value of the record to the hashing algorithm.

• The hashing algorithm hashes the primary index value and returns a 32 bit number, called Row Hash. Illustrator cs4 serial key generator mac.

• The higher order bits of the row hash (first 16 bits) is used to identify the hash map entry. The hash map contains one AMP #. Hash map is an array of buckets which contains specific AMP #.

• BYNET sends the data to the identified AMP.

• AMP uses the 32 bit Row hash to locate the row within its disk.

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• If there is any record with same row hash, then it increments the uniqueness ID which is a 32 bit number. For new row hash, uniqueness ID is assigned as 1 and incremented whenever a record with same row hash is inserted.

• The combination of Row hash and Uniqueness ID is called as Row ID.

• Row ID prefixes each record in the disk.

• Each table row in the AMP is logically sorted by their Row IDs.

How Tables are Stored

Tables are sorted by their Row ID (Row hash + uniqueness id) and then stored within the AMPs. Row ID is stored with each data row.

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CREATE TABLE command is used to create tables in Teradata.

Syntax

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Following is the generic syntax of CREATE TABLE statement.

• Table Options − Specifies the physical attributes of the table such as Journal and Fallback.

• Column Definition − Specifies the list of columns, data types and their attributes.

• Index Definition − Additional indexing options such as Primary Index, Secondary Index and Partitioned Primary Index.

Example

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The following example creates a table called employee with FALLBACK option. The table contains 5 columns with EmployeeNo as the Unique Primary Index.

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Once the table is created, you can use SHOW TABLE command to view the Definition of the table.