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1. Generating Surrogate Key In Teradata
2. Database Surrogate Key Definition
3. Generate Surrogate Key In Teradata Office

Surrogate keys are typically arbitrary system-generated sequential integers. You can generate surrogate keys in Teradata Database using the identity column feature (see Identity Columns ). To use an identity column to generate surrogate key values, specify the GENERATED ALWAYS and NO CYCLE options and ensure that the data type for the column is either NUMERIC(18,0) or DECIMAL(18,0). You can generate surrogate keys in Teradata Database using the identity column feature (see “Identity Columns” on page 537). To use an identity column to generate surrogate key values, specify the GENERATED ALWAYS and NO CYCLE options and ensure that the data type for the column is either NUMERIC(18,0) or DECIMAL(18,0). 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. Here I show an approach to create a sequentially increasing surrogate key without the use of variables or CSUM. ➠ How to generate surrogate key in Teradata By using analytical functions By using CSUM analytical function, Syntax/Example 1: SELECT (SELECT ZEROIFNULL(MAX(empno)) FROM employee) + CSUM(1,1) AS surrogatekey1newempno,empno,empname from.

Open the Surrogate Key Generator stage editor. On the Stage page, define the stage properties: Click the Properties tab. Type a name for the surrogate key column in.

Teradata: Surrogate Key Concept

Surrogate Key is a unique, database supplied or generated identifier generally used as the primary key/index of a table.

➠ When to use a surrogate key

• Surrogate key should be used if each row of table cannot be uniquely identified using 1 or more columns.
• Surrogate key can also be used when a unique key is too long and non-numeric.

➠ Advantages of surrogate key

• Each row can be uniquely identified within a table using surrogate key value.
• Surrogate key can be used as primary index for a table to distribute data evenly on all the AMPs.

Generating Surrogate Key In Teradata

➠ Disadvantages of surrogate key

• We cannot derive any meaning or relationship between the surrogate key and the rest of the data columns in a row, therefore surrogate keys have no meaning to the users.
• There will be cases when data will be shared among different databases. In this case, same rows(from different database) may have different surrogate key and different rows(from different database) may have same surrogate key.

Database Surrogate Key Definition

➠ How to generate surrogate key in Teradata

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• By using analytical functions
  1. By using CSUM analytical function, Syntax/Example 1:Single AMP (usually vproc 0) generally processes all the data when using CSUM(1,1)
     
  2. By using SUM analytical function, Syntax/Example 2:
     
  3. By using ROW_NUMBER analytical function, Syntax/Example 3:Note: '(SELECT ZEROIFNULL(MAX(emp_no)) FROM employee)' is used in above examples to generate new sequence which must be greater than the current max value present in the table.
  
  
• By using Identity column, check Identity Columns page for more detail on Identity Column(Sequence) in Teradata.
  Syntax/Example 4:Note: There will always be gaps in generated number when using identity column because in Teradata it is not one sequence but multiple parallel sequences(one on each AMP).

Generate Surrogate Key In Teradata Office