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.
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
➠ Advantages of surrogate key
➠ Disadvantages of surrogate key
➠ How to generate surrogate key in Teradata
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