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Teradata - What is a pseudo key? What is its use?




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asked mar September 20, 2014 06:37 AM  

What is a pseudo key? What is its use?


           

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answered By vishnoiprem   0  
it is used in locks the row hash
best to tell EXPLAIN in this explanation we locks pseudo key then it start

it is used in locks the row hash
best to tell EXPLAIN in this explanation we locks pseudo key then it start

If a table in a database either has no natural key or the natural key is so long that using it as the key would be
inefficient then we need to consider using a pseudokey instead. Pseudokeys are usually given the same name as the
table they belong to with _id added to the end of the name.
They usually are defined to contain a number and use auto increment in mySQL or the equivalent in other versions
of SQL to dynamically allocate a value when new rows are created.
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Asked 2 years and 3 months ago ago
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