what is a constraint? Tell me about its various levels. : Sql dba

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how to create a database in oracle?

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What is cartesian join in sql?

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Is sqlexception checked or unchecked?

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What are the basic techniques of indexing?

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how to select alphabets in a one column , for this the table name is PA_TASKS and column name is TASK_NUMBER, In TASK_NUMBER the data like this 1.1.3NN,1.1.4NN,1.5.1NN,1.3.2NE,1.5NN,1NN,1.2NE,1CE , For this i need to disply output as NN,NN,NN,NE,NN,NN,NE,CE, Its some urgent requirement ,thanks in advance

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Do prepared statements prevent sql injection?

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What is the advantage of index in sql?

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Explain what is a column in a table?

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What is sap sql?

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How to find string or key value using pl/sql code?

2 Answers   Ramco,

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What are different categories of sql commands?

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