What is primary key and unique key?


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Give the structure of the function ?

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If there are 1 to 100 numbers in a table and in that 100 numbers some 10 numbers are deleted.I want to find out the missing numbers between 1 to 100 by pl/sql how?

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Is sql procedural language?

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What is the most important ddl statements in sql are?

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Can I create table without primary key?

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What are the parts of a basic sql query?

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