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how to view index in oracle sql?

An index represents a schema object that contains an entry for each value that appears in the indexed column(s) of the table or cluster and provides direct, … Read More

Posted in SQL   

how to create index in oracle sql?

An index represents a schema object that contains an entry for each value that appears in the indexed column(s) of the table or cluster and provides direct, … Read More

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What are Indexes in SQL?

An index represents a schema object that contains an entry for each value that appears in the indexed column(s) of the table or cluster and provides direct, … Read More

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what do you mean by subquery?

A subquery refers to a select statement that is embedded in a clause of another select statement.
Syntax

SELECT columnName1, columnName2
FROM   tableName1, tableName2
WHERE  columnName OPERATOR
   
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what is the use of nvl function in sql?

The nvl() function return an alternative value when an expression is NULL.
Syntax:

NVL(string, replaceWith)

Where:
string : represents the string to test for a null value.… Read More

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