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GREATEST function in Oracle

GREATEST is one of the vital Numeric/Math functions of Oracle. It is used to get the greatest value from a list of expressions. The GREATEST function is supported in the various versions of the Oracle/PLSQL, including, Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i and Oracle 8i.

Syntax:

GREATEST( expr_1, expr_2, ... expr_n )

Parameters:
expr_1, expr_2, … expr_n: It is used to specify the expression to be evaluated.

Example 1:

GREATEST( 5, 6, 9, 10 )

Output:

10

Explanation:
The greatest value is 10 in the above expression.

Example 2:

GREATEST( ‘5’, ‘6’, ‘9’, ‘10’ )

Output:

 ‘9’

Explanation:
Since it is a character comparison, hence ‘9’ here is Greatest since it has a higher character set value.

Example 3:

GREATEST( ‘ant’, ‘boy’, ‘elephant’, ‘zebra’ )

Output:

 ‘zebra’ 

Explanation:
Since it is a character comparison, hence ‘zebra’ here is Greatest since it has a higher character set value.

Example 4:

GREATEST( ‘ant’, ‘any’, ‘ani’, ‘ana’ )

Output:

 ‘any’ 

Explanation:
Since it is a character comparison, hence ‘any’ here is Greatest since it has a higher character set value.

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