Oracle Greatest()函数

The GREATEST function returns the largest expression in a list of expressions. All expressions after the first are implicitly converted to the data type of the first expression bef
The GREATEST function returns the largest expression in a list of expressions. All expressions after the first are implicitly converted to the data type of the first expression before the comparison.

To retrieve the smallest expression in a list of expressions, use LEAST.

Return Value

The data type of the first expression.

Syntax

GREATEST (expr [, expr]...)

Arguments

An expression.

Example 16-3 Finding the Longest Text Expressions

The following statement selects the longest string.

SHOW GREATEST (Harry, Harriot, Harold)

Harriot

Example 16-4 Finding the Largest Numerical Expression

The following statement selects the number with the greatest value.

SHOW GREATEST (5, 3, 18)

18

原文地址：点击打开链接