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Oracle Greatest()函数
GREATEST
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.
The data type of the first expression.
GREATEST (expr [, expr]...)
- expr
-
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
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最后更新：2017-04-03 12:55:24