SQL Reduction Functions

Updated on 2025-02-12 GMT+08:00

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Description

Reduction functions operate on zero or a list of expressions and return a single expression. If no expression is passed as a parameter, the result is NULL. All expressions must be converted to public data types.

If all parameters are NULL, the result is NULL. Otherwise, NULL parameters are ignored.
If all parameters contain both numbers and strings, they are interpreted as strings.
If all parameters are integers, they are interpreted as long integers.
If all parameters are numeric and at least one of them is double, all parameters are interpreted as double.

Syntax

GREATEST([expr1, ...])/ LEAST([expr1, ...])

Examples

GREATEST([expr1, ...])/LEAST([expr1, ...])

The GREATEST function returns the maximum value in zero or a list of expressions.

The LEAST function returns the minimum value in zero or a list of expressions.

Example field
Num: 11785730

Query and analysis statement

select  Num,GREATEST( "Num"/10,(select count(1)) ),LEAST("Num"/10,(select count(1)))

Query and analysis result

**Table 1** Query and analysis result of reduction functions
Num	EXPR$1	EXPR$2
11785730	1178573	1

Parent topic: SQL Analysis Syntax

Previous topic: SQL IP Address Functions

Next topic: Other SQL Functions

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