Expressions - Amazon Redshift
Simple expressions
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Expressions

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An expression is a combination of one or more values, operators, or functions that evaluate to a value. The data type of an expression is generally that of its components.

Simple expressions

A simple expression is one of the following:

  • A constant or literal value

  • A column name or column reference

  • A scalar function

  • An aggregate (set) function

  • A window function

  • A scalar subquery

Examples of simple expressions include: 

5+12
dateid
sales.qtysold * 100
sqrt (4)
max (qtysold)
(select max (qtysold) from sales)