AID – LOGICAL OPERATORS
- AND
This operator allows to select those files which contain both terms of the expression.
For instance: Machinery AND engines
- OR
The "(OR)" operator allows to select those records which contain one of the terms of the expression, or both simultaneously.
For instance: Machinery OR engines
- NOT
The "NOT" operator allows to select those records which contain the first term of the expression, but not the second.
For instance: Machinery NOT engines
The logical operators can be used in more complex expressions made up by several words, making groups using parenthesis.
For instance: (engines OR machinery) AND (mining OR metallurgy)
- UNDERSCORE
Underscore "_" replaces any other character. if you type the expression "español_s" the terms that we will obtain will be "españoles" and "españolas".
- Percentage
The percentage "%" replaces a chain of characters of any length. According to the above, when typing on the text box the expression "auto%", all the terms which begin with “auto” will appear, such as "automático", "autovía", "automóvil", etc. And if the expression "español_s" is typed, the terms "españoles" and "españolas" will appear, for instance.