Which syntax is used to exclude specific sets of fields in an Explore?

The syntax used to exclude specific sets of fields in an Explore is the minus sign (-). In Looker, when you want to define an Explore and limit the fields available for exploration or reporting, using this syntax allows you to specify which fields should be omitted from the results. This is useful when you only want to concentrate on certain fields while hiding others that may not be relevant to the current analysis.

For example, if you have a set of fields and you want to exclude a few from appearing in the Explore interface, you would place a minus sign in front of those fields. This straightforward approach enhances the clarity and usefulness of the Explore by preventing clutter with unnecessary fields.

The other options such as the plus sign (+), exclamation mark (!), and greater-than sign (>) do not function as exclusion indicators within LookML syntax, making them inappropriate for this context. The plus sign, for example, is typically used to add fields, while the exclamation mark has different uses within LookML that do not pertain to excluding fields in an Explore.