# QBColumns

## Overview

`QBColumns` represents a collection of columns within a datasource, providing access to all columns for building query components such as select and where clauses. Individual columns can be accessed through `QBColumn` for more granular control over data expressions, such as sorting, conditions, and aggregations. For further details on accessing all columns, see [QBTableClause.columns](https://docs.servoy.com/reference/servoycore/dev-api/database-manager/qbtableclause#columns). For working with specific columns, refer to [QBColumn](https://docs.servoy.com/reference/servoycore/dev-api/database-manager/qbcolumn).

***