# QBPart

## Overview

The `QBPart` class serves as a generic SQL component within the `QBSelect` framework. It provides foundational support for query construction by linking to parent and root query elements.

By referencing the parent table clause or root query, `QBPart` integrates into larger query structures, supporting complex scenarios in SQL execution.

For further details on query construction and execution, refer to the [QBSelect documentation](https://docs.servoy.com/reference/servoycore/dev-api/database-manager/qbselect).

## Properties Summarized

| Type                                                                             | Name              | Summary                                                                      |
| -------------------------------------------------------------------------------- | ----------------- | ---------------------------------------------------------------------------- |
| [QBTableClause](/reference/servoycore/dev-api/database-manager/qbtableclause.md) | [parent](#parent) | Get query builder parent table clause, this may be a query or a join clause. |
| [QBSelect](/reference/servoycore/dev-api/database-manager/qbselect.md)           | [root](#root)     | Get query builder parent.                                                    |

## Properties Detailed

### parent

Get query builder parent table clause, this may be a query or a join clause.

**Type**\
[QBTableClause](/reference/servoycore/dev-api/database-manager/qbtableclause.md)

**Sample**

```js
var query = datasources.db.example_data.person.createSelect();
	query.where.add(query.joins.person_to_parent.joins.person_to_parent.columns.name.eq('john'))
	foundset.loadRecords(query)
```

### root

Get query builder parent.

**Type**\
[QBSelect](/reference/servoycore/dev-api/database-manager/qbselect.md)

**Sample**

```js
var subquery = datasources.db.example_data.order_details.createSelect();

	var query = datasources.db.example_data.orders.createSelect();
	query.where.add(query
		.or
			.add(query.columns.order_id.not.isin([1, 2, 3]))

			.add(query.exists(
					subquery.where.add(subquery.columns.orderid.eq(query.columns.order_id)).root
			))
		)

	foundset.loadRecords(query)
```

***


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