# ComputedColumn

A user-defined column in the result set.

### Description

A computed column is a user-defined column produced as an expression of other columns within the data set. It is not one of the columns retrieved directly from the underlying data provider.

### See Also

## name

The name of the computed column.

### Description

The name of the computed column and is required. The name must be unique within the result set.

### See Also

The Result Column Names section for the naming rules.

## dataType

Column data type property.

### Description

Column data type property.

## expression

The BIRT expression that defines the value of the computed column.

### Description

The expression that gets evaluated and its resulting value assigned to the computed column.

### See Also