The Transform Builder enables you to rapidly assemble complete transform steps through a simple menu-driven interface. After you select the transformation to apply, all relevant parameters can be configured through selection or type-ahead fields, so that you can choose from only the elements that are appropriate for the selected transformation.
To open the Transform Builder, begin creating a step through one of the following methods:
|Accept the currently selected item and move to the next field.|
|Move to the previous field.|
From the Search panel, begin typing to see the list of available transformations. Select your preferred one.
union transforms have dedicated pages for configuring this transformations. You can enter
union as the transformation to open the corresponding tool.
For a list of available transformations, see Transformation Reference.
Depending on the transform that you have selected, you must specify one or more of the following types of parameters in the Transform Builder.
deduplicate, require no parameters.
The following are general categories of parameters:
Select or specify the column or columns to which to apply the transform.
Tip: To specify a range of columns, insert a tilde (
For some transforms, you can specify patterns to identify conditions or elements of the data on which to take action. These matching patterns can be specified using one of the following types.
Tip: After you have used a pattern or string literal in one transform step, you can apply it in another. In the pattern field in the Transform Builder, click Browse Pattern History.
|Literal value||An exact string or value.|
The following matches on the exact value between the quotes:
supports a variety of macro-like pattern identifiers, which can be used in place of more complex regular expressions.
The following matches when two digits appear at the beginning of a value:
|Regular expression pattern|
Regular expressions are a standard method of describing matching patterns.
The following matches on all numerical values from 0 to 99:
For more information on pattern-based matching, see Text Matching.
In the Transform Builder, transforms that require delimiter are organized into delimiter groups, so that you specify only the elements of a pattern that work together. Delimiter groups apply to the following transforms:
Delimiter groups are listed below.
|On delimiter||Transformation is applied based on a specific literal or pattern.|
|Between delimiters||Transformation is applied on database between two literal or pattern-based delimiters. Details are below.|
|On multiple delimiters|
Transformation is applied based on a sequence of delimiters. An individual pattern can be a string literal, , or regular expression, and the sequence can contain combinations of these pattern types.
|Between positions||Transformation is applied based on a starting index position and an ending index position. Index positions start from 0 on the left side of any cell value.|
|On positions||Transformation is applied based on a sequence of listed index positions. Index positions start from 0 on the left side of any cell value.|
|At regular interval||Transformation is applied at every nth position. Index positions start from 0 on the left side of any cell value.|
For more information on the underlying syntax for delimiter groups, see Pattern Clause Position Matching.
Matches any values that appear between two delimiters. One delimiter describes the beginning of the match, and the other delimiter describes the end of the match.
Each delimiter can either include or exclude the matching value:
|Transform Builder option||Include as part of transform||Include/Exclude|
|Start delimiter||false||Excludes sub-pattern|
|Start delimiter||true||Includes sub-pattern|
|End delimiter||false||Excludes sub-pattern|
|End delimiter||true||Includes sub-pattern|
A condition is an expression that yields a
false value. A condition may include all of the elements of a formula. This value determines whether the transformation is applied to the evaluated row.
A number of transforms support the following parameters.Group parameter: For transforms that aggregate data, such as
window, you can specify the column by which you wish to group the computed aggregations. In the following example, all values in the
POS_Sales column are summed up for each value in the
Assuming that there are entries in the
Store_Nbr column, the resulting transform step has 50 rows, each of which contains the total sales for the listed store number.
Order parameter: Some transforms support the
order parameter, which allows you to specify the column of values that are used to sort the output. In the following example, all aggregates
Sales values are ordered by the contract date and grouped by State:
The output can always be ordered using the
sort transform. See Sort Transform.
New Column Name parameter: For transforms that generate new columns, such as
extract, you can optionally specify the name of the new column, which saves adding a step to rename it. In the following example, the values of
colB are summed and written to the new column
Depending on the transform, you may be presented with other required or optional parameters to specify. See Transforms.
When you have finished your transform step, review the preview in the data grid.
If the results look ok, click Add.
The step is added to your recipe and applied to the data grid.
After you have added a step, you can modify it as needed. In the Recipe panel, select the Pencil icon next to the recipe step. The step is displayed for editing in the Transform Builder.