- In the rule editor and in the Matching Key table, click the [+] button to add a row to the table.
Set the parameters of the matching key as the following:
For further information about the match rule parameters, see the tMatchGroup documentation in the Talend Components Reference Guide.
Match Key Name: Enter the name of your choice for the match key.
Matching Function: Select the type of matching you want to perform from the drop-down list. Select Custom if you want to use an external user-defined matching algorithm.
In this example two match keys are defined, you want to use the Levenshtein and Jaro-Winkler match methods on first names and last names respectively and get the duplicate records.
Custom Matcher: This item is only used with the Custom matching function. Browse and select the Jar file of the user-defined algorithm.
Confidence Weight: Set a numerical weight (between 1 and 10) to the column you want to use as a match key. This value is used to give greater or lesser importance to certain columns when performing the match.
Handle Null: Specify how to deal with data records which contain null values.
In the Match threshold field, enter the
match probability threshold. Two data records match when the probability is
above this value.
In the Confident match threshold field, set a numerical value between the current Match threshold and
1. Above this threshold, you can be confident about the quality of the group.
To define a second match rule, place your cursor on the top right corner
of the Matching Key table and then click
the [+] button.
Follow the steps to create a match rule.When you define multiple conditions in the match rule editor, an OR match operation is conducted on the analyzed data. Records are evaluated against the first rule and the records that match are not evaluated against the second rule.
If required, put your cursor on the top right corner of the table and
click the button then replace the default names of the rules with
names of your choice.
You can also use the up and down arrows in the dialog box to change the rule order and thus decide what rule to execute first.
The rules are named and ordered accordingly in the Matching Key table.
Save the match rule settings.
The match rule is saved and centralized under Libraries > Rule > Match in the DQ Repository tree view.