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Selecting the identical columns you want to compare

Procedure

  1. Expand DB connections and in the desired database, browse to the columns you want to analyze, select them and then click Finish to close the wizard.
    A file for the newly created analysis is listed under the Analysis folder in the DQ Repository tree view. The analysis editor opens with the defined analysis metadata.
    Overview of the Analysis Metadata section in the Analysis Settings tab.
    The display of the analysis editor depends on the parameters you set in the Preferences window. For more information, see Setting preferences of analysis editors and analysis results.
  2. Click Analyzed Column Sets to open the view where you can set the columns or modify your selection.
    In this example, you want to compare identical columns in the account and account_back tables.
    Overview of the Analysis Column Sets section in the Analysis Settings tab.
  3. From the Connection list, select the database connection relevant to the database to which you want to connect.
    You can find in this list all the database connections you create and centralize in the Talend Studio repository.
  4. Click A column Set to open the Column Selection dialog box.
  5. Browse the catalogs/schemas in your database connection to reach the table holding the columns you want to analyze.
    You can filter the table or column lists by typing the desired text in the Table filter or Column filter fields respectively. The lists will show only the tables/columns that correspond to the text you type in.
  6. Click the table name to list all its columns in the right-hand panel of the Column Selection dialog box.
  7. In the list to the right, select the check boxes of the columns you want to analyze and click OK to proceed to the next step.
    Selection of the columns to be analyzed.
    You can drag the columns to be analyzed directly from the DQ Repository tree view to the editor.
    If you right-click any of the listed columns in the Analyzed Columns view and select Show in DQ Repository view, the selected column will be automatically located under the corresponding connection in the tree view.
  8. Click B Column B Set and follow the same steps to select the second set of columns or drag it to the right column panel.
  9. If you want to match the data from the A set against the data from the B set and not vice versa, select the Compute only number of A rows not in B check box.
  10. Select the Ignore Null check box if you want to ignore the NULL values when matching.

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