===== Keep Matching =====

This transformation only keeps rows where values in the specified column exist in the specified column of another table.

EXAMPLE

**Table 1:** Average income and deductions

^  Country  ^  Gross income   ^  Disposable income  ^  Compulsory deductions  ^
| United States  |  56067  |  45582  |  18.7%  |
| Ireland  |  51218  |  48073  |  6.14%  |
| Luxembourg  |  55176  |  47716  |  13.52%  |
| Australia  |  51050  |  42617  |  16.52%  |
| Switzerland  |  53716  |  48414  |  9.87%  |
| Canada  |  45896  |  37469  |  18.36%  |

**Table 2:** Some European Countries

^  Country  ^
| Ireland  |
| Luxembourg  |
| Switzerland  |


**Objective:** Keep only the European countries in the first table.

**Transformation parameters:**

  * Column of the first table: Country
  * Matching values in table: Table 2
  * Column of the second table: Country

**Result:**

^  Country  ^  Gross income   ^  Disposable income  ^  Compulsory deductions  ^
| Ireland  |  51218  |  48073  |  6.14%  |
| Luxembourg  |  55176  |  47716  |  13.52%  |
| Switzerland  |  53716  |  48414  |  9.87%  |


=== See also ===
  * [[transformations:keepdifferent|Keep Different]]