Contents:
Functions:
| Item | Description |
|---|---|
| STARTSWITH Function |
Returns true if the leftmost set of characters of a column of values matches a pattern. The source value can be any data type, and the pattern can be a Pattern , regular expression, or a string.
|
| ENDSWITH Function |
Returns true if the rightmost set of characters of a column of values matches a pattern. The source value can be any data type, and the pattern can be a Pattern , regular expression, or a string.
|
Source:
The following inventory report indicates available quantities of product by product name. You need to verify that the product names are valid according to the following rules:
- A product name must begin with a three-digit numeric brand identifier, followed by a dash.
- A product name must end with a dash, followed by a six-digit numeric SKU.
Source data looks like the following, with the Validation column having no values in it.
| InvDate | ProductName | Qty | Validation |
|---|---|---|---|
| 04/21/2017 | 412-Widgets-012345 | 23 | |
| 04/21/2017 | 04-Fidgets-120341 | 66 | |
| 04/21/2017 | 204-Midgets-4421 | 31 | |
| 04/21/2017 | 593-Gidgets-402012 | 24 |
Transformation:
In this case, you must evaluate the ProductName column for two conditions. These conditional functions are the following:
IF(STARTSWITH(ProductName, `#{3}-`), 'Ok', 'Bad ProductName-Brand')
IF(ENDSWITH(ProductName, `-#{6}`), 'Ok', 'Bad ProductName-SKU')
One approach is to create two new test columns and then edit the column based on the evaluation of these two columns. However, using the following, you can compress the evaluation into a single step without creating the intermediate columns:
| Transformation Name | Edit column with formula |
|---|---|
| Parameter: Columns | Status |
| Parameter: Formula | IF(STARTSWITH(ProductName, `#{3}-`), IF(ENDSWITH(ProductName, `-#{6}`), 'Ok', 'Bad ProductName-SKU'), 'Bad ProductName-Brand') |
Results:
| InvDate | ProductName | Qty | Validation |
|---|---|---|---|
| 04/21/2017 | 412-Widgets-012345 | 23 | Ok |
| 04/21/2017 | 04-Fidgets-120341 | 66 | Bad ProductName-Brand |
| 04/21/2017 | 204-Midgets-4421 | 31 | Bad ProductName-SKU |
| 04/21/2017 | 593-Gidgets-402012 | 24 | Ok |
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