Drop Transform

Tips:

• This transform might be automatically applied as one of the first steps of your recipe. See Initial Parsing Steps.
• If you want to hide a column from view, select Hide from the column drop-down. Note that the data can still be referenced in your transforms and appears in any generated output. See Transformer Page.
• If you are working with large datasets, you might want to drop columns at the beginning of your recipe, which can assist application and job execution performance. Use the tilde operator to drop ranges of columns.
• You can also specify the columns that you wish to retain and then add the Keep action to drop all other columns in the dataset.

Basic Usage

Single-column example:

drop col:ThisOldColumn action: Drop

Output: Drops the column named ThisOldColumn.

Multi-column example:

You can specify comma-separated sets of columns. 

drop col: FirstName, MiddleInitial action: Drop

Output: Drops the columns FirstName and MiddleInitial from your dataset.

Keep example:

The following transform keeps the listed columns and drops all others in the dataset:

drop col: FirstName, MiddleInitial action: Keep

Column range example:

You can also specify ranges of columns using the tilde (~) operator:

drop col:Column1~Column20 action: Drop

Output: Drops the columns Column1 and Column20 and all columns displayed in between them in the data grid.

Syntax and Parameters

drop col:column_ref action: [Drop|Keep]

For more information on syntax standards, see Language Documentation Syntax Notes.

col

Identifies the column or columns to which to apply the transform. You can specify one column or more columns.

To specify multiple columns:

• Discrete column names are comma-separated. 
• Values for column names are case-sensitive.

Usage Notes:

action

Identifies whether the action performed by the transform:

• Drop - Listed columns are dropped from the dataset.
• Keep - Listed columns are retained in the dataset, and all other columns are dropped.

Usage Notes:

Examples

See above.