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Sort Transform

注意

Transforms are a part of the underlying language, which is not directly accessible to users. This content is maintained for reference purposes only. For more information on the user-accessible equivalent to transforms, see Transformation Reference.

Sorts the dataset based on one or more columns in ascending or descending order. You can also sort based on the order of rows when the dataset was created.

Limitations:

注意

This transform is intended primarily for use in the Transformer page. Sort order may not be preserved in the output files.

  • If you generate a new sample after a sort transform has been applied, the sort order is not retained. You can re-apply the sort step, although the following limitations still apply.

  • Sort order is not preserved on output when the output is a multi-part file.

Basic Usage

sort order:LastName

Output: Dataset is sorted in alphabetically ascending order based on the values in the LastName column, assuming that the values are strings.

Syntax and Parameters

sort order:column_ref

Token

Required?

Data Type

Description

sort

Y

transform

Name of the transform

order

Y

string

Name of column or columns by which to sort

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

order

Identifies the column or set of columns by which the dataset is sorted.

  • Multiple column names can be separated by commas.

  • Ranges of columns cannot be specified.

The order can be reversed by adding a negative sign in front of the column name:

Transformation Name

Sort rows

Parameter: Sort by

-ProductName

Multi-column sorts: You can also specify multi-column sorts. The following example sorts first by the inverse order of ProductName and within that sort, rows are sorted by ProductColor:

Transformation Name

Sort rows

Parameter: Sort by

-ProductName,ProductColor

Sort by original row numbers: As an input value, this parameter also accepts the SOURCEROWNUMBER function, which performs the sort according to the original order of rows when the dataset was created.

Transformation Name

Sort rows

Parameter: Sort by

$sourcerownumber

See SOURCEROWNUMBER Function.

Usage Notes:

Required?

Data Type

Yes

String (column name)

Data is sorted based on the data type of the source:

Data Type of Source

Sort Order

Integer

Numerical

Decimal

Numerical

Datetime

Numerical

All others

String

Examples

提示

For additional examples, see Common Tasks.

Example - sort methods

Source:

The column without a name identifies the original row numbers. In the data grid, this information is available when you hover over the black dot to the left of a row of data.

CustId

FirstName

LastName

City

State

LastOrder

1

1001

Skip

Jones

San Francisco

CA

25

2

1002

Adam

Allen

Oakland

CA

1099

3

1003

David

Wiggins

Oakland

MI

125.25

4

1004

Amanda

Green

Detroit

MI

452.5

5

1005

Colonel

Mustard

Los Angeles

CA

950

6

1006

Pauline

Hall

Saginaw

MI

432.22

7

1007

Sarah

Miller

Cheyenne

WY

724.22

8

1008

Teddy

Smith

Juneau

AK

852.11

9

1009

Joelle

Higgins

Sacramento

CA

100

Transformation:

First, you might want to clean up the number formatting in the lastOrder column. The following formats the values to always include two digits after the decimal point:

Transformation Name

Edit column with formula

Parameter: Columns

LastOrder

Parameter: Formula

numformat(LastOrder, '####.00')

Now, you're interested in the highest value for your customers' most recent orders. You can apply the following sort:

Transformation Name

Sort rows

Parameter: Sort by

-LastOrder

Rows are sorted by the LastOrder column in descending order (largest to smallest):

CustId

FirstName

LastName

City

State

LastOrder

2

1002

Adam

Allen

Oakland

CA

1099.00

5

1005

Colonel

Mustard

Los Angeles

CA

950.00

8

1008

Teddy

Smith

Juneau

AK

852.11

7

1007

Sarah

Miller

Cheyenne

WY

724.22

4

1004

Amanda

Green

Detroit

MI

452.50

6

1006

Pauline

Hall

Saginaw

MI

432.22

3

1003

David

Wiggins

Oakland

MI

125.25

9

1009

Joelle

Higgins

Sacramento

CA

100.00

1

1001

Skip

Jones

San Francisco

CA

25.00

The above row numbers represent the original order of the rows.Now, you want to get your data geographically organized by sorting by city and state. You can perform multi-column sorts such as the following, which sorts first by State and then by City columns:

Transformation Name

Sort rows

Parameter: Sort by

State,City

In the generated output, the data is first sorted by the State value. Each set of rows within the same State value is also sorted by the City value.

CustId

FirstName

LastName

City

State

LastOrder

8

1008

Teddy

Smith

Juneau

AK

852.11

5

1005

Colonel

Mustard

Los Angeles

CA

950.00

2

1002

Adam

Allen

Oakland

CA

1099.00

9

1009

Joelle

Higgins

Sacramento

CA

100.00

1

1001

Skip

Jones

San Francisco

CA

25.00

4

1004

Amanda

Green

Detroit

MI

452.50

3

1003

David

Wiggins

Oakland

MI

125.25

6

1006

Pauline

Hall

Saginaw

MI

432.22

7

1007

Sarah

Miller

Cheyenne

WY

724.22

Example - Sort by original row numbers

This example illustrates how you can rename columns based on the contents of specified rows.

Source:

You have imported the following racer data on heat times from a CSV file. When loaded in the Transformer page, it looks like the following:

(rowId)

column2

column3

column4

column5

1

Racer

Heat 1

Heat 2

Heat 3

2

Racer X

37.22

38.22

37.61

3

Racer Y

41.33

DQ

38.04

4

Racer Z

39.27

39.04

38.85

In the above, the (rowId) column references the row numbers displayed in the data grid; it is not part of the dataset. This information is available when you hover over the black dot on the left side of the screen.

Transformation:

You have examined the best performance in each heat according to the sample. You then notice that the data contains headers, but you forget how it was originally sorted. The data now looks like the following:

(rowId)

column2

column3

column4

column5

1

Racer Y

41.33

DQ

38.04

2

Racer

Heat 1

Heat 2

Heat 3

3

Racer X

37.22

38.22

37.61

4

Racer Z

39.27

39.04

38.85

You can use the following transformation to use the third row as your header for each column:

Transformation Name

Rename column with row(s)

Parameter: Option

Use row(s) as column names

Parameter: Type

Use a single row to name columns

Parameter: Row number

3

Results:

After you have applied the above transformation, your data should look like the following:

(rowId)

Racer

Heat_1

Heat_2

Heat_3

3

Racer Y

41.33

DQ

38.04

2

Racer X

37.22

38.22

37.61

4

Racer Z

39.27

39.04

38.85