what is subset ratio? in qlikview

[#1]

Please tell me any one to this answer it

[MK_QSL]

Information density of the field, which indicates the percentage of rows that contain a non-null value

Subset ratio, which shows the percentage of all distinct values for a field in the

table compared to all the distinct values for that field in the entire data model. It is

only relevant for key fields since they are present in multiple tables and do not all

share the same value.

Subset ratios can be used to easily spot problems in key field

associations.

     For example, when the combined total of subset ratios for multiple

tables is 100 percent, this may indicate that there are no matching keys between

these tables.

REF: QlikView 11 For Developers..

Let me give you simple example

Sales:

Load * Inline

[

  Customer, Sales

  A, 100

  B, 200

  D, 300

];

Customer:

Load * Inline

[

  Customer

  A

  B

  C

  D

];

If you write above sample script and will check the Table (CTRL + T), you will find two tables.

Sales and Customers

On Sales Table, if you hover the mouse on Customer field, you can see the Subset Ratio is 75% because there is not sales data for Customer C.

Now if you change the script for table Customer like below..

Customer:

Load * Inline

[

  Customer

  A

  B

  C

  D

]

Where Exists (Customer);

If will not load the Customer C as there are no sales data for the same.

Now check the Subset Ratio. It will be 100%.

If subset ratio is less than 100%, the key is called as Primary Key

but for 100% it is called as Perfect Key.

[AbhijitBansode]

Much important explanation in much simple way.. great job Manish.

[#4]

Thanks manish..

[MK_QSL]

Kindly close the thread by selecting appropriate (Correct/Helpful) answer...

[SunilChauhan]

• Information density: This displays the percentage of rows in the table with values (none are null).
• Subset ratio: This displays the percentage of distinct values in this table for this data field (out of all possible distinct values for the data field contained in all tables).
• Field comments (if any): These are added by the use of the Comment Field statement, as follows:Comment fieldname with 'any comment';
• Field tags: These may be auto-populated from the system (denoted by a ...