Query to find Skew factor of particular table

1. SELECT
2. TABLENAME,
3. SUM(CURRENTPERM) /(1024*1024) AS CURRENTPERM,
4. (100 - (AVG(CURRENTPERM)/MAX(CURRENTPERM)*100)) AS SKEWFACTOR
5. FROM
6. DBC.TABLESIZE
7. WHERE DATABASENAME= <DATABASENAME>
8. AND
9. TABLENAME =<TABLENAME>
10. GROUP BY 1;