Similarly let us assume that the Job of the Employees is divided into 4 categories only i.e Manager, Analyst, Clerk, and Salesman. Such columns are called columns with low cardinality. 2、 SELECT * FROM Employee WHERE New_Emp = "No" and Job = "Salesperson"; Bitmap Indexing in DBMS - ...
Tree-structuredindexingtechniquessupportbothrangeselectionsandequalityselections. ISAM:staticstructure;earlyindextechnology. B+tree:dynamic,adjustsgracefullyunderinsertsanddeletes. RangeSearches ``Findallstudentswithgpa>3.0’’ Ifdataisinsortedfile,dobinarysearchtofindfirstsuchstudent,thenscantofindothers. ...