Hello all, Another question on cardinality.
Consider a table with 1000 rows and columnns. Details of the columns are as below: FLD_1 - int - cardinality 1000 - PRIMARY KEY FLD_2 - tinyint- cardinality 400 FLD_3 - varchar - cardinality 10 FLD_4 - varchar - cardinality 2 FLD_5 - varchar - cardinality 5 Assuming that cardinality exactly is the number of distinct values for that column, Which are the fields that is best for indexing for the table. Is it meaningful for me to index FLD_3, FLD_4 and FLD_5 knowing that their cardinality is always going to be the same? There are certain scenarios wherein I have queries on the tables as below: 1) Select * from table where FLD_4 = 1; 2) Select * from table where FLD_5 = 3; 3) Select * from table where FLD_3 >1 AND FLD_5 < 6; considering all the above cases, what should I conclude? should I have indexes on these three fields? Looking for a specific answer than a "depend on situation" kind of an answer. Thanks Ratheesh Bhat K J
