What Is Index Covering?

1.	What Is Index Covering?
Answer» When all the keys of non-clustered index are used in SELECT statement and also in where CLAUSE then the non-clustered index does not need to go to LAST level of index it just pick the data from leaf-level so it takes less TIME to execute the QUERY this is called Index-Covering. When all the keys of non-clustered index are used in select statement and also in where clause then the non-clustered index does not need to go to last level of index it just pick the data from leaf-level so it takes less time to execute the query this is called Index-Covering.

Answer»

When all the keys of non-clustered index are used in SELECT statement and also in where CLAUSE then the non-clustered index does not need to go to LAST level of index it just pick the data from leaf-level so it takes less TIME to execute the QUERY this is called Index-Covering.

When all the keys of non-clustered index are used in select statement and also in where clause then the non-clustered index does not need to go to last level of index it just pick the data from leaf-level so it takes less time to execute the query this is called Index-Covering.

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