With that said and given that we know our table has very few records that satisfy the WHERE condition let's flip it to an equality operator and see the difference in performance. Looking at the explain plan for this query we can see that it's also doing an index seek but looking deeper into the Seek Predicate we can now see it's using the equality operator which should be much faster given the number of records that satisfy the WHERE condition.
The ALTER TABLE statement specifies EMPLOYEES as the table to alter.
The MODIFY clause permanently modifies the format of the Salary column.
We can see below that the example using the equality operator runs faster and requires much less resources.
The Oracle UPDATE statement is used to update existing records in a table in an Oracle database.
It is important to note that grouping is conceptual; the table is not physically rearranged. This is especially true if the expression will fold multiple values together, such as dividing a number by 1000 to group quantities together if they are in the same 1000.
If you select SALARY, and clause is normally used along with five built-in, or "aggregate" functions.The DROP clause permanently drops the Phone column.Maria DB stores an IS_UPDATABLE flag with each view, so it is always possible to see if Maria DB considers a view updatable (although not necessarily insertable) by querying the IS_UPDATABLE column in the INFORMATION_SCHEMA. The WITH CHECK OPTION clause is used to prevent updates or inserts to views unless the WHERE clause in the SELECT statement is true. WITH LOCAL CHECK OPTION restricts the CHECK OPTION to only the view being defined, while WITH CASCADED CHECK OPTION checks all underlying views as well.(The two underscores represent any character.) The CASE expression returns a value for each row that completes the SET clause.Modify the format of the Salary column and delete the Phone column.Both have been changed to use separate Although the changes that the optimizer has made have certainly helped the query by avoiding an index scan it's always best to use an equality operator, like = or IN, in you query if you want the best performance possible.