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so we have a sample database called classic models and we are working on one of its table named order details now we are going to show you how you can apply index on specific column to search quickly when those columns were searched so we are going to search by product code column and you can see that it has returned 53 records but the sequel server would have to go through a lot of records just to find these 53 in order to see that we need to use the explained clause just copy-paste this query and put explained before it now it will first show all the records from this query then it will tell how many records it has searched so it has returned 53 records and it has to go through almost 3000 rows in order to optimize this we need to use indexes first we will see how many indexes are already applied on this table so run the query show indexes from table name it has returned an empty set which means there are no indexes applied on this table yet in order to add index run the query alter
