CREATE and DROP INDEX Statement in SQL

1. CREATE INDEX Statement :
The CREATE INDEX statement will create indexes in tables. Indexes are used for data procurement from the databases faster. The users cannot see the indexes, they are running in the background of queries, used to speed up searches/queries.

Syntax :
Create an index on a table :

CREATE INDEX indexname
ON tablename (columnname1, columnname2, ...);

Create a unique index on a table –

CREATE UNIQUE INDEX indexname
ON tablename (columnname1, columnname2, ...);

Example –
Below SQL statement would create an index named “idx_name” on the “LastName” column in the “GeeksTab” table –

CREATE INDEX idx_name
ON GeeksTab (LastName);

To create an index on multiple columns –



CREATE INDEX idx_pname
ON GeeksTab (LastName, FirstName);


2. DROP INDEX Statement :
The DROP INDEX statement could be used to remove an index from any table.

Syntax :

DROP INDEX tablename.indexname;

Example –

DROP INDEX GeeksTab.idx_pname;

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