SQL Index |Indexes in SQL|Database Index(Code Included)|How to Speed up SQL query|
SQL Index |Indexes in SQL|Database Index(Code Included)|How to Speed up SQL query
#CTTUTORIAL #SQL #INDEXES #DBMS
Indexes in SQL are used to speed up SQL queries. A database index works much like an index in a book. For example, if you have a database table with a list of people, a common query would be to lookup someone by name. Creating an index means the database will not have to scan the entire table looking for matches. Instead, it will restrict its search to a small portion of the rows.
Code:
CREATE INDEX index_name
ON table_name (column1, column2, ...);
CREATE UNIQUE INDEX index_name
ON table_name (column1, column2, ...);
CREATE INDEX idx_lastname
ON Persons (LastName);
ALTER TABLE table_name
DROP INDEX index_name;
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