SQL CREATE INDEX Statement

 

SQL CREATE INDEX 

SQL CREATE INDEX 

INDEX is used to create and retrieve data from the database very quickly. A list can be created using one or a group of columns in a table. When the index is created, it is assigned a ROWID for each line before it sorts the data. 

Appropriate lists are good for exhibitions in large databases, but you need to be judicious when creating a record. A selection of fields depends on what you use in your SQL queries.

The CREATE INDEX statement is used to create lists in the tables. 

Records are used to recover database data in addition to quickly than otherwise. Users can't see the queues, they're just used to speed up searches/requests. 

Note: 

Updating a scene with a file takes in addition to time as updating a table without (vehicle lists also need an update). Thus, only create records on columns that will be frequently searched against.

Example :

Standard example, the following SQL syntax creates a new table called CLIENTS and adds five columns.

CREATE TABLE CLIENTS(

Id number NOT NULL,

Name Varchar2(20) NOT NULL,

Age number NOT NULL,

Address varchar2(20),

Salary varchar2(20),

Constraint pk_client Primary Key(Id));

Now you can create a list on a special or different column using the syntax given below.

Syntax:

Makes a record on a table. Copy esteems are permitted:

CREATE INDEX index_name ON table_name (Column1 , Column2 , Column 3 , .......);

Example :

The SQL explanation beneath makes a file named "idx_lastName" on the "LastName" segment in the "People" table:

CREATE  INDEX  idx_lastname  ON  People  (lastName);

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