SQL Create Database, Table, and Index

Create a Database

To create a database:

CREATE DATABASE database_name

Create a Table

To create a table in a database:

CREATE TABLE table_name
(
column_name1 data_type,
column_name2 data_type,
.......
)

Example

This example demonstrates how you can create a table named "Person", with four columns. The column names will be "LastName", "FirstName", "Address", and "Age":

CREATE TABLE Person 
(
LastName varchar,
FirstName varchar,
Address varchar,
Age int
)

This example demonstrates how you can specify a maximum length for some columns:

CREATE TABLE Person 
(
LastName varchar(30),
FirstName varchar,
Address varchar,
Age int(3) 
)

The data type specifies what type of data the column can hold. The table below contains the most common data types in SQL:

Create Index

Indices are created in an existing table to locate rows more quickly and efficiently. It is possible to create an index on one or more columns of a table, and each index is given a name. The users cannot see the indexes, they are just used to speed up queries. 

A Unique Index

Creates a unique index on a table. A unique index means that two rows cannot have the same index value.

CREATE UNIQUE INDEX index_name
ON table_name (column_name)

The "column_name" specifies the column you want indexed.

A Simple Index

Creates a simple index on a table. When the UNIQUE keyword is omitted, duplicate values are allowed.

CREATE INDEX index_name
ON table_name (column_name)

The "column_name" specifies the column you want indexed.

Example

This example creates a simple index, named "PersonIndex", on the LastName field of the Person table:

CREATE INDEX PersonIndex
ON Person (LastName)

If you want to index the values in a column in descending order, you can add the reserved word DESC after the column name:

CREATE INDEX PersonIndex
ON Person (LastName DESC)

If you want to index more than one column you can list the column names within the parentheses, separated by commas:

CREATE INDEX PersonIndex
ON Person (LastName, FirstName)

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