SQL Server中的MySQL INDEX（）语法等效

Question

I am following a PHP workbook and one of the exercises asks me to create a table with columns using the following MySQL code

CREATE TABLE messages ( 
    message_id INT UNSIGNED NOT NULL AUTO_INCREMENT, 
    parent_id INT UNSIGNED NOT NULL DEFAULT 0, 
    forum_id TINYINT UNSIGNED NOT NULL, 
    user_id MEDIUMINT UNSIGNED NOT NULL, 
    subject VARCHAR(100) NOT NULL,
    body LONGTEXT NOT NULL, 
    date_entered DATETIME NOT NULL, 
    PRIMARY KEY (message_id), 
    INDEX (parent_id), 
    INDEX (forum_id),
    INDEX (user_id),
    INDEX (date_entered) 
);

The problem is at the place I work they use Microsoft SQL Server so the syntax is different.

What is the equivalent SQL Server syntax I can use for

INDEX (parent_id), 
INDEX (forum_id),
INDEX (user_id),
INDEX (date_entered)

Answer 1

What is the equivalent SQL Server syntax I can use for

 INDEX (parent_id), 
 INDEX (forum_id),
 INDEX (user_id),
 INDEX (date_entered)

Looking in the manual i notice the BNF form.

<column_index> ::=   
 INDEX index_name [ CLUSTERED | NONCLUSTERED ]  
    [ WITH ( <index_option> [ ,... n ] ) ]  
    [ ON { partition_scheme_name (column_name )   
         | filegroup_name  
         | default   
         }  
    ]   
    [ FILESTREAM_ON { filestream_filegroup_name | partition_scheme_name | "NULL" } ]  

So SQL Server 2008+ should also support INDEX keyword in the CREATE TABLE statement..

But the valid syntax for the INDEX keyword is using

CREATE TABLE test ( 
   id INT
 , INDEX index_name (id)
);

But there are other things wrong like datatypes or keywords..

The correct SQL code for SQL server is

CREATE TABLE messages ( 
 message_id INT identity(1, 1), 
 parent_id INT NOT NULL DEFAULT 0, 
 forum_id TINYINT NOT NULL, 
 user_id INT NOT NULL, 
 subject VARCHAR(100) NOT NULL,
 body TEXT NOT NULL, 
 date_entered DATETIME NOT NULL, 
 PRIMARY KEY (message_id), 
 INDEX parent_id (parent_id), 
 INDEX forum_id (forum_id),
 INDEX user_id (user_id),
 INDEX date_entered (date_entered) 
);

Answer 2

You can use syntax that should work in any SQL engine, eg

CREATE TABLE messages ( 
    message_id INT, 
    parent_id INT NOT NULL DEFAULT 0, 
    forum_id TINYINT NOT NULL, 
    user_id INT NOT NULL, 
    subject VARCHAR(100) NOT NULL,
    body TEXT NOT NULL, 
    date_entered DATETIME NOT NULL, 
    PRIMARY KEY (message_id)
)

Then create other indexes individually:

CREATE INDEX parent_id_idx ON messages (parent_id))

And so on.

This syntax should be supported by all SQL engines.