Having Trouble with MySQL Primary Key and adding Index (Error #1064) - mysql

Question

CREATE TABLE registers(
User_ID INT UNSIGNED NOT NULL PRIMARY KEY,
IP INT UNSIGNED NOT NULL INDEX,
Success TINYINT UNSIGNED NOT NULL,
Time_Created DATETIME NOT NULL)
I get this error:
#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INDEX,
Success TINYINT UNSIGNED NOT NULL,
Time_Created DATETIME NOT NULL)' at line 3

Answer 1

To define inline indexes in a CREATE TABLE statement, you will need to place it on a separate 'create definition' line:
CREATE TABLE registers(
User_ID INT UNSIGNED NOT NULL PRIMARY KEY,
IP INT UNSIGNED NOT NULL,
INDEX(IP),
Success TINYINT UNSIGNED NOT NULL,
Time_Created DATETIME NOT NULL
);
SqlFiddle
You can also place the index definition outside of the table definition, like so:
CREATE INDEX IX_registers_ip ON registers(IP);
It is regarded as good practice to name the index, so that it can be referenced exactly.

Answer 2

Your synatx must be:
CREATE TABLE registers(
User_ID INT UNSIGNED NOT NULL PRIMARY KEY,
IP INT UNSIGNED NOT NULL ,
Success TINYINT UNSIGNED NOT NULL,
Time_Created DATETIME NOT NULL,
INDEX (IP )
)
For more information about the create table statement see the official mysql documentation

Answer 3

Try this instead - in MySQL syntax the INDEX definition cannot be included in the field definition:
CREATE TABLE registers(
User_ID INT UNSIGNED NOT NULL PRIMARY KEY,
IP INT UNSIGNED NOT NULL,
Success TINYINT UNSIGNED NOT NULL,
Time_Created DATETIME NOT NULL,
INDEX `ip_1` (`ip`)
)
Alternatively - sometimes preferred for readability you can create the index in a separate statement after you create the table:
CREATE TABLE registers(
User_ID INT UNSIGNED NOT NULL PRIMARY KEY,
IP INT UNSIGNED NOT NULL,
Success TINYINT UNSIGNED NOT NULL,
Time_Created DATETIME NOT NULL
);
CREATE INDEX ip_1 ON registers (ip);