LAST_INSERT_ID() Function in MySQL

LAST_INSERT_ID() function in MySQL is used to find the last row’s AUTO_INCREMENT id which is being included or revised in a table.

Features :

• This function is used to find the last row’s AUTO_INCREMENT id.
• This function comes under Advanced Functions.
• This function accepts only one parameter namely expression.

Syntax :

LAST_INSERT_ID(expression)

Parameter :

This method accepts only one parameter is given below:

• Expression: Specified expression which may be optional.

Returns :

It returns the last row’s AUTO_INCREMENT id of the stated table.

Now we see some examples of the LAST_INSERT_ID() Function in MySQL.

Example 1 :

Using LAST_INSERT_ID() function and getting the output.

Query:

SELECT LAST_INSERT_ID();

Output :

Here, notable is specified so the last insert id is zero.

Example 2 :

Using LAST_INSERT_ID() function and finding the last insert id of the table of float values.

Query:

CREATE TABLE floats13
(  
user_id int NOT NULL AUTO_INCREMENT,  
float_val float,
PRIMARY KEY(user_id)  
);
INSERT floats13(float_val)  
VALUES (1.2);

INSERT floats13(float_val)  
VALUES (2.1);

INSERT floats13(float_val)  
VALUES (6.3);

INSERT floats13(float_val)  
VALUES (9.0);

INSERT floats13(float_val)  
VALUES (7.0);

SELECT LAST_INSERT_ID();

Output :

Example 3 :

Using LAST_INSERT_ID() function and getting the last insert id for a table of 3 columns.

Query:

CREATE TABLE package33
(  
user_id int NOT NULL AUTO_INCREMENT,  
item VARCHAR(10),
mrp int,
PRIMARY KEY(user_id)  
);
INSERT package33(item, mrp)  
VALUES ('book1', 250);

INSERT package33(item, mrp)  
VALUES ('book2', 500);

INSERT package33(item, mrp)  
VALUES ('book3', 750);

SELECT LAST_INSERT_ID();

Output :

Example 4 :

Using LAST_INSERT_ID() function and getting the last insert id of all the 3 variables.

Query:

CREATE TABLE package15
(  
user_id int NOT NULL AUTO_INCREMENT,  
item VARCHAR(10),
mrp int,
sp int,
PRIMARY KEY(user_id)
);

INSERT package15(item, mrp, sp)  
VALUES ('book1', 250, 240);

INSERT package15(item, mrp, sp)  
VALUES ('book2', 350, 320);

INSERT package15(item, mrp, sp)  
VALUES ('book3', 400, 350);

SELECT LAST_INSERT_ID() FROM package15;

Output :

This function is used to find the last row’s AUTO_INCREMENT id.