VALUE + max（ID）+1内的MySQL SELECT

Question

Any idea how can I change max(ID)+1 to select the highest auto increment value from wp_post table. I want to make sure I can choose equivalent of max(ID)+1

INSERT INTO `wp_posts`(`ID`, `post_author`, `post_title`, `post_status`, `comment_status`,`post_type`)
    VALUES ((SELECT max(ID)+1 FROM wp_posts),1,'name lastname', 'publish', 'closed', 'post_type');

Above query has an error, cos it's not possible to select max+1 from the same table where an INSERT statement is set up.

Answer 1

You suggest that id is auto-incremented. If not, then it should be. Then you would write the statement as:

INSERT INTO `wp_posts`(`post_author`, `post_title`, `post_status`,
                       `comment_status`,`post_type`)
    VALUES (1, 'name lastname', 'publish', 'closed', 'post_type');

Answer 2

Like Gordon Linoff says use ID as auto-increment here is create table example..

CREATE TABLE wp_posts
(
ID int NOT NULL AUTO_INCREMENT,
post_author varchar(255) NOT NULL,
post_title varchar(255),
post_status varchar(255),
comment_status varchar(255),
post_type varchar(255),
PRIMARY KEY (ID)
)

Than you can insert as Gordon mentioned..

INSERT INTO `wp_posts`(`post_author`, `post_title`, `post_status`,
                       `comment_status`,`post_type`)
    VALUES (1, 'name lastname', 'publish', 'closed', 'post_type');

Answer 3

Use auto-increment .

The AUTO_INCREMENT attribute can be used to generate a unique identity for new rows.

Answer 4

You can add an auto increment to an existing table to achieve what you are trying to do. ALTER TABLE wp_posts MODIFY id int(11) AUTO_INCREMENT;

Answer 5

set @ID=(SELECT if(max(id) is null,1, max(id)+1) FROM wp_posts);

INSERT INTO wp_posts ( ID , post_author , post_title , post_status , comment_status , post_type ) VALUES (@ID,1,'name lastname', 'publish', 'closed', 'post_type');