How to set AUTO_INCREMENT from another table

问题

How can I set the AUTO_INCREMENT on CREATE TABLE or ALTER TABLE from another table?

I found this question, but not solved my issue: How to Reset an MySQL AutoIncrement using a MAX value from another table?

I also tried this:

CREATE TABLE IF NOT EXISTS `table_name` (
  `id` mediumint(6) unsigned NOT NULL AUTO_INCREMENT,
  `columnOne` tinyint(1) NOT NULL,
  `columnTwo` int(12) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=(SELECT `AUTO_INCREMENT` FROM  `INFORMATION_SCHEMA`.`TABLES` WHERE `TABLE_SCHEMA` = 'database_name' AND `TABLE_NAME` = 'another_table_name');

this:

ALTER TABLE `table_name` AUTO_INCREMENT=(SELECT `AUTO_INCREMENT` FROM  `INFORMATION_SCHEMA`.`TABLES` WHERE `TABLE_SCHEMA` = 'database_name' AND `TABLE_NAME` = 'another_table_name');

this:

CREATE TABLE IF NOT EXISTS `table_name` (
  `id` mediumint(6) unsigned NOT NULL AUTO_INCREMENT,
  `columnOne` tinyint(1) NOT NULL,
  `columnTwo` int(12) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=(SELECT (MAX(`id`)+1) FROM `another_table_name`);

and this:

ALTER TABLE `table_name` AUTO_INCREMENT=(SELECT (MAX(`id`)+1) FROM `another_table_name`);

回答1:

This code will create procedure for you:

CREATE PROCEDURE `tbl_wth_ai`(IN `ai_to_start` INT)
BEGIN

SET @s=CONCAT('CREATE TABLE IF NOT EXISTS `table_name` (
  `id` mediumint(6) unsigned NOT NULL AUTO_INCREMENT,
  `columnOne` tinyint(1) NOT NULL,
  `columnTwo` int(12) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT = ', `ai_to_start`);

  PREPARE stmt FROM @s;
  EXECUTE stmt;
  DEALLOCATE PREPARE stmt;
END;

Then you may call CALL tbl_wth_ai(2); passing the parameter inside the brackets.

For example:

CALL tbl_wth_ai((SELECT id FROM `ttest` WHERE c1='b'));

回答2:

This works fine:

DELIMITER $$
CREATE PROCEDURE `tbl_wth_ai`(IN `ai_to_start` INT)
BEGIN

SET @s=CONCAT('CREATE TABLE IF NOT EXISTS `table_name` (
  `id` mediumint(6) unsigned NOT NULL AUTO_INCREMENT,
  `columnOne` tinyint(1) NOT NULL,
  `columnTwo` int(12) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT = ', `ai_to_start`);

  PREPARE stmt FROM @s;
  EXECUTE stmt;
  DEALLOCATE PREPARE stmt;
END $$
DELIMITER ;

CALL tbl_wth_ai((SELECT MAX(`id`)+1 FROM `another_table_name`));
DROP PROCEDURE IF EXISTS tbl_wth_ai;

回答3:

SELECT `AUTO_INCREMENT` INTO @AutoInc
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_SCHEMA = 'my_db' AND TABLE_NAME = 'old_table';

SET @s:=CONCAT('ALTER TABLE `my_db`.`new_table` AUTO_INCREMENT=', @AutoInc);
PREPARE stmt FROM @s;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

来源：https://stackoverflow.com/questions/32550239/how-to-set-auto-increment-from-another-table

标签

mysql

auto-increment

create-table

alter-table