MySQL Server Error 1005 - mysql

Question

When I try to run SQL script I get the log error in Workbench Forward Engineer:
Executing SQL script in server
ERROR: Error 1005: Can't create table 'regional_budget.budget' (errno: 121)
SQL Code:
-- -----------------------------------------------------
-- Table `regional_budget`.`budget`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `regional_budget`.`budget` (
`id` INT(3) NOT NULL AUTO_INCREMENT,
`region_id` INT(3) NOT NULL,
`balance` DECIMAL(11,2) NULL,
`income_id` INT(3) NOT NULL,
`income` DECIMAL(11,2) NULL,
`outcome_id` INT(3) NOT NULL,
`outcome` DECIMAL(11,2) NULL,
PRIMARY KEY (`id`),
INDEX `region_id_idx` (`region_id` ASC),
INDEX `outcome_id_idx` (`outcome_id` ASC),
INDEX `income_id_idx` (`income_id` ASC),
CONSTRAINT `region_id`
FOREIGN KEY (`region_id`)
REFERENCES `regional_budget`.`regions` (`id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION,
CONSTRAINT `income_id`
FOREIGN KEY (`income_id`)
REFERENCES `regional_budget`.`income` (`id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION,
CONSTRAINT `outcome_id`
FOREIGN KEY (`outcome_id`)
REFERENCES `regional_budget`.`outcome` (`id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION)
ENGINE = InnoDB
SQL script execution finished: statements: 13 succeeded, 1 failed
Fetching back view definitions in final form.
Nothing to fetch
SQL script:
-- MySQL Workbench Forward Engineering
SET #OLD_UNIQUE_CHECKS=##UNIQUE_CHECKS, UNIQUE_CHECKS=0;
SET #OLD_FOREIGN_KEY_CHECKS=##FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0;
SET #OLD_SQL_MODE=##SQL_MODE, SQL_MODE='TRADITIONAL,ALLOW_INVALID_DATES';
-- -----------------------------------------------------
-- Schema regional_budget
-- -----------------------------------------------------
-- -----------------------------------------------------
-- Schema regional_budget
-- -----------------------------------------------------
CREATE SCHEMA IF NOT EXISTS `regional_budget` DEFAULT CHARACTER SET utf8 ;
USE `regional_budget` ;
-- -----------------------------------------------------
-- Table `regional_budget`.`regions`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `regional_budget`.`regions` (
`id` INT NOT NULL AUTO_INCREMENT,
`name` VARCHAR(20) NULL,
PRIMARY KEY (`id`))
ENGINE = InnoDB;
-- -----------------------------------------------------
-- Table `regional_budget`.`subjects`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `regional_budget`.`subjects` (
`id` INT NOT NULL,
`name` VARCHAR(20) NULL,
`region_id` INT NULL,
PRIMARY KEY (`id`),
INDEX `region_id_idx` (`region_id` ASC),
CONSTRAINT `region_id`
FOREIGN KEY (`region_id`)
REFERENCES `regional_budget`.`regions` (`id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION)
ENGINE = InnoDB;
-- -----------------------------------------------------
-- Table `regional_budget`.`income`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `regional_budget`.`income` (
`id` INT NOT NULL AUTO_INCREMENT,
`tax_and_non_tax` DECIMAL(11,2) NULL,
`receipts` DECIMAL(11,2) NULL,
PRIMARY KEY (`id`))
ENGINE = InnoDB;
-- -----------------------------------------------------
-- Table `regional_budget`.`outcome`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `regional_budget`.`outcome` (
`id` INT NOT NULL AUTO_INCREMENT,
`transfers` DECIMAL(11,2) NULL,
`subventions` DECIMAL(11,2) NULL,
`subsidies` DECIMAL(11,2) NULL,
`dotations` DECIMAL(11,2) NULL,
PRIMARY KEY (`id`))
ENGINE = InnoDB;
-- -----------------------------------------------------
-- Table `regional_budget`.`population`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `regional_budget`.`population` (
`subject_id` INT NOT NULL,
`count` DECIMAL(11,2) NULL,
PRIMARY KEY (`subject_id`),
CONSTRAINT `subject_id`
FOREIGN KEY (`subject_id`)
REFERENCES `regional_budget`.`subjects` (`id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION)
ENGINE = InnoDB;
SET SQL_MODE=#OLD_SQL_MODE;
SET FOREIGN_KEY_CHECKS=#OLD_FOREIGN_KEY_CHECKS;
SET UNIQUE_CHECKS=#OLD_UNIQUE_CHECKS;
-- -----------------------------------------------------
-- Table `regional_budget`.`budget`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `regional_budget`.`budget` (
`id` INT(3) NOT NULL AUTO_INCREMENT,
`region_id` INT(3) NOT NULL,
`balance` DECIMAL(11,2) NULL,
`income_id` INT(3) NOT NULL,
`income` DECIMAL(11,2) NULL,
`outcome_id` INT(3) NOT NULL,
`outcome` DECIMAL(11,2) NULL,
PRIMARY KEY (`id`),
INDEX `region_id_idx` (`region_id` ASC),
INDEX `outcome_id_idx` (`outcome_id` ASC),
INDEX `income_id_idx` (`income_id` ASC),
CONSTRAINT `region_id`
FOREIGN KEY (`region_id`)
REFERENCES `regional_budget`.`regions` (`id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION,
CONSTRAINT `income_id`
FOREIGN KEY (`income_id`)
REFERENCES `regional_budget`.`income` (`id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION,
CONSTRAINT `outcome_id`
FOREIGN KEY (`outcome_id`)
REFERENCES `regional_budget`.`outcome` (`id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION)
ENGINE = InnoDB;
P.S. I tried to create 'regional_budget'.'budget' with foreign keys after other reference tables. Also I tried to use foreign_key_checks, but nothing helps.

Answer 1

I suggest you try changing the identifiers of the foreign key constraints to be unique, and not conflict with identifiers already used for columns (or other constraints.
For example:
CONSTRAINT `FK_budget_regions` FOREIGN KEY ...
CONSTRAINT `FK_budget_income` FOREIGN KEY ...
CONSTRAINT `FK_budget_outcome` FOREIGN KEY ...