SELECT phone_number FROM employees WHERE salary BETWEEN 8000 AND 12000
what is the phone number of employees whose salary is in the range of 8000 and 12000?
CREATE TABLE IF NOT EXISTS `regions` (
  `REGION_ID` decimal(5,0) NOT NULL,
  `REGION_NAME` varchar(25) DEFAULT NULL,
  PRIMARY KEY (`REGION_ID`)
);
CREATE TABLE IF NOT EXISTS `countries` (
  `COUNTRY_ID` varchar(2) NOT NULL,
  `COUNTRY_NAME` varchar(40) DEFAULT NULL,
  `REGION_ID` decimal(10,0) DEFAULT NULL,
  PRIMARY KEY (`COUNTRY_ID`),
  FOREIGN KEY (`REGION_ID`) REFERENCES regions (`REGION_ID`)
);
CREATE TABLE IF NOT EXISTS `departments` (
  `DEPARTMENT_ID` decimal(4,0) NOT NULL DEFAULT '0',
  `DEPARTMENT_NAME` varchar(30) NOT NULL,
  `MANAGER_ID` decimal(6,0) DEFAULT NULL,
  `LOCATION_ID` decimal(4,0) DEFAULT NULL,
  PRIMARY KEY (`DEPARTMENT_ID`)
);
CREATE TABLE IF NOT EXISTS `jobs` (
  `JOB_ID` varchar(10) NOT NULL DEFAULT '',
  `JOB_TITLE` varchar(35) NOT NULL,
  `MIN_SALARY` decimal(6,0) DEFAULT NULL,
  `MAX_SALARY` decimal(6,0) DEFAULT NULL,
  PRIMARY KEY (`JOB_ID`)
);
CREATE TABLE IF NOT EXISTS `employees` (
  `EMPLOYEE_ID` decimal(6,0) NOT NULL DEFAULT '0',
  `FIRST_NAME` varchar(20) DEFAULT NULL,
  `LAST_NAME` varchar(25) NOT NULL,
  `EMAIL` varchar(25) NOT NULL,
  `PHONE_NUMBER` varchar(20) DEFAULT NULL,
  `HIRE_DATE` date NOT NULL,
  `JOB_ID` varchar(10) NOT NULL,
  `SALARY` decimal(8,2) DEFAULT NULL,
  `COMMISSION_PCT` decimal(2,2) DEFAULT NULL,
  `MANAGER_ID` decimal(6,0) DEFAULT NULL,
  `DEPARTMENT_ID` decimal(4,0) DEFAULT NULL,
  PRIMARY KEY (`EMPLOYEE_ID`),
  FOREIGN KEY (`DEPARTMENT_ID`) REFERENCES departments(`DEPARTMENT_ID`),
  FOREIGN KEY (`JOB_ID`) REFERENCES jobs(`JOB_ID`)
);
CREATE TABLE IF NOT EXISTS `job_history` (
  `EMPLOYEE_ID` decimal(6,0) NOT NULL,
  `START_DATE` date NOT NULL,
  `END_DATE` date NOT NULL,
  `JOB_ID` varchar(10) NOT NULL,
  `DEPARTMENT_ID` decimal(4,0) DEFAULT NULL,
  PRIMARY KEY (`EMPLOYEE_ID`,`START_DATE`),
  FOREIGN KEY (`EMPLOYEE_ID`) REFERENCES employees(`EMPLOYEE_ID`),
  FOREIGN KEY (`DEPARTMENT_ID`) REFERENCES departments(`DEPARTMENT_ID`),
  FOREIGN KEY (`JOB_ID`) REFERENCES jobs(`JOB_ID`)
);
CREATE TABLE IF NOT EXISTS `locations` (
  `LOCATION_ID` decimal(4,0) NOT NULL DEFAULT '0',
  `STREET_ADDRESS` varchar(40) DEFAULT NULL,
  `POSTAL_CODE` varchar(12) DEFAULT NULL,
  `CITY` varchar(30) NOT NULL,
  `STATE_PROVINCE` varchar(25) DEFAULT NULL,
  `COUNTRY_ID` varchar(2) DEFAULT NULL,
  PRIMARY KEY (`LOCATION_ID`),
  FOREIGN KEY (`COUNTRY_ID`) REFERENCES countries(`COUNTRY_ID`)
);
INSERT INTO `regions` (`REGION_ID`, `REGION_NAME`) VALUES
INSERT INTO `countries` (`COUNTRY_ID`, `COUNTRY_NAME`, `REGION_ID`) VALUES
INSERT INTO `departments` (`DEPARTMENT_ID`, `DEPARTMENT_NAME`, `MANAGER_ID`, `LOCATION_ID`) VALUES
INSERT INTO `jobs` (`JOB_ID`, `JOB_TITLE`, `MIN_SALARY`, `MAX_SALARY`) VALUES
INSERT INTO `employees` (`EMPLOYEE_ID`, `FIRST_NAME`, `LAST_NAME`, `EMAIL`, `PHONE_NUMBER`, `HIRE_DATE`, `JOB_ID`, `SALARY`, `COMMISSION_PCT`, `MANAGER_ID`, `DEPARTMENT_ID`) VALUES
INSERT INTO `job_history` (`EMPLOYEE_ID`, `START_DATE`, `END_DATE`, `JOB_ID`, `DEPARTMENT_ID`) VALUES
INSERT INTO `locations` (`LOCATION_ID`, `STREET_ADDRESS`, `POSTAL_CODE`, `CITY`, `STATE_PROVINCE`, `COUNTRY_ID`) VALUES