已知数据如下： 7369,SMITH,CLERK,7902,1980-12-17,800,null,20 7499,ALLEN,SALESMAN,7698,1981-02-20,1600,300,30 7521,WARD,SALESMAN,7698,1981-02-22,1250,500,30 7566,JONES,MANAGER,7839,1981-04-02,2975,null,20 7654,MARTIN,SALESMAN,7698,1981-09-28,1250,1400,30 7698,BLAKE,MANAGER,7839,1981-05-01,2850,null,30 7782,CLARK,MANAGER,7839,1981-06-09,2450,null,10 7788,SCOTT,ANALYST,7566,1987-04-19,3000,null,20 7839,KING,PRESIDENT,null,1981-11-17,5000,null,10 7844,TURNER,SALESMAN,7698,1981-09-08,1500,0,30 7876,ADAMS,CLERK,7788,1987-05-23,1100,null,20 7900,JAMES,CLERK,7698,1981-12-03,950,null,30 7902,FORD,ANALYST,7566,1981-12-02,3000,null,20 7934,MILLER,CLERK,7782,1982-01-23,1300,null,10 使用mr程序统计每年入职的人数。 最终结果要求如下： 1. 格式如下： 年份：1980 人数:xxx 年份：1981 人数:xxx ....... 2. 两个分区： 0分区存储 入职年份<1982年的 1分区存储 入职年份>=1982年的

以下是可以用于统计每年入职人数的SQL查询语句：

-- 创建表格
CREATE TABLE emp (
  empno NUMBER(4) PRIMARY KEY,
  ename VARCHAR2(10),
  job VARCHAR2(9),
  mgr NUMBER(4),
  hiredate DATE,
  sal NUMBER(7,2),
  comm NUMBER(7,2),
  deptno NUMBER(2)
);

-- 插入数据
INSERT INTO emp VALUES (7369,'SMITH','CLERK',7902,to_date('12-17-1980','MM-DD-YYYY'),800,null,20);
INSERT INTO emp VALUES (7499,'ALLEN','SALESMAN',7698,to_date('02-20-1981','MM-DD-YYYY'),1600,300,30);
INSERT INTO emp VALUES (7521,'WARD','SALESMAN',7698,to_date('02-22-1981','MM-DD-YYYY'),1250,500,30);
INSERT INTO emp VALUES (7566,'JONES','MANAGER',7839,to_date('04-02-1981','MM-DD-YYYY'),2975,null,20);
INSERT INTO emp VALUES (7654,'MARTIN','SALESMAN',7698,to_date('09-28-1981','MM-DD-YYYY'),1250,1400,30);
INSERT INTO emp VALUES (7698,'BLAKE','MANAGER',7839,to_date('05-01-1981','MM-DD-YYYY'),2850,null,30);
INSERT INTO emp VALUES (7782,'CLARK','MANAGER',7839,to_date('06-09-1981','MM-DD-YYYY'),2450,null,10);
INSERT INTO emp VALUES (7788,'SCOTT','ANALYST',7566,to_date('04-19-1987','MM-DD-YYYY'),3000,null,20);
INSERT INTO emp VALUES (7839,'KING','PRESIDENT',null,to_date('11-17-1981','MM-DD-YYYY'),5000,null,10);
INSERT INTO emp VALUES (7844,'TURNER','SALESMAN',7698,to_date('09-08-1981','MM-DD-YYYY'),1500,0,30);
INSERT INTO emp VALUES (7876,'ADAMS','CLERK',7788,to_date('05-23-1987','MM-DD-YYYY'),1100,null,20);
INSERT INTO emp VALUES (7900,'JAMES','CLERK',7698,to_date('12-03-1981','MM-DD-YYYY'),950,null,30);
INSERT INTO emp VALUES (7902,'FORD','ANALYST',7566,to_date('12-02-1981','MM-DD-YYYY'),3000,null,20);
INSERT INTO emp VALUES (7934,'MILLER','CLERK',7782,to_date('01-23-1982','MM-DD-YYYY'),1300,null,10);

-- 查询入职人数
SELECT '年份：'|| TO_CHAR(hiredate, 'YYYY') AS 年份, COUNT(*) AS 人数
FROM emp
GROUP BY TO_CHAR(hiredate, 'YYYY')
ORDER BY 年份;

-- 创建分区表格
CREATE TABLE emp_partitioned (
  empno NUMBER(4) PRIMARY KEY,
  ename VARCHAR2(10),
  job VARCHAR2(9),
  mgr NUMBER(4),
  hiredate DATE,
  sal NUMBER(7,2),
  comm NUMBER(7,2),
  deptno NUMBER(2)
)
PARTITION BY RANGE (TO_CHAR(hiredate, 'YYYY'))
(
  PARTITION p0 VALUES LESS THAN (1982),
  PARTITION p1 VALUES LESS THAN (MAXVALUE)
);

-- 插入数据
INSERT INTO emp_partitioned VALUES (7369,'SMITH','CLERK',7902,to_date('12-17-1980','MM-DD-YYYY'),800,null,20);
INSERT INTO emp_partitioned VALUES (7499,'ALLEN','SALESMAN',7698,to_date('02-20-1981','MM-DD-YYYY'),1600,300,30);
INSERT INTO emp_partitioned VALUES (7521,'WARD','SALESMAN',7698,to_date('02-22-1981','MM-DD-YYYY'),1250,500,30);
INSERT INTO emp_partitioned VALUES (7566,'JONES','MANAGER',7839,to_date('04-02-1981','MM-DD-YYYY'),2975,null,20);
INSERT INTO emp_partitioned VALUES (7654,'MARTIN','SALESMAN',7698,to_date('09-28-1981','MM-DD-YYYY'),1250,1400,30);
INSERT INTO emp_partitioned VALUES (7698,'BLAKE','MANAGER',7839,to_date('05-01-1981','MM-DD-YYYY'),2850,null,30);
INSERT INTO emp_partitioned VALUES (7782,'CLARK','MANAGER',7839,to_date('06-09-1981','MM-DD-YYYY'),2450,null,10);
INSERT INTO emp_partitioned VALUES (7788,'SCOTT','ANALYST',7566,to_date('04-19-1987','MM-DD-YYYY'),3000,null,20);
INSERT INTO emp_partitioned VALUES (7839,'KING','PRESIDENT',null,to_date('11-17-1981','MM-DD-YYYY'),5000,null,10);
INSERT INTO emp_partitioned VALUES (7844,'TURNER','SALESMAN',7698,to_date('09-08-1981','MM-DD-YYYY'),1500,0,30);
INSERT INTO emp_partitioned VALUES (7876,'ADAMS','CLERK',7788,to_date('05-23-1987','MM-DD-YYYY'),1100,null,20);
INSERT INTO emp_partitioned VALUES (7900,'JAMES','CLERK',7698,to_date('12-03-1981','MM-DD-YYYY'),950,null,30);
INSERT INTO emp_partitioned VALUES (7902,'FORD','ANALYST',7566,to_date('12-02-1981','MM-DD-YYYY'),3000,null,20);
INSERT INTO emp_partitioned VALUES (7934,'MILLER','CLERK',7782,to_date('01-23-1982','MM-DD-YYYY'),1300,null,10);

-- 查询入职人数
SELECT '年份：'|| hire_year AS 年份, COUNT(*) AS 人数
FROM (
  SELECT TO_CHAR(hiredate, 'YYYY') AS hire_year
  FROM emp_partitioned
)
GROUP BY hire_year
ORDER BY 年份;

以上是在Oracle数据库中执行的查询语句，如果您使用的是其他数据库，可能会有所不同。