pig和mysql脚本对比

测试数据位于：/home/hadoop/luogankun/workspace/sync_data/pig

dept和emp表来源自oracle数据库自带的表

dept.txt

10      ACCOUNTING      NEW YORK

20      RESEARCH        DALLAS

30      SALES   CHICAGO

40      OPERATIONS      BOSTON

emp.txt

7369    SMITH   CLERK   7902    1980-12-17      800.00          20

7499    ALLEN   SALESMAN        7698    1981-2-20       1600.00 300.00  30

7521    WARD    SALESMAN        7698    1981-2-22       1250.00 500.00  30

7566    JONES   MANAGER 7839    1981-4-2        2975.00         20

7654    MARTIN  SALESMAN        7698    1981-9-28       1250.00 1400.00 30

7698    BLAKE   MANAGER 7839    1981-5-1        2850.00         30

7782    CLARK   MANAGER 7839    1981-6-9        2450.00         10

7788    SCOTT   ANALYST 7566    1987-4-19       3000.00         20

7839    KING    PRESIDENT               1981-11-17      5000.00         10

7844    TURNER  SALESMAN        7698    1981-9-8        1500.00 0.00    30

7876    ADAMS   CLERK   7788    1987-5-23       1100.00         20

7900    JAMES   CLERK   7698    1981-12-3       950.00          30

7902    FORD    ANALYST 7566    1981-12-3       3000.00         20

7934    MILLER  CLERK   7782    1982-1-23       1300.00         10

 

上传数据到HDFS系统中

cd /home/hadoop/luogankun/workspace/sync_data/pig

hadoop fs -put dept.txt input/pig/dept.txt

hadoop fs -put emp.txt input/pig/emp.txt

 

 

导入

CREATE TABLE TMP_TABLE(USER VARCHAR(32),AGE INT,IS_MALE BOOLEAN);



dept= LOAD 'input/pig/dept.txt' USING PigStorage('\t') AS (deptno:int,dname:chararray,loc:chararray);

emp = LOAD 'input/pig/emp.txt' USING PigStorage('\t') AS (empno:int,ename:chararray, job:chararray, mgr:int, hiredate:chararray,sal:double,comm:double,dept:int);

 

 

查看表结构

desc TMP_TABLE;


describe dept

dept: {deptno: int,dname: chararray,loc: chararray}



describe emp

emp: {empno: int,ename: chararray,job: chararray,mgr: int,hiredate: chararray,sal: double,comm: double,dept: int}

 

 

查询整张表

SELECT * FROM TMP_TABLE;


DUMP dept

(10,ACCOUNTING,NEW YORK)

(20,RESEARCH,DALLAS)

(30,SALES,CHICAGO)

(40,OPERATIONS,BOSTON)



DUMP emp

(7369,SMITH,CLERK,7902,1980-12-17,800.0,,20)

(7499,ALLEN,SALESMAN,7698,1981-2-20,1600.0,300.0,30)

(7521,WARD,SALESMAN,7698,1981-2-22,1250.0,500.0,30)

(7566,JONES,MANAGER,7839,1981-4-2,2975.0,,20)

(7654,MARTIN,SALESMAN,7698,1981-9-28,1250.0,1400.0,30)

(7698,BLAKE,MANAGER,7839,1981-5-1,2850.0,,30)

(7782,CLARK,MANAGER,7839,1981-6-9,2450.0,,10)

(7788,SCOTT,ANALYST,7566,1987-4-19,3000.0,,20)

(7839,KING,PRESIDENT,,1981-11-17,5000.0,,10)

(7844,TURNER,SALESMAN,7698,1981-9-8,1500.0,0.0,30)

(7876,ADAMS,CLERK,7788,1987-5-23,1100.0,,20)

(7900,JAMES,CLERK,7698,1981-12-3,950.0,,30)

(7902,FORD,ANALYST,7566,1981-12-3,3000.0,,20)

(7934,MILLER,CLERK,7782,1982-1-23,1300.0,,10)

 

 

查询前N条

SELECT * FROM TMP_TABLE LIMIT 10;


emp_table_limit = LIMIT emp 10;

DUMP emp_table_limit; 

(7369,SMITH,CLERK,7902,1980-12-17,800.0,,20)

(7499,ALLEN,SALESMAN,7698,1981-2-20,1600.0,300.0,30)

(7521,WARD,SALESMAN,7698,1981-2-22,1250.0,500.0,30)

(7566,JONES,MANAGER,7839,1981-4-2,2975.0,,20)

(7654,MARTIN,SALESMAN,7698,1981-9-28,1250.0,1400.0,30)

(7698,BLAKE,MANAGER,7839,1981-5-1,2850.0,,30)

(7782,CLARK,MANAGER,7839,1981-6-9,2450.0,,10)

(7788,SCOTT,ANALYST,7566,1987-4-19,3000.0,,20)

(7839,KING,PRESIDENT,,1981-11-17,5000.0,,10)

(7844,TURNER,SALESMAN,7698,1981-9-8,1500.0,0.0,30)

 

查询表中的某些列

SELECT USER FROM TMP_TABLE;


emp_table_empno_ename = FOREACH emp GENERATE empno, ename;



describe emp_table_empno_ename

emp_table_empno_ename: {empno: int,ename: chararray}



DUMP emp_table_empno_ename;

(7369,SMITH)

(7499,ALLEN)

(7521,WARD)

(7566,JONES)

(7654,MARTIN)

(7698,BLAKE)

(7782,CLARK)

(7788,SCOTT)

(7839,KING)

(7844,TURNER)

(7876,ADAMS)

(7900,JAMES)

(7902,FORD)

(7934,MILLER)

 

给列取别名

SELECT USER AS USER_NAME,AGE AS USER_AGE FROM TMP_TABLE;


emp_table_column_alias = FOREACH emp GENERATE empno AS id,ename AS name;



describe emp_table_column_alias

emp_table_column_alias: {id: int,name: chararray}



DUMP emp_table_column_alias

(7369,SMITH)

(7499,ALLEN)

(7521,WARD)

(7566,JONES)

(7654,MARTIN)

(7698,BLAKE)

(7782,CLARK)

(7788,SCOTT)

(7839,KING)

(7844,TURNER)

(7876,ADAMS)

(7900,JAMES)

(7902,FORD)

(7934,MILLER)

 

排序

SELECT * FROM TMP_TABLE ORDER BY AGE;


emp_table_order = ORDER emp BY empno ASC;



DUMP emp_table_order;

(7369,SMITH,CLERK,7902,1980-12-17,800.0,,20)

(7499,ALLEN,SALESMAN,7698,1981-2-20,1600.0,300.0,30)

(7521,WARD,SALESMAN,7698,1981-2-22,1250.0,500.0,30)

(7566,JONES,MANAGER,7839,1981-4-2,2975.0,,20)

(7654,MARTIN,SALESMAN,7698,1981-9-28,1250.0,1400.0,30)

(7698,BLAKE,MANAGER,7839,1981-5-1,2850.0,,30)

(7782,CLARK,MANAGER,7839,1981-6-9,2450.0,,10)

(7788,SCOTT,ANALYST,7566,1987-4-19,3000.0,,20)

(7839,KING,PRESIDENT,,1981-11-17,5000.0,,10)

(7844,TURNER,SALESMAN,7698,1981-9-8,1500.0,0.0,30)

(7876,ADAMS,CLERK,7788,1987-5-23,1100.0,,20)

(7900,JAMES,CLERK,7698,1981-12-3,950.0,,30)

(7902,FORD,ANALYST,7566,1981-12-3,3000.0,,20)

(7934,MILLER,CLERK,7782,1982-1-23,1300.0,,10)

 

条件查询

SELECT * FROM TMP_TABLE WHERE AGE>20;


emp_table_where = FILTER emp by sal > 1500;



DUMP emp_table_where;

(7499,ALLEN,SALESMAN,7698,1981-2-20,1600.0,300.0,30)

(7566,JONES,MANAGER,7839,1981-4-2,2975.0,,20)

(7698,BLAKE,MANAGER,7839,1981-5-1,2850.0,,30)

(7782,CLARK,MANAGER,7839,1981-6-9,2450.0,,10)

(7788,SCOTT,ANALYST,7566,1987-4-19,3000.0,,20)

(7839,KING,PRESIDENT,,1981-11-17,5000.0,,10)

(7902,FORD,ANALYST,7566,1981-12-3,3000.0,,20)

 

内连接Inner Join

SELECT * FROM TMP_TABLE A JOIN TMP_TABLE_2 B ON A.AGE=B.AGE;


emp_table_inner_join = JOIN emp BY dept,dept BY deptno;



describe emp_table_inner_join

emp_table_inner_join: 

{emp::empno: int,emp::ename: chararray,emp::job: chararray,emp::mgr: int,

emp::hiredate: chararray,emp::sal: double,emp::comm: double,emp::dept: int,

dept::deptno: int,dept::dname: chararray,dept::loc: chararray}



DUMP emp_table_inner_join;

(7839,KING,PRESIDENT,,1981-11-17,5000.0,,10,10,ACCOUNTING,NEW YORK)

(7782,CLARK,MANAGER,7839,1981-6-9,2450.0,,10,10,ACCOUNTING,NEW YORK)

(7934,MILLER,CLERK,7782,1982-1-23,1300.0,,10,10,ACCOUNTING,NEW YORK)

(7369,SMITH,CLERK,7902,1980-12-17,800.0,,20,20,RESEARCH,DALLAS)

(7566,JONES,MANAGER,7839,1981-4-2,2975.0,,20,20,RESEARCH,DALLAS)

(7876,ADAMS,CLERK,7788,1987-5-23,1100.0,,20,20,RESEARCH,DALLAS)

(7902,FORD,ANALYST,7566,1981-12-3,3000.0,,20,20,RESEARCH,DALLAS)

(7788,SCOTT,ANALYST,7566,1987-4-19,3000.0,,20,20,RESEARCH,DALLAS)

(7499,ALLEN,SALESMAN,7698,1981-2-20,1600.0,300.0,30,30,SALES,CHICAGO)

(7844,TURNER,SALESMAN,7698,1981-9-8,1500.0,0.0,30,30,SALES,CHICAGO)

(7900,JAMES,CLERK,7698,1981-12-3,950.0,,30,30,SALES,CHICAGO)

(7698,BLAKE,MANAGER,7839,1981-5-1,2850.0,,30,30,SALES,CHICAGO)

(7654,MARTIN,SALESMAN,7698,1981-9-28,1250.0,1400.0,30,30,SALES,CHICAGO)

(7521,WARD,SALESMAN,7698,1981-2-22,1250.0,500.0,30,30,SALES,CHICAGO)

 

左连接Left Join

SELECT * FROM TMP_TABLE A LEFT JOIN TMP_TABLE_2 B ON A.AGE=B.AGE;


emp_table_left_join = JOIN emp BY dept LEFT OUTER,dept BY deptno;



describe emp_table_left_join

emp_table_left_join: {emp::empno: int,emp::ename: chararray,emp::job: chararray,emp::mgr: int,

emp::hiredate: chararray,emp::sal: double,emp::comm: double,emp::dept: int,

dept::deptno: int,dept::dname: chararray,dept::loc: chararray}





DUMP emp_table_left_join;



(7839,KING,PRESIDENT,,1981-11-17,5000.0,,10,10,ACCOUNTING,NEW YORK)

(7782,CLARK,MANAGER,7839,1981-6-9,2450.0,,10,10,ACCOUNTING,NEW YORK)

(7934,MILLER,CLERK,7782,1982-1-23,1300.0,,10,10,ACCOUNTING,NEW YORK)

(7369,SMITH,CLERK,7902,1980-12-17,800.0,,20,20,RESEARCH,DALLAS)

(7566,JONES,MANAGER,7839,1981-4-2,2975.0,,20,20,RESEARCH,DALLAS)

(7876,ADAMS,CLERK,7788,1987-5-23,1100.0,,20,20,RESEARCH,DALLAS)

(7902,FORD,ANALYST,7566,1981-12-3,3000.0,,20,20,RESEARCH,DALLAS)

(7788,SCOTT,ANALYST,7566,1987-4-19,3000.0,,20,20,RESEARCH,DALLAS)

(7499,ALLEN,SALESMAN,7698,1981-2-20,1600.0,300.0,30,30,SALES,CHICAGO)

(7844,TURNER,SALESMAN,7698,1981-9-8,1500.0,0.0,30,30,SALES,CHICAGO)

(7900,JAMES,CLERK,7698,1981-12-3,950.0,,30,30,SALES,CHICAGO)

(7698,BLAKE,MANAGER,7839,1981-5-1,2850.0,,30,30,SALES,CHICAGO)

(7654,MARTIN,SALESMAN,7698,1981-9-28,1250.0,1400.0,30,30,SALES,CHICAGO)

(7521,WARD,SALESMAN,7698,1981-2-22,1250.0,500.0,30,30,SALES,CHICAGO)

 

右连接Right Join

SELECT * FROM TMP_TABLE A RIGHT JOIN TMP_TABLE_2 B ON A.AGE=B.AGE;


emp_table_right_join = JOIN emp BY dept RIGHT OUTER,dept BY deptno;



describe emp_table_right_join

emp_table_right_join: {emp::empno: int,emp::ename: chararray,emp::job: chararray,emp::mgr: int,

emp::hiredate: chararray,emp::sal: double,emp::comm: double,emp::dept: int,

dept::deptno: int,dept::dname: chararray,dept::loc: chararray}



DUMP emp_table_right_join;

(7839,KING,PRESIDENT,,1981-11-17,5000.0,,10,10,ACCOUNTING,NEW YORK)

(7782,CLARK,MANAGER,7839,1981-6-9,2450.0,,10,10,ACCOUNTING,NEW YORK)

(7934,MILLER,CLERK,7782,1982-1-23,1300.0,,10,10,ACCOUNTING,NEW YORK)

(7369,SMITH,CLERK,7902,1980-12-17,800.0,,20,20,RESEARCH,DALLAS)

(7566,JONES,MANAGER,7839,1981-4-2,2975.0,,20,20,RESEARCH,DALLAS)

(7876,ADAMS,CLERK,7788,1987-5-23,1100.0,,20,20,RESEARCH,DALLAS)

(7902,FORD,ANALYST,7566,1981-12-3,3000.0,,20,20,RESEARCH,DALLAS)

(7788,SCOTT,ANALYST,7566,1987-4-19,3000.0,,20,20,RESEARCH,DALLAS)

(7499,ALLEN,SALESMAN,7698,1981-2-20,1600.0,300.0,30,30,SALES,CHICAGO)

(7844,TURNER,SALESMAN,7698,1981-9-8,1500.0,0.0,30,30,SALES,CHICAGO)

(7900,JAMES,CLERK,7698,1981-12-3,950.0,,30,30,SALES,CHICAGO)

(7698,BLAKE,MANAGER,7839,1981-5-1,2850.0,,30,30,SALES,CHICAGO)

(7654,MARTIN,SALESMAN,7698,1981-9-28,1250.0,1400.0,30,30,SALES,CHICAGO)

(7521,WARD,SALESMAN,7698,1981-2-22,1250.0,500.0,30,30,SALES,CHICAGO)

(,,,,,,,,40,OPERATIONS,BOSTON)

 

全连接Full Join

SELECT * FROM TMP_TABLE A  JOIN TMP_TABLE_2 B ON A.AGE=B.AGE


emp_table_full_join = JOIN emp BY dept FULL OUTER,dept BY deptno;



describe emp_table_full_join

emp_table_full_join: {emp::empno: int,emp::ename: chararray,emp::job: chararray,emp::mgr: int,

emp::hiredate: chararray,emp::sal: double,emp::comm: double,emp::dept: int,

dept::deptno: int,dept::dname: chararray,dept::loc: chararray}



DUMP emp_table_full_join;

(7839,KING,PRESIDENT,,1981-11-17,5000.0,,10,10,ACCOUNTING,NEW YORK)

(7782,CLARK,MANAGER,7839,1981-6-9,2450.0,,10,10,ACCOUNTING,NEW YORK)

(7934,MILLER,CLERK,7782,1982-1-23,1300.0,,10,10,ACCOUNTING,NEW YORK)

(7369,SMITH,CLERK,7902,1980-12-17,800.0,,20,20,RESEARCH,DALLAS)

(7566,JONES,MANAGER,7839,1981-4-2,2975.0,,20,20,RESEARCH,DALLAS)

(7876,ADAMS,CLERK,7788,1987-5-23,1100.0,,20,20,RESEARCH,DALLAS)

(7902,FORD,ANALYST,7566,1981-12-3,3000.0,,20,20,RESEARCH,DALLAS)

(7788,SCOTT,ANALYST,7566,1987-4-19,3000.0,,20,20,RESEARCH,DALLAS)

(7499,ALLEN,SALESMAN,7698,1981-2-20,1600.0,300.0,30,30,SALES,CHICAGO)

(7844,TURNER,SALESMAN,7698,1981-9-8,1500.0,0.0,30,30,SALES,CHICAGO)

(7900,JAMES,CLERK,7698,1981-12-3,950.0,,30,30,SALES,CHICAGO)

(7698,BLAKE,MANAGER,7839,1981-5-1,2850.0,,30,30,SALES,CHICAGO)

(7654,MARTIN,SALESMAN,7698,1981-9-28,1250.0,1400.0,30,30,SALES,CHICAGO)

(7521,WARD,SALESMAN,7698,1981-2-22,1250.0,500.0,30,30,SALES,CHICAGO)

(,,,,,,,,40,OPERATIONS,BOSTON)

 

同时对多张表交叉查询

SELECT * FROM TMP_TABLE,TMP_TABLE_2;


emp_table_cross = CROSS emp,dept;



describe emp_table_cross

emp_table_cross: {emp::empno: int,emp::ename: chararray,emp::job: chararray,emp::mgr: int,

emp::hiredate: chararray,emp::sal: double,emp::comm: double,emp::dept: int,

dept::deptno: int,dept::dname: chararray,dept::loc: chararray}



DUMP emp_table_cross;

(7369,SMITH,CLERK,7902,1980-12-17,800.0,,20,10,ACCOUNTING,NEW YORK)

(7369,SMITH,CLERK,7902,1980-12-17,800.0,,20,20,RESEARCH,DALLAS)

(7369,SMITH,CLERK,7902,1980-12-17,800.0,,20,30,SALES,CHICAGO)

(7369,SMITH,CLERK,7902,1980-12-17,800.0,,20,40,OPERATIONS,BOSTON)

(7499,ALLEN,SALESMAN,7698,1981-2-20,1600.0,300.0,30,10,ACCOUNTING,NEW YORK)

(7499,ALLEN,SALESMAN,7698,1981-2-20,1600.0,300.0,30,20,RESEARCH,DALLAS)

(7499,ALLEN,SALESMAN,7698,1981-2-20,1600.0,300.0,30,30,SALES,CHICAGO)

(7499,ALLEN,SALESMAN,7698,1981-2-20,1600.0,300.0,30,40,OPERATIONS,BOSTON)

(7521,WARD,SALESMAN,7698,1981-2-22,1250.0,500.0,30,10,ACCOUNTING,NEW YORK)

(7521,WARD,SALESMAN,7698,1981-2-22,1250.0,500.0,30,20,RESEARCH,DALLAS)

(7521,WARD,SALESMAN,7698,1981-2-22,1250.0,500.0,30,30,SALES,CHICAGO)

(7521,WARD,SALESMAN,7698,1981-2-22,1250.0,500.0,30,40,OPERATIONS,BOSTON)

(7566,JONES,MANAGER,7839,1981-4-2,2975.0,,20,10,ACCOUNTING,NEW YORK)

(7566,JONES,MANAGER,7839,1981-4-2,2975.0,,20,20,RESEARCH,DALLAS)

(7566,JONES,MANAGER,7839,1981-4-2,2975.0,,20,30,SALES,CHICAGO)

(7566,JONES,MANAGER,7839,1981-4-2,2975.0,,20,40,OPERATIONS,BOSTON)

(7654,MARTIN,SALESMAN,7698,1981-9-28,1250.0,1400.0,30,10,ACCOUNTING,NEW YORK)

(7654,MARTIN,SALESMAN,7698,1981-9-28,1250.0,1400.0,30,20,RESEARCH,DALLAS)

(7654,MARTIN,SALESMAN,7698,1981-9-28,1250.0,1400.0,30,30,SALES,CHICAGO)

(7654,MARTIN,SALESMAN,7698,1981-9-28,1250.0,1400.0,30,40,OPERATIONS,BOSTON)

(7698,BLAKE,MANAGER,7839,1981-5-1,2850.0,,30,10,ACCOUNTING,NEW YORK)

(7698,BLAKE,MANAGER,7839,1981-5-1,2850.0,,30,20,RESEARCH,DALLAS)

(7698,BLAKE,MANAGER,7839,1981-5-1,2850.0,,30,30,SALES,CHICAGO)

(7698,BLAKE,MANAGER,7839,1981-5-1,2850.0,,30,40,OPERATIONS,BOSTON)

(7782,CLARK,MANAGER,7839,1981-6-9,2450.0,,10,10,ACCOUNTING,NEW YORK)

(7782,CLARK,MANAGER,7839,1981-6-9,2450.0,,10,20,RESEARCH,DALLAS)

(7782,CLARK,MANAGER,7839,1981-6-9,2450.0,,10,30,SALES,CHICAGO)

(7782,CLARK,MANAGER,7839,1981-6-9,2450.0,,10,40,OPERATIONS,BOSTON)

(7788,SCOTT,ANALYST,7566,1987-4-19,3000.0,,20,10,ACCOUNTING,NEW YORK)

(7788,SCOTT,ANALYST,7566,1987-4-19,3000.0,,20,20,RESEARCH,DALLAS)

(7788,SCOTT,ANALYST,7566,1987-4-19,3000.0,,20,30,SALES,CHICAGO)

(7788,SCOTT,ANALYST,7566,1987-4-19,3000.0,,20,40,OPERATIONS,BOSTON)

(7839,KING,PRESIDENT,,1981-11-17,5000.0,,10,10,ACCOUNTING,NEW YORK)

(7839,KING,PRESIDENT,,1981-11-17,5000.0,,10,20,RESEARCH,DALLAS)

(7839,KING,PRESIDENT,,1981-11-17,5000.0,,10,30,SALES,CHICAGO)

(7839,KING,PRESIDENT,,1981-11-17,5000.0,,10,40,OPERATIONS,BOSTON)

(7844,TURNER,SALESMAN,7698,1981-9-8,1500.0,0.0,30,10,ACCOUNTING,NEW YORK)

(7844,TURNER,SALESMAN,7698,1981-9-8,1500.0,0.0,30,20,RESEARCH,DALLAS)

(7844,TURNER,SALESMAN,7698,1981-9-8,1500.0,0.0,30,30,SALES,CHICAGO)

(7844,TURNER,SALESMAN,7698,1981-9-8,1500.0,0.0,30,40,OPERATIONS,BOSTON)

(7876,ADAMS,CLERK,7788,1987-5-23,1100.0,,20,10,ACCOUNTING,NEW YORK)

(7876,ADAMS,CLERK,7788,1987-5-23,1100.0,,20,20,RESEARCH,DALLAS)

(7876,ADAMS,CLERK,7788,1987-5-23,1100.0,,20,30,SALES,CHICAGO)

(7876,ADAMS,CLERK,7788,1987-5-23,1100.0,,20,40,OPERATIONS,BOSTON)

(7900,JAMES,CLERK,7698,1981-12-3,950.0,,30,10,ACCOUNTING,NEW YORK)

(7900,JAMES,CLERK,7698,1981-12-3,950.0,,30,20,RESEARCH,DALLAS)

(7900,JAMES,CLERK,7698,1981-12-3,950.0,,30,30,SALES,CHICAGO)

(7900,JAMES,CLERK,7698,1981-12-3,950.0,,30,40,OPERATIONS,BOSTON)

(7902,FORD,ANALYST,7566,1981-12-3,3000.0,,20,10,ACCOUNTING,NEW YORK)

(7902,FORD,ANALYST,7566,1981-12-3,3000.0,,20,20,RESEARCH,DALLAS)

(7902,FORD,ANALYST,7566,1981-12-3,3000.0,,20,30,SALES,CHICAGO)

(7902,FORD,ANALYST,7566,1981-12-3,3000.0,,20,40,OPERATIONS,BOSTON)

(7934,MILLER,CLERK,7782,1982-1-23,1300.0,,10,10,ACCOUNTING,NEW YORK)

(7934,MILLER,CLERK,7782,1982-1-23,1300.0,,10,20,RESEARCH,DALLAS)

(7934,MILLER,CLERK,7782,1982-1-23,1300.0,,10,30,SALES,CHICAGO)

(7934,MILLER,CLERK,7782,1982-1-23,1300.0,,10,40,OPERATIONS,BOSTON)

 

分组GROUP BY

SELECT * FROM TMP_TABLE GROUP BY IS_MALE;


emp_table_group = GROUP emp BY dept;



describe emp_table_group

emp_table_group: {

    group: int,

    emp: {

        (empno: int,ename: chararray,job: chararray,mgr: int,hiredate: chararray,sal: double, comm: double,dept: int)

    }

}



DUMP emp_table_group;

(10,{

    (7839,KING,PRESIDENT,,1981-11-17,5000.0,,10),

    (7782,CLARK,MANAGER,7839,1981-6-9,2450.0,,10),

    (7934,MILLER,CLERK,7782,1982-1-23,1300.0,,10)})

(20,{

    (7369,SMITH,CLERK,7902,1980-12-17,800.0,,20),

    (7566,JONES,MANAGER,7839,1981-4-2,2975.0,,20),

    (7876,ADAMS,CLERK,7788,1987-5-23,1100.0,,20),

    (7902,FORD,ANALYST,7566,1981-12-3,3000.0,,20),

    (7788,SCOTT,ANALYST,7566,1987-4-19,3000.0,,20)})

(30,{

    (7499,ALLEN,SALESMAN,7698,1981-2-20,1600.0,300.0,30),

    (7844,TURNER,SALESMAN,7698,1981-9-8,1500.0,0.0,30),

    (7900,JAMES,CLERK,7698,1981-12-3,950.0,,30),

    (7698,BLAKE,MANAGER,7839,1981-5-1,2850.0,,30),

    (7654,MARTIN,SALESMAN,7698,1981-9-28,1250.0,1400.0,30),

    (7521,WARD,SALESMAN,7698,1981-2-22,1250.0,500.0,30)})

 

分组并统计

SELECT IS_MALE,COUNT(*) FROM TMP_TABLE GROUP BY IS_MALE;


emp_table_group_count = GROUP emp BY dept;



describe emp_table_group_count

emp_table_group_count: {

       group: int,

       emp: {

            (empno: int,ename: chararray,job: chararray,mgr: int,hiredate: chararray,sal: double,comm: double,dept: int

            )

       }

}

emp_table_group_count = FOREACH emp_table_group_count GENERATE group,COUNT($1);



describe emp_table_group_count



DUMP emp_table_group_count;

(10,3)

(20,5)

(30,6)



emp_table_group_count = FOREACH emp_table_group_count GENERATE emp.dept,COUNT($1);



describe emp_table_group_count

emp_table_group_count: {{(dept: int)},long}



DUMP emp_table_group_count;

({(10),(10),(10)},3)

({(20),(20),(20),(20),(20)},5)

({(30),(30),(30),(30),(30),(30)},6)

 

去重DISTINCT

SELECT DISTINCT IS_MALE FROM TMP_TABLE;


emp_table_distinct = FOREACH emp GENERATE dept;



describe emp_table_distinct

emp_table_distinct: {dept: int}



emp_table_distinct = DISTINCT emp_table_distinct;

describe emp_table_distinct

emp_table_distinct: {dept: int}



DUMP  emp_table_distinct;

(10)

(20)

(30)

 

 

pig判空

select * from emp where comm is not null;


emp_table_where_null = FILTER emp by comm is not null;

DUMP emp_table_where_null;



(7499,ALLEN,SALESMAN,7698,1981-2-20,1600.0,300.0,30)

(7521,WARD,SALESMAN,7698,1981-2-22,1250.0,500.0,30)

(7654,MARTIN,SALESMAN,7698,1981-9-28,1250.0,1400.0,30)

(7844,TURNER,SALESMAN,7698,1981-9-8,1500.0,0.0,30)