Apache Impala and SQL magic for IPython/Jupyter notebooks

1. Load SQL magic extension (uses ipython-sql by Catherine Devlin)



In [1]:

    
%load_ext sql

2. Connect to the target database (requires Cloudera impyla)



In [2]:

    
%%sql
impala://impalasrv-test:21050/test2









    Out[2]:





u'Connected: None@test2'

3. Run SQL on the target using the %%sql cell magic or %sql line magic



In [3]:

    
%%sql 
select * from emp









    



Done.






    Out[3]:





    
        empno
        ename
        job
        mgr
        hiredate
        sal
        comm
        deptno
    
    
        7521
        WARD
        SALESMAN
        7698
        1981-02-22 00:00:00
        1250
        500
        30
    
    
        7902
        FORD
        ANALYST
        7566
        1981-12-03 00:00:00
        3000
        None
        20
    
    
        7900
        JAMES
        CLERK
        7698
        1981-12-03 00:00:00
        950
        None
        30
    
    
        7782
        CLARK
        MANAGER
        7839
        1981-06-09 00:00:00
        2450
        None
        10
    
    
        7566
        JONES
        MANAGER
        7839
        1981-04-02 00:00:00
        2975
        None
        20
    
    
        7698
        BLAKE
        MANAGER
        7839
        1981-05-01 00:00:00
        2850
        None
        30
    
    
        7839
        KING
        PRESIDENT
        None
        1981-11-17 00:00:00
        5000
        None
        10
    
    
        7788
        SCOTT
        ANALYST
        7566
        1987-04-19 00:00:00
        3000
        None
        20
    
    
        7369
        SMITH
        CLERK
        7902
        1980-12-17 00:00:00
        800
        None
        20
    
    
        7654
        MARTIN
        SALESMAN
        7698
        1981-09-28 00:00:00
        1250
        1400
        30
    
    
        7934
        MILLER
        CLERK
        7782
        1982-01-23 00:00:00
        1300
        None
        10
    
    
        7876
        ADAMS
        CLERK
        7788
        1987-05-23 00:00:00
        1100
        None
        20
    
    
        7844
        TURNER
        SALESMAN
        7698
        1981-09-08 00:00:00
        1500
        0
        30
    
    
        7499
        ALLEN
        SALESMAN
        7698
        1981-02-20 00:00:00
        1600
        300
        30

Bind variables



In [4]:

    
Employee_name="SCOTT"

%sql select * from emp where ename=:Employee_name









    



Done.






    Out[4]:





    
        empno
        ename
        job
        mgr
        hiredate
        sal
        comm
        deptno
    
    
        7788
        SCOTT
        ANALYST
        7566
        1987-04-19 00:00:00
        3000
        None
        20

Additional example of the integration with the IPython environment



In [5]:

    
myResultSet=%sql select ename "Employee Name", sal "Salary" from emp

%matplotlib inline
import matplotlib
matplotlib.style.use('ggplot')

myResultSet.bar()









    



Done.






    Out[5]:





<Container object of 14 artists>

The integration with Pandas opens many additional possibilities for data analysis



In [6]:

    
my_DataFrame=myResultSet.DataFrame()



In [7]:

    
my_DataFrame.head()









    Out[7]:






  
    
      
      employee name
      salary
    
  
  
    
      0
      TURNER
      1500
    
    
      1
      FORD
      3000
    
    
      2
      WARD
      1250
    
    
      3
      JONES
      2975
    
    
      4
      JAMES
      950



In [ ]:

empno	ename	job	mgr	hiredate	sal	comm	deptno
7521	WARD	SALESMAN	7698	1981-02-22 00:00:00	1250	500	30
7902	FORD	ANALYST	7566	1981-12-03 00:00:00	3000	None	20
7900	JAMES	CLERK	7698	1981-12-03 00:00:00	950	None	30
7782	CLARK	MANAGER	7839	1981-06-09 00:00:00	2450	None	10
7566	JONES	MANAGER	7839	1981-04-02 00:00:00	2975	None	20
7698	BLAKE	MANAGER	7839	1981-05-01 00:00:00	2850	None	30
7839	KING	PRESIDENT	None	1981-11-17 00:00:00	5000	None	10
7788	SCOTT	ANALYST	7566	1987-04-19 00:00:00	3000	None	20
7369	SMITH	CLERK	7902	1980-12-17 00:00:00	800	None	20
7654	MARTIN	SALESMAN	7698	1981-09-28 00:00:00	1250	1400	30
7934	MILLER	CLERK	7782	1982-01-23 00:00:00	1300	None	10
7876	ADAMS	CLERK	7788	1987-05-23 00:00:00	1100	None	20
7844	TURNER	SALESMAN	7698	1981-09-08 00:00:00	1500	0	30
7499	ALLEN	SALESMAN	7698	1981-02-20 00:00:00	1600	300	30