Oracle SQL - Count different courses are scheduled for each trainer and the total number of scheduled courses

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Introduction

The following code shows how many different courses are scheduled for each trainer and the total number of scheduled courses.

Demo

SQL>
SQL> select trainer
  2  ,      count(distinct course)--   ww  w  .  j a  va 2  s .co m
  3  ,      count(*)
  4  from   offerings
  5  group  by trainer;

  TRAINER | COUNT(DISTINCTCOURSE) |  COUNT(*)
--------- | --------------------- | ---------
 [N/A]    |              00003.00 |  00003.00
 07004.00 |              00002.00 |  00002.00
 07001.00 |              00002.00 |  00003.00
 07902.00 |              00002.00 |  00002.00
 07008.00 |              00002.00 |  00002.00
 07011.00 |              00001.00 |  00001.00

6 rows selected.

SQL>

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