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Statistics on multiple fields in a table in Oracle (multiple count)

Source: Internet
Author: User
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Requirement: Count the total number of tickets in the WAIT_ORDER table, the total number of unprocessed tickets, the total number of completed tickets, and the total number of incomplete tickets.


Table Structure: For the convenience of the example, the WAIT_ORDER table has only two fields: ID and STATUS. The STATUS indicates the ticket STATUS. 1 indicates not processed, 2 indicates completed, and 3 indicates the total number of incomplete tasks.

SQL:

  1. SELECT
  2. COUNT(B. ID)ASTotal number of tickets,
  3. COUNT(CASE
  4. WHENB. statusIN('1')THEN
  5. 'Un _ deal'
  6. END) Total number of unprocessed tickets,
  8. COUNT(CASE
  9. WHENB. statusIN('2')THEN
  10. 'Had _ complete'
  11. END) Total number of completed tickets,
  13. COUNT(CASE
  14. WHENB. status ='3' THEN
  15. 'Un _ complete'
  16. END) Total number of unfinished tickets
  18.  FROMWAIT_ORDER B

Result:

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