使用通配符计数 case 表达式

Question

Suppose I have this query:

SELECT
(CASE
  WHEN troublequeue LIKE '%DL%' THEN 'Distribution Line Crew'
  WHEN troublequeue LIKE '%MS%' THEN 'Service Crew' 
  WHEN troublequeue LIKE '%TM%' THEN 'Troubleman'
  WHEN troublequeue LIKE '%TT%' THEN 'Tree Crew'
  WHEN troublequeue LIKE '%POLE%' THEN 'Pole Job'
  WHEN troublequeue LIKE '%XFMR%' THEN 'Xfmr Job'
  WHEN troublequeue LIKE '%TOC%' THEN 'Tennesee One Call'
  ELSE 'Other' END) as HeldJobType, 
COUNT(eventid)
FROM
  electric_jobs
WHERE
  BeginDateTime BETWEEN TO_DATE('<{[begin_date]}>', 'MM/DD/YYYY') AND TO_DATE('<{[end_date]}>', 'MM/DD/YYYY')
  AND troublequeue IS NOT NULL
GROUP BY
(CASE
  WHEN troublequeue LIKE '%DL%' THEN 'Distribution Line Crew'
  WHEN troublequeue LIKE '%MS%' THEN 'Service Crew' 
  WHEN troublequeue LIKE '%TM%' THEN 'Troubleman'
  WHEN troublequeue LIKE '%TT%' THEN 'Tree Crew'
  WHEN troublequeue LIKE '%POLE%' THEN 'Pole Job'
  WHEN troublequeue LIKE '%XFMR%' THEN 'Xfmr Job'
  WHEN troublequeue LIKE '%TOC%' THEN 'Tennesee One Call'
  ELSE 'Other' END)
ORDER BY
(CASE
  WHEN troublequeue LIKE '%DL%' THEN 'Distribution Line Crew'
  WHEN troublequeue LIKE '%MS%' THEN 'Service Crew' 
  WHEN troublequeue LIKE '%TM%' THEN 'Troubleman'
  WHEN troublequeue LIKE '%TT%' THEN 'Tree Crew'
  WHEN troublequeue LIKE '%POLE%' THEN 'Pole Job'
  WHEN troublequeue LIKE '%XFMR%' THEN 'Xfmr Job'
  WHEN troublequeue LIKE '%TOC%' THEN 'Tennesee One Call'
  ELSE 'Other' END)

but when I run the query, all of the fields that have multiple inputs get returned as DL. How can I get SQL to give me a count of each time one of these occur, even if there are multiple inputs in one field? The issues come when there is a field with a comma and multiple inputs.

Sample data example is

Troublequeue <- column name
1 TM
2 DL
3 DL
4 DL
5 AMI/STPR
6 PM
7 PM,CR
8 DL
9 TM
10 AMI/STPR
11 TM
12 AMI/STPR
13 AMI/STPR
14 PM
15 AMI/STPR
16 PM
17 MS
18 TOCY, TCN, TT, DL, POLE

Answer 1

If I understand correctly, you want count(distinct) :

count(distinct troublequeue)

This will return the number of distinct values for each row.

You might also want:

min(troublequeue), max(troublequeue)

to get examples of values.

Note that many databases would allow you to use:

group by HeldJobType

All databases should allow:

order by HeldJobType;

Answer 2

You can use:

WITH trouble_ids ( id, HeldJobType ) AS (
  SELECT 'DL', 'Distribution Line Crew' FROM DUAL UNION ALL
  SELECT 'MS', 'Service Crew' FROM DUAL UNION ALL
  SELECT 'TM', 'Troubleman' FROM DUAL UNION ALL
  SELECT 'TT', 'Tree Crew' FROM DUAL UNION ALL
  SELECT 'POLE', 'Pole Job' FROM DUAL UNION ALL
  SELECT 'XFMR', 'Xfmr Job' FROM DUAL UNION ALL
  SELECT 'TOC', 'Tennesee One Call' FROM DUAL
),
job_ids ( event_id, troublequeue, job_id, lvl, max_lvl ) AS (
  SELECT event_id,
         troublequeue,
         REGEXP_SUBSTR( troublequeue, '[A-Z]+', 1, 1, 'i' ),
         1,
         REGEXP_COUNT( troublequeue, '[A-Z]+', 1, 'i' )
  FROM   electric_jobs
  WHERE  BeginDateTime BETWEEN DATE '2021-01-01' AND DATE '2021-02-01'
UNION ALL
  SELECT event_id,
         troublequeue,
         REGEXP_SUBSTR( troublequeue, '[A-Z]+', 1, lvl + 1, 'i' ),
         lvl + 1,
         max_lvl
  FROM   job_ids
  WHERE  lvl < max_lvl
)
SELECT COALESCE( t.HeldJobType, 'Other' ) AS HeldJobType,
       COUNT( e.event_id )
FROM   job_ids e
       LEFT OUTER JOIN trouble_ids t
       ON ( e.job_id = t.id )
GROUP BY
       COALESCE( t.HeldJobType, 'Other' );

Which, for your sample data:

CREATE TABLE electric_jobs ( event_id, troublequeue ) AS
SELECT  1, 'TM' FROM DUAL UNION ALL
SELECT  2, 'DL' FROM DUAL UNION ALL
SELECT  3, 'DL' FROM DUAL UNION ALL
SELECT  4, 'DL' FROM DUAL UNION ALL
SELECT  5, 'AMI/STPR' FROM DUAL UNION ALL
SELECT  6, 'PM' FROM DUAL UNION ALL
SELECT  7, 'PM,CR' FROM DUAL UNION ALL
SELECT  8, 'DL' FROM DUAL UNION ALL
SELECT  9, 'TM' FROM DUAL UNION ALL
SELECT 10, 'AMI/STPR' FROM DUAL UNION ALL
SELECT 11, 'TM' FROM DUAL UNION ALL
SELECT 12, 'AMI/STPR' FROM DUAL UNION ALL
SELECT 13, 'AMI/STPR' FROM DUAL UNION ALL
SELECT 14, 'PM' FROM DUAL UNION ALL
SELECT 15, 'AMI/STPR' FROM DUAL UNION ALL
SELECT 16, 'PM' FROM DUAL UNION ALL
SELECT 17, 'MS' FROM DUAL UNION ALL
SELECT 18, 'TOCY, TCN, TT, DL, POLE' FROM DUAL;

Outputs:

 HELDJOBTYPE | COUNT(E.EVENT_ID):--------------------- | ----------------: Distribution Line Crew |  5 Pole Job |  1 Other |  17 Tree Crew |  1 Service Crew |  1 Troubleman |  3 

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