Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Based on Erwins input:</p> <pre><code> declare @TableActivity table ([Type] VARCHAR(8) ,Activity VARCHAR(8) ,RelatedActivity VARCHAR(8) ) insert @TableActivity select 'Start','a','-' union select 'Transfer','a','b' union select 'Start','b','-' union select 'Transfer','b','c' union select 'Start','c','-' union select 'Transfer','c','d' union select 'Transfer','c','e' union select 'Start','d','-' union select 'Stop','d','-' union select 'Start','e','-' union select 'Stop','e','-' union select 'Transfer','d','c' union select 'Transfer','e','c' union select 'Stop','c','-' union select 'Transfer','c','b' union select 'Stop','b','-' union select 'Transfer','b','a' union select 'Stop','a','-' union select 'Start','1','-' union select 'Transfer','1','2' union select 'Start','2','-' union select 'Transfer','2','3' union select 'Start','3','-' union select 'Transfer','3','4' union select 'Start','4','-' union select 'Stop','4','-' union select 'Transfer','4','3' union select 'Stop','3','-' union select 'Transfer','3','2' union select 'Stop','2','-' union select 'Transfer','2','1' union select 'Stop','1','-' declare @activity varchar(8) set @activity = 'a' ;WITH ActivitiesGraph(activity, relatedactivity) AS ( SELECT activity, relatedactivity FROM @TableActivity root WHERE root.activity = @activity AND root.type = 'Transfer' UNION ALL SELECT next.activity, next.relatedactivity FROM @TableActivity next INNER JOIN ActivitiesGraph prior ON next.activity = prior.relatedactivity WHERE next.type = 'Transfer' AND prior.activity != next.relatedactivity AND prior.activity != next.activity ) SELECT activity FROM @TableActivity WHERE activity = @activity UNION SELECT relatedactivity FROM ActivitiesGraph </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POTSQL CTE and a Graph of Sorts
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USjsw
    1. USjsw
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POTSQL CTE and a Graph of Sorts
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COWon't handle a larger cycle. add "UNION SELECT 'Transfer', 'c', 'a'" to your example.
      singulars
      1. PO
      1. USShannon Severance
    2. COFortunately that case won't happen in my application: the activity traversals behave as a stack.
      singulars
      1. PO
      1. USjsw
    3. COAh. That's a much simpler case then dealing with general directed graph that has cycles.
      singulars
      1. PO
      1. USShannon Severance
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload