SQL Query to Identify Process State?

Data and Databases
1

Table sample:

EventTime DATETIME
EventLabel NVARCHAR(20)

Formulate a SQL query returning 0 if absent, 1 if in progress, 2 if complete. Trigger an error on duplicate or missing events.

2

hey, i think u could use a cte with a case stmt to check for duplicate or missing events and return the proper state. kinda curious how u might leverage timing joins for error triggers. any thoughts on that?

3

hey, try a pivot method with nested subqueries to map each event and then flag errors if counts are off. i reccomend validating duplicates early on. might need some tweaks if event times dont align perfectly. cheers

4

In constructing the query, I found using a combination of conditional aggregates and a common table expression to be effective. One can enforce integrity by grouping events and applying a CASE expression to yield the appropriate state. Error conditions can be identified by applying criteria in a HAVING clause, which checks for either duplicate or missing events. This method enhances transparency by ensuring that all constraints are verified early during the query execution, resulting in a reliable and maintainable solution.

5

hey, have u tried window funcs to count events and flag duplicates? i found that approach could make handling ordering simpler while triggerin errors on missing events. hwat method do u use for ensuring proper event flow?