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MySQL Query Help

I have a session ID compiled from the following:

Part 1: Julian date (example: 1-365)

Part 2: 4 digit year (example: 2018)

Part 3: Meridian (example: AM or PM)

Part 4 and 5: Other ID values not related to date

Full example: 3162018-AM-1-28

I have a view that aggregates several values from several tables and is built to show data for the current date only. One of the select values is this session_id mentioned above.

In the view, I only want to show records for the session_id associated with the current date. If I use MAX(session_id) in my query, I will get older session_id if they are the newest. If I don't aggregate this data, I get repeating records. Instead, there should be a single record for each person defined with a schedule record for the given day.

-- If Part 1 and Part 2 of the session_id is <> to the current Julian date + 4 digit year, it should return as NULL.

-- If Part 1 and Part 2 of the session_id = to the current Julian date + 4 digit year, it should return the full session_id from trip_history table.

I am attaching the the source tables ([login to view URL]) and the view definition ([login to view URL]) for import and examination.

Keep in mind that the view data is date/time sensitive. There are CASE statements in the view SQL that will only allow you to see records from trip_history that were created on the current date in the AM or PM (dependent on the system time).

Taidot: Tietokannan hallinto, Tietokantaohjelmointi, MySQL, SQL

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( 77 arvostelua ) huntley, Canada

Projektin tunnus: #18145142

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CFinger

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TakaAlex

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dalsaniyasonu123

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