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Could you break this down for me?

Posted on 2016-10-03
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Last Modified: 2016-10-03
Here's the line of code I want to understand:

coalesce(max(cast(statement.exportdate as date)),'1950-01-01')

One piece at a time, here we go:

Coalesce: returns the first value that isn't NULL.
Max: Here, I'm getting the most recent date in the recordset
Cast: converts whatever data you're looking at to a specific data type. In this instance, it's a timestamp and I'm converting it to a date

What's "1950-01-012?"
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Question by:brucegust
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5 Comments
 

Author Comment

by:brucegust
ID: 41826541
Last part: 1950-01-01. Uncooperative fingers...
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Accepted Solution

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Vitor Montalvão earned 500 total points
ID: 41826548
What's "1950-01-01?"
Means that if returned a NULL value it will be replaced by 1950-01-01.
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Author Closing Comment

by:brucegust
ID: 41826555
Perfect!

Thanks!
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LVL 48

Expert Comment

by:Vitor Montalvão
ID: 41826556
Anyway that test is not necessary since MAX() never returns NULL, so you can replace it with max(cast(statement.exportdate as date)).
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Author Comment

by:brucegust
ID: 41826671
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