August 2019
Intermediate to advanced
560 pages
13h 41m
English
Content preview from Advanced Elasticsearch 7.0
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Conditional
The following table lists the functions supported with their descriptions:
|
Function name |
Description |
|
COALESCE(expr1, expr2,...) |
Returns the first non-null argument. If all are null values, null is returned. |
|
GREATEST(expr1, expr2,...) |
Returns the largest argument. If all are null, null is returned. |
|
IFNULL(expr1, expr2) |
Returns expr2 if expr1 is null. Otherwise, expr1 is returned. |
|
ISNULL(expr1, expr2) |
Returns expr2 if expr1 is null. Otherwise, expr1 is returned. |
|
LEAST(expr1, expr2, ...) |
Returns the smallest argument. If all are null, null is returned. |
|
NULLIF(expr1, expr2) |
Returns null if expr1=expr2. Otherwise, expr1 is returned. |
|
NVL(expr1, expr2) |
Returns expr2 if expr1 is null. Otherwise, ... |
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.