magrit | ♠ Thematic cartography ♠ | Map library
kandi X-RAY | magrit Summary
kandi X-RAY | magrit Summary
[en] Magrit is an online mapping application developed by UMS RIATE. [fr] Magrit est une application de cartographie thématique développée par l'UMS RIATE.
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QUESTION
Using Postgres 12.x, I've just run into a weird problem. For some reason, I'm not getting COALESCE
to work in a stored SQL function. Meaning, I get NULL
instead of my first non-null value.
I suspect that I've missed something obvioius, but can't see it. Can anyone spot what the problem is? I've built a stand-alone example that reproduces the issue.
Thanks
Test Setup ...ANSWER
Answered 2021-Jan-30 at 23:02The lookup function doesn't return anything from the select statement inside it as the where clause fails. The coalesce is never executed therefore. A null is returned by default.
You can rewrite the select as:
select coalesce((SELECT name_ FROM lookup_table WHERE id = id_in),'');
QUESTION
I am very new in xquery and I have a problem, that I can't get solved.
I want to iterate a xml and save some entries in a map. So that I can merge the same keys with different values (StringValue1, StringValue2). At the end I want to return the complete map and save it to a file. Following you find my code. And I using xbase to execute these xquerys.
CODE
...ANSWER
Answered 2020-Mar-20 at 12:37I think you want
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