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Question
Scott Beeson · Feb 16, 2016

Concatenate columns in results with GROUP BY?

#Code Snippet #Databases #SQL #Caché

Here is my original query:

SELECT EventType, InitiatedAt, COUNT(*) as cnt
FROM HS_IHE_ATNA_Repository.Aggregation
WHERE EventType = 'LOGIN'
AND LocalDateTime > '2016-02-16 11:00:00'
GROUP BY EventType, InitiatedAt

This gives me data like this:

LOGIN%SYSTEM69918
LOGINOTHER39


However, I need to get the data back as two columns with all but the last concatenated and delimited, more like this:

LOGIN;%SYSTEM69918
LOGIN;OTHER39

 

I tried this:

SELECT EventType + ';' + InitiatedAt as k, COUNT(*) as cnt
FROM HS_IHE_ATNA_Repository.Aggregation
WHERE EventType = 'LOGIN'
AND LocalDateTime > '2016-02-16 11:00:00'
GROUP BY EventType, InitiatedAt

But the first column always comes back as zero.

kcnt
069918
039

 

is there a way to do this?

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Discussion (3)1
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Tom Woodfin · Feb 16, 2016

You want to use the concatenate operator: ||

e.g.:

SELECT EventType || ';' || InitiatedAt as k, COUNT(*) as cnt
FROM HS_IHE_ATNA_Repository.Aggregation
WHERE EventType = 'LOGIN'
AND LocalDateTime > '2016-02-16 11:00:00'
GROUP BY EventType, InitiatedAt

+ is the addition operator, which implicitly treats string values as 0.

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Scott Beeson · Feb 16, 2016

Perfect! That's what I get for using too much Javascript I guess :)

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Dmitry Maslennikov · Feb 17, 2016

There are some ways to concat values in a cloumn in Caché: CONCAT and STRING.

CONCAT concatenates two strings to return a concatenated string. You can perform exactly the same operation using the concatenate operator (||).

STRING converts one or more strings to the STRING format, and then concatenates these strings into a single string. No case transformation is performed.

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