How to group by column and ignore NULLS within rows - tsql

Question

Hi have a table like this:
langaugeCode titleText introText
en WeeklyTitle NULL
en NULL This text
de HereItIs NULL
de NULL ThereThere
Essentailly I want to group by language code but ignore the columns within a row that are NULL.
I would like to transform this table to:
langaugeCode titleText introText
en WeeklyTitle This text
de HereItIs ThereThere

Answer 1

You may try aggregating by languageCode and taking the maximum value of each column:
SELECT
languageCode,
MAX(titleText) AS titleText,
MAX(introText) AS introText
FROM yourTable
GROUP BY
languageCode;
Demo
This works because the MAX() aggregate function by default ignores NULL values. So, assuming you only have a single non NULL value for each language code, it would be retained during the aggregation.

Answer 2

You can add where condition for not null check for the columns you don't want null value.

Answer 3

I'd "merge" it by doing this:
Make a two tables (t1 and t2) and make a natural join on it.
SELECT
t2.languageCode, t1.titleText, t2.introText
FROM (SELECT
yt1.languageCode, yt1.titleText, yt1.introText
FROM yourTable yt1
GROUP BY
languageCode) t1, yourTable t2
WHERE
t1.languageCode = t2.languageCode
GROUP BY
t2.languageCode, t1.titleText, t2.introText;
Try it ;)