SyntaxFix

[sql] Concatenate multiple result rows of one column into one, group by another column

You can use array_agg function for that:

SELECT "Movie",
array_to_string(array_agg(distinct "Actor"),',') AS Actor
FROM Table1
GROUP BY "Movie";

Result:

MOVIE ACTOR
A 1,2,3
B 4

See this SQLFiddle

For more See 9.18. Aggregate Functions

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