1/15/2024 0 Comments Postgresql string concatenation![]() ![]() ![]() ![]() The first uses the operator: select 'Join these ' 'strings with a number ' 23 result Join these strings with a number 23 You can see from above that PostgreSQL took care of transforming the number to a string to attach it to the rest. If any operand is null then the concatenation function moves to the next operand, leaving previous and subsequent results as they would had the null operand not been present. PostgreSQL offers two ways to concatenate strings. If any operand is null then the concatenation operator result is NULL.By understanding the reasons behind the use of the operator, data scientists and developers can write. The second is type text since the function concat() returns text. While the concatenation operator (||) and the function (concat) combine strings there is a big difference between them: how they handle nulls. In conclusion, the operator is used as the string concatenation operator in PostgreSQL and Redshift due to its historical roots in the SQL-92 standard, its concise syntax, and its compatibility with other SQL-based systems. 2 Answers Sorted by: 9 Use COALESCE to catch and replace NULL values: SELECT f.name AS foo, 'Bazzes: ' COALESCE (stringagg (b.baz, ', '), '') AS bazzes FROM foo f LEFT JOIN bar b ON b.fooid f.id GROUP BY 1 The null-safe concat () is another convenient option as you found yourself, in particular to concatenate multiple values. ![]()
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