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Description. concat creates a new array consisting of the elements in the object on which it is called, followed in order by, for each argument, the elements of that argument (if the argument is an array) or the argument itself (if the argument is not an array).lements of the original arrays are copied into the new array as follows: 1  Object references (and not the actual object): concat copies object references into the new array. 2  Strings and numbers (not String and Number objects): concat copies the values of strings and numbers into the new array.
I've seen a lot of people mistakenly assume that the new CONCAT() function introduced in SQL Server 2012 was the answer to these feature requests. That function is only meant to operate against columns or variables in a single row; it cannot be used to concatenate values across rows.rouped concatenation is a common problem in SQL Server, with no direct and intentional features to support it (like XMLAGG in Oracle, STRING_AGG or ARRAY_TO_STRING(ARRAY_AGG()) in PostgreSQL, and GROUP_CONCAT in MySQL).