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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.
In our recent post on XML in the Cloud, we used DatabaseSpy to connect to a local MySQL database and to the Amazon Relational Database Service in the cloud. We used the Concat( ) function in a SQL SELECT statement to create XML formatted output from non-XML data as shown below. Our SELECT statement was based on an example in the MySQL documentation on XML support. Letâs take a little deeper look at the problem this statement tries to address.