The syntax for the ORDER BY is as follows: ORDER BY expression1, The ORDER BY clause: specifies the order of the concatenated string results and is optional.Delimiter/separator: This specifies the delimiter/separator used when concatenating strings.Expression: This character string can be any legitimate expression.The syntax for the STRING_AGG() function is as follows: STRING_AGG ( expression, separator|delimiter ) The workings of the STRING_AGG() and ARRAY_AGG() functions are identical however, STRING_AGG() is an aggregate function that returns results in string type, whereas ARRAY_AGG() delivers results in array type. To concatenate the strings, we can employ a variety of separators or delimiter symbols. The PostgreSQL 9.0 version supports STRING_AGG() function. The output string won’t have a separator or a delimiter symbol at the end of it. It is used to concatenate a list of strings and adds a place for a delimiter symbol or a separator between all of the strings. The PostgreSQL STRING_AGG() function is one of the aggregate functions that PostgreSQL supports. In this article, we’ll deep dive into learning about the working & usability of PostgreSQL STRING_AGG(). The PostgreSQL STRING_AGG() aggregate function takes input data and creates strings by concatenating the values. Employing aggregate functions enables us to generate output from a set of values. There are numerous built-in aggregate functions in PostgreSQL which includes sum(), min(), max(),count(), etc.
How does PostgreSQL STRING_AGG() function works?.Use Case#4: Ordering the contents within the output string.Use Case#3: Removing duplicates in our output string.Use Case#2: Using PostgreSQL STRING_AGG() to separate multiple columns with commas.Use Case#1: Using PostgreSQL STRING_AGG() create Comma-Separated Values.
#POSTGRESQL STRING CONCATENATION CODE#
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