Does Listagg need group by?

Listagg is an ordered set function, which require the within group clause to specify an order. The minimal syntax is: LISTAGG(, ) WITHIN GROUP(ORDER BY …)

How do I use Listagg in group by?

As a single-set aggregate function, LISTAGG operates on all rows and returns a single output row. As a group-set aggregate function, LISTAGG operates on and returns an output row for each group that’s defined by GROUP BY clause….About LISTAGG.

Input data type	Output data type
BINARY( n ) or VARBINARY( n )	VARBINARY

How get distinct values from Listagg?

The LISTAGG aggregate function orders the rows for each group in a query according to the ORDER BY expression and then concatenates the values into a single string. With the new DISTINCT keyword, duplicate values can be removed from the specified expression before concatenation into a single string.

What is a Listagg?

The Oracle LISTAGG() function is an aggregation function that transforms data from multiple rows into a single list of values separated by a specified delimiter.

Can we use distinct in Listagg in Oracle?

The LISTAGG aggregate function now supports duplicate elimination by using the new DISTINCT keyword. The LISTAGG aggregate function orders the rows for each group in a query according to the ORDER BY expression and then concatenates the values into a single string.

How does Listagg work in Oracle?

An Oracle LISTAGG Function is an aggregate function that returns a single row. This is used to transform data from multiple rows into a single list of values separated by a given delimiter. It operates on all rows and returns single. It returns a comma or other delimiter separatedresult set just like an excel CSV file.

What does Listagg return?

The LISTAGG function returns a string value.

Can I use distinct with Listagg?

Upcoming Oracle 19c will support DISTINCT with LISTAGG . The LISTAGG aggregate function now supports duplicate elimination by using the new DISTINCT keyword.

What can I use instead of Listagg?

In order to concatenate field values, I would use “GROUP_CONCAT” function in Virtual DataPort Administration tool which is similar to LISTAGG function. For example, GROUP_CONCAT(”,)

Can we use Listagg in Oracle Forms?

The LISTAGG function can be used in the following versions of Oracle/PLSQL: Oracle 12c, Oracle 11g Release 2.