Returns the value of the array parameter associated with the looping tag row. Each looping list returns an array of return fields, set in searches with mv_return_field or rf. The default is only to return the code of the search result, but by setting those parameters you can return whichever columns you wish.
[PREFIX-pos N] outputs the data from the Nth column as returned (starting with zero). [PREFIX-param] lets you access the data by column name instead of by number.
In a [query ...] ITL tag you can select multiple return fields with something like:
[query prefix=prefix sql="select foo, bar from baz where foo='buz'"] [prefix-code] [prefix-param foo] [prefix-param bar] [/query]
In this case, [prefix-code] and [prefix-param foo] are synonyms, as foo is the first returned parameter and becomes the code for this row. Another synonym is [prefix-pos 0]. [prefix-pos 1] is the same as [prefix-param bar]. The following code will produce exactly the same output as the above:
[query prefix=prefix sql="select foo, bar from baz where foo='buz'"] [prefix-pos 0] [prefix-pos 0] [prefix-pos 1] [/query]
Note that if you use the [PREFIX-pos] tag, you may have to review your column numbers whenever you modify the columns you select. For this reason, queries that make use of the [PREFIX-param] tag may be easier to maintain and will be less prone to future surprises.