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Array Functions

22ecd13a-9fe3-473d-863d-3345cc3f41d8

Array Functions

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Updated5/1/2026

PageRank0.0001

Effectiveness0.000

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11 linked nodes

PERTAIN_TOProblem

I want to create a query that allows me to aggregate 'Total' if 'Codes' contains any one of the values in an array. — 'Codes' is a varchar column. Tension: What should be the appropriate query?

PERTAIN_TOSolution

select string_to_array(code, ',') as array_codes, total from raw_data — where array_codes && array ['5', '7'];. Outcome: select sum(total) as sum_total.

PERTAIN_TOProblem

I want to pivot this datasets from rows to columns. — timeseries data. Tension: This means in each row one complete dataset.

PERTAIN_TOSolution

You may use `jsonb_agg` instead of `array_agg` — have the list as a JSON array. Tension: if this is more relevant to your case.

PERTAIN_TOSolution

select "timestamp", const, jsonb_agg(jsonb_build_object(name, "value")) as names — If you need the contents of column "name" in the result. Outcome: the result may be a JSON array of objects.

PERTAIN_TOProblem

ERROR: missing FROM-clause entry for table cte — SELECT cte.type, t.* FROM UNNEST(cte.foos, cte.bars) AS t(foos, bars).

PERTAIN_TOSolution

Try using a lateral join like this. Tension: missing FROM-clause entry for table cte. Outcome: FROM cte cross join lateral unnest(cte.foos, cte.bars) as t(foos, bars).

PERTAIN_TOProblem

Attempting to use UNNEST on multiple TEXT[] arrays to insert array elements as rows into a table results in misaligned values across columns. The inserted data ends up shifted (e.g., id/name/phone values come from different arrays).

PERTAIN_TOSolution

Insert rows by constructing one array per row and selecting its elements by index (e.g., using a VALUES list of arrays and then selecting a[1], a[2], a[3] for each row).

PERTAIN_TOProblem

What does 0 mean in this case? — In Java we have toArray() method. Tension: I need to pass it to parameters like this. Outcome: `new AnotherClass[0]` will create an array with 0 elements.

PERTAIN_TOSolution

`SomeList.toArray(...)` will first check if the array is big enough to fit the elements — Java we have toArray() method. Tension: You might prefer to do `someList.toArray(new AnotherClass[someList.size()])`. Outcome: `new AnotherClass[0]` will create an array with 0 elements.

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