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Graph/e5c1739e-e432-4c5d-9fb6-995b2992bba7

Problemunvalidated

Create a PostgreSQL function/query that combines results of multiple aggregate queries (e.g., counts from different tables) into a single-row record.

e5c1739e-e432-4c5d-9fb6-995b2992bba7

Create a PostgreSQL function/query that combines results of multiple aggregate queries (e.g., counts from different tables) into a single-row record.

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Updated5/1/2026

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DESCRIBESQuestion

CAUSED_BYRootCause

SQL allows only one SELECT output per rowset; combining multiple independent scalar subqueries requires shaping them into a composite type or row.

PERTAIN_TODomain

PERTAIN_TODomain

Query Optimization

FIXED_BYSolution

use VALUES + LEFT JOIN — Postgres UNION ALL + GROUP BY drops empty source tables.

FIXED_BYSolution

you can use type overrides as suggested in related issue #309 — Composite and record types aren't yet supported by `sqlc`. Outcome: you can aggregate the table record types directly into an `item[]` field.

FIXED_BYSolution

You need dynamic SQL to do this properly. — in PostgreSQL, I am trying to have SQL which orders by multiple columns. Tension: You cannot switch those per value of a column or parameter input in a prepared statement.

FIXED_BYSolution

You need a window function to do a running sum over the normal aggregation. — select count(distinct mt.customer) as count. Outcome: sum(count(distinct mt.customer)) over (order by mt.enrollment_dt rows unbounded preceding) as running_count.

FIXED_BYSolution

Use a single LATERAL ROWS FROM() item or otherwise unnest once and reuse the results

FIXED_BYSolution

Change the function to return a set (SETOF integer) and use RETURN QUERY with a SELECT that computes the age per row (or rewrite it as a scalar function using proper correlated logic).

FIXED_BYSolution

Use a union of two event rows per order (createdat with val=0 and doneat with val=price when status='completed' else 0), then compute sum(val) over (partition by userid order by event time, keep desc) and filter to the created rows to produce the cumulative total at placement.

FIXED_BYSolution

Aggregate the keys to delete into a single text[] per row (e.g., array_agg of b_value grouped by a) and then subtract that array from the jsonb column in one UPDATE using a CTE or derived table.

FIXED_BYSolution

configure `postgresql.conf` to log all queries and ddl by configuring `log_statement` key in the file to `all` — The official postgres docs are helpful here. Outcome: If it needs to be loaded into a table you can parse the logs and write that information back into a table or just rotate and back up the logs for when they need to be audited.

FIXED_BYSolution

Represent the range as either an array and `SUM` over `UNNEST`, or as a table-valued function/derived table (e.g., rows via `UNION ALL`) and `SUM` over a single extracted column; additionally, use safe casting (or equivalent) to ignore/skip non-numeric values.

FIXED_BYSolution

Define a composite type (e.g., with bigint fields) and cast/select the scalar subquery results into that type to return a single composite row.

FIXED_BYSolution

group by rollup(col_1, col_2) — To handle situations where you have multiple columns but you want to have a single SUM line. Tension: show Grand Total only and not Subtotals. Outcome: having grouping(col_1) = grouping(col_2) order by (col_1, col_2);.

FIXED_BYSolution

Use the JPQL/HQL variant that adds an OVER clause with partitioning (and ordering) so Hibernate accepts ARRAY_AGG, returning the projection via a constructor expression.

FIXED_BYSolution

Use album.review_set.all() in a nested loop, or use aggregate database functions instead

OCCURS_INLanguage

OCCURS_INLanguage

OCCURS_INLanguage

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OCCURS_INPackage

INSTANCE_OFClusterConcept

SQL Dialect Misuse

Database Multi-Insert Mismerge

Unbounded UNION Bloat

Anti-Join Membership Filter

Ordered Stream Merge Windows

SQL Semantics Misuse

SQL Query Semantics Drift

SQL Semantics Mismatches

SQL Logic Misalignment

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