Find parents with at least two child rows.

SQLite: Use a correlated count when testing a per-parent threshold.

CREATE TABLE people (id INTEGER PRIMARY KEY, name VARCHAR(30));
CREATE TABLE orders (id INTEGER PRIMARY KEY, person_id INTEGER, amount INTEGER);
INSERT INTO people VALUES (1,'Ada'),(2,'Grace'),(3,'Lin');
INSERT INTO orders VALUES (1,1,10),(2,1,20),(3,2,5);
SELECT p.name FROM people p WHERE (SELECT COUNT(*) FROM orders o WHERE o.person_id=p.id)>=2 ORDER BY p.id;

Expected output EXAMPLE

Ada

Details

Requires SQLite 3.40 or later. Run with sqlite3 demo.db in a scratch directory. Result rows below use | between columns, without headers; client display formatting may differ. Use a correlated count when testing a per-parent threshold. The CREATE and INSERT statements provide all input data. Run the complete example in a fresh scratch database or schema.

✓ Verified

Tested on Ubuntu 24.04.5 LTS · 2026-11-02 18:28:23 UTC · SQLite 3.45.1 · bash 5.2.21-2ubuntu4; coreutils 9.4-3ubuntu6.3

Test inputs, results and environment

The exact published code ran in a dedicated Linux test container with prepared inputs. Snippet process uid 65534 with a read-only root filesystem and temporary working files. Networking disabled. Fixtures and output records are isolated from the application database. Testing covers this example and its stated checks, not every input, operating system, or runtime version. The Linux container shares its host's kernel; this is not a native Windows test.

Architecture / host kernel: x86_64 / 6.18.54.1-microsoft-standard-WSL2
Snippet identity / locale: uid=65534, gid=65534 (unprivileged process) / C.UTF-8
Interpreter invocation: Execute the exact SQL in a fresh database/schema; serialize result rows with | separators
Container image ID: sha256:ec91410a8f6ec3e985830b5e3a0560306d36f8c1c5ccd91a6699abe707123fa3
Code SHA-256: 7cc7ff8393252880d9ab0ae168fd2d8e8c288cec00587514ab701a037a1bc6b9
Dependencies: bash 5.2.21-2ubuntu4; coreutils 9.4-3ubuntu6.3

Test input setup

These are the prepared inputs used by the test harness. See Details above for the prerequisites and how to run this example.

# No input files required.

Observed standard output

Ada

Exit code: 0. Standard error: empty. Validation: Exact stdout comparison. System-dependent values above are one recorded run.