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Graph/fd42ca5a-68cf-4121-9e7f-9470c101ff41

Problemunvalidated

Cannot limit a domain value to at most two occurrences in a table

fd42ca5a-68cf-4121-9e7f-9470c101ff41

Cannot limit a domain value to at most two occurrences in a table

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Updated5/1/2026

PageRank0.0000

Effectiveness0.000

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17 linked nodes

DESCRIBESQuestion

CAUSED_BYRootCause

A check constraint is only checked when the row is modified — when the row is modified, not when it is selected. Tension: if you dump your database, you might not be able to restore the dump a while later. Outcome: A check constraint is only checked when the row is modified, not when it is selected.

OCCURS_INLanguage

PERTAIN_TODomain

PERTAIN_TODomain

FIXED_BYSolution

Avoiding duplicates requires a table constraint like: — Concurrency. Tension: you run the risk of getting duplicates. Outcome: UNIQUE (auction_id, max_bid).

FIXED_BYSolution

I want that trigger which is calling the notify to be removed — before insert, update, delete on test. Outcome: create trigger test_ignore_writes.

FIXED_BYSolution

That can be solved using a regular expression like: — select substring(ID, '(^[A-Z]{2}\.[A-Z]{1}(\.UP|\.DOWN)*)') from table1;. Outcome: select substring(ID, '(^[A-Z]{2}\.[A-Z]{1}(\.UP|\.DOWN)*)') from table1;.

FIXED_BYSolution

Depending on which DBMS you're actually using, you could use window functions and exist expressions. — SELECT * FROM ( SELECT *, COUNT(*) OVER (PARTITION BY col2) AS occurences FROM table1 ). Tension: where col2 = t1.col2. Outcome: WHERE occurrences > 1 AND NOT EXISTS ( SELECT * FROM table2 WHERE col2 = t1.col2 ).

FIXED_BYSolution

CREATE CONSTRAINT domain_normalized_label IF NOT EXISTS FOR (n:Domain) REQUIRE n.normalizedLabel IS UNIQUE — Added. Tension: Makes the MERGE atomic — concurrent transactions serialize on the constraint. Outcome: (and same for Algorithm).

INSTANCE_OFClusterConcept

SQL Semantics & Concurrency

Wrong Database Host URL

Whitespace Token Search

Constraint-Driven Integrity

Bounded Counts Sequencing

SQL Row Filtering Semantics

Boundary-Count Constraints Drift

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