awesome-copilot/skills/reviewing-oracle-to-postgres-migration/references/REFERENCE.md

Reference Index

File	Brief description
empty-strings-handling.md	Oracle treats '' as NULL; PostgreSQL keeps empty strings distinct—patterns to align behavior in code, tests, and migrations.
no-data-found-exceptions.md	Oracle SELECT INTO raises "no data found"; PostgreSQL doesn’t—add explicit NOT FOUND handling to mirror Oracle behavior.
oracle-nvl-decode-functions.md	Oracle NVL/NVL2/DECODE have no direct equivalents—replace with COALESCE, CASE WHEN, and NULL-safe comparisons.
oracle-parentheses-from-clause.md	Oracle allows FROM(TABLE_NAME) syntax; PostgreSQL requires FROM TABLE_NAME—remove unnecessary parentheses around table names.
oracle-rownum-pagination.md	Oracle ROWNUM is assigned before ORDER BY; replace top-N and pagination patterns with LIMIT/OFFSET.
oracle-sysdate-sequences-dual.md	Replace SYSDATE/SYSTIMESTAMP with NOW(), sequence .NEXTVAL with nextval('seq'), and remove FROM DUAL.
oracle-to-postgres-sorting.md	How to preserve Oracle-like ordering in PostgreSQL using COLLATE "C" and DISTINCT wrapper patterns.
oracle-to-postgres-to-char-numeric.md	Oracle allows TO_CHAR(numeric) without format; PostgreSQL requires format string—use CAST(numeric AS TEXT) instead.
oracle-to-postgres-type-coercion.md	PostgreSQL strict type checks vs. Oracle implicit coercion—fix comparison errors by quoting or casting literals.
postgres-union-all-planner.md	UNION ALL branches can produce poor plans when predicate pushdown is limited—review plans and split or reshape queries when needed.
postgres-materialized-view-refresh.md	Materialized views are not auto-refreshed after base-table changes—application or jobs must explicitly refresh them.
postgres-concurrent-transactions.md	PostgreSQL allows only one active command per connection—materialize results or use separate connections to avoid concurrent operation errors.
postgres-refcursor-handling.md	Differences in refcursor handling; PostgreSQL requires fetching by cursor name—C# patterns to unwrap and read results.
oracle-to-postgres-timestamp-timezone.md	CURRENT_TIMESTAMP / NOW() return UTC-normalised timestamptz in PostgreSQL; Npgsql surfaces DateTime.Kind=Unspecified—force UTC at connection open and in application code.