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Migrating oracle to postgres stored procedures

Skill github/awesome-copilot/skills/migrating-oracle-to-postgres-stored-procedures

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Install
npx -y skills add github/awesome-copilot --skill migrating-oracle-to-postgres-stored-procedures

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Migrates Oracle PL/SQL stored procedures to PostgreSQL PL/pgSQL. Translates Oracle-specific syntax, preserves method signatures and type-anchored parameters, leverages orafce where appropriate, and applies explicit collation mapping (`COLLATE "C"` only when appropriate, locale collations when required). Use when converting Oracle stored procedures or functions to PostgreSQL equivalents during a database migration.

SKILL.md

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Migrating Stored Procedures from Oracle to PostgreSQL

Translate Oracle PL/SQL stored procedures and functions to PostgreSQL PL/pgSQL equivalents.

Workflow

Progress:
- [ ] Step 1: Read the Oracle source procedure
- [ ] Step 2: Translate to PostgreSQL PL/pgSQL
- [ ] Step 3: Write the migrated procedure to Postgres output directory

Step 1: Read the Oracle source procedure

Read the Oracle stored procedure from .github/oracle-to-postgres-migration/DDL/Oracle/Procedures and Functions/. Consult the Oracle table/view definitions at .github/oracle-to-postgres-migration/DDL/Oracle/Tables and Views/ for type resolution.

Step 2: Translate to PostgreSQL PL/pgSQL

Apply these translation rules:

  • Translate all Oracle-specific syntax to PostgreSQL equivalents.
  • Preserve original functionality and control flow logic.
  • Keep type-anchored input parameters (e.g., PARAM_NAME IN table_name.column_name%TYPE).
  • Use explicit types (NUMERIC, VARCHAR, INTEGER) for output parameters passed to other procedures — do not type-anchor these.
  • Do not alter method signatures.
  • Do not prefix object names with schema names unless already present in the Oracle source.
  • Leave exception handling and rollback logic unchanged.
  • Do not generate COMMENT or GRANT statements.
  • Apply collation intentionally when ordering text:
    • Use COLLATE "C" only when Oracle-compatible binary ordering is required and no other sort order is specified.
    • If Oracle used explicit linguistic sorting (for example NLS_SORT = French), map to an explicit PostgreSQL locale collation instead of "C".
    • Use SELECT collname, collprovider, collcollate, collctype FROM pg_collation ORDER BY collname; to discover collations in the target environment.
  • Treat UNION ALL as a review checkpoint. Validate plan quality per branch and restructure if combined-branch planning causes regressions (for example, unexpected sequential scans on large tables).
  • Leverage the orafce extension when it improves clarity or fidelity.

Consult the PostgreSQL table/view definitions at .github/oracle-to-postgres-migration/DDL/Postgres/Tables and Views/ for target schema details.

Step 3: Write the migrated procedure to Postgres output directory

Place each migrated procedure in its own file under .github/oracle-to-postgres-migration/DDL/Postgres/Procedures and Functions/{PACKAGE_NAME_IF_APPLICABLE}/. One procedure per file.

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