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Migrating STORED PROCEDURES from SQL Server to PostgreSQL (Practical Guide)

Visual checklist T-SQL → PL/pgSQL: parameters, blocks, variables, exceptions, and transactions.

Migrating procedures is not word substitution: you rewrite block anatomy. Use this checklist when reviewing each object.

Compared anatomy

SQL Server

CREATE PROCEDURE dbo.Example @Id INT AS
BEGIN
  DECLARE @x INT = 0;
  SELECT @x = COUNT(*) FROM t WHERE id = @Id;
  IF @@ROWCOUNT = 0 RAISERROR('empty', 16, 1);
END

PostgreSQL

CREATE OR REPLACE PROCEDURE example(p_id int)
LANGUAGE plpgsql AS $$
DECLARE
  x int := 0;
BEGIN
  SELECT COUNT(*) INTO x FROM t WHERE id = p_id;
  IF NOT FOUND THEN RAISE EXCEPTION 'empty';
END;
$$;

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