Oracle的SQL和PL/SQL語法相對寬鬆，而PostgreSQL則相對嚴格一些。
在PL/SQL中，某些語句後可以不加分號，而PG則要求必須加分號。

**Oracle**
建立儲存過程，loop不管加不加分號，均可建立成功。
```
TEST-orcl@DESKTOP-V430TU3>CREATE OR REPLACE PROCEDURE proc_test(a NUMBER) as
  2  v_id number;
  3  begin
  4    for i in (select 1 from dual) loop
  5      select 2 into v_id from dual;
  6    end loop
  7    return;
  8  end;
  9  /

Procedure created.

TEST-orcl@DESKTOP-V430TU3>
TEST-orcl@DESKTOP-V430TU3>CREATE OR REPLACE PROCEDURE proc_test(a NUMBER) as
  2  v_id number;
  3  begin
  4    for i in (select 1 from dual) loop
  5      select 2 into v_id from dual;
  6    end loop;
  7    return;
  8  end;
  9  /

Procedure created.

TEST-orcl@DESKTOP-V430TU3>

```

**PostgreSQL**
建立儲存過程，loop後必須加分號，才可建立成功。
```
[local:/data/run/pg12]:5120 pg12@testdb=# CREATE OR REPLACE PROCEDURE proc_test(pi_in int) 
pg12@testdb-# as
pg12@testdb-# $$
pg12@testdb$# declare
pg12@testdb$#   v_id int;
pg12@testdb$#   i record;
pg12@testdb$# begin 
pg12@testdb$#   for i in (select 1 from dual) loop 
pg12@testdb$#     select 2 into v_id from dual; 
pg12@testdb$#   end loop
pg12@testdb$#   return; 
pg12@testdb$# end;
pg12@testdb$# $$ LANGUAGE 'plpgsql';
t(pi_in int) 
as
$$
declare
  v_id int;
  i record;
begin 
  for i in (select 1 from dual) loop 
    select 2 into v_id from dual; 
  end loop;
  return; 
end;
$$ LANGUAGE 'plpgsql';

ERROR:  end label "return" specified for unlabelled block
LINE 11:   return; 
           ^
[local:/data/run/pg12]:5120 pg12@testdb=# 
[local:/data/run/pg12]:5120 pg12@testdb=# 
[local:/data/run/pg12]:5120 pg12@testdb=# CREATE OR REPLACE PROCEDURE proc_test(pi_in int) 
pg12@testdb-# as
pg12@testdb-# $$
pg12@testdb$# declare
pg12@testdb$#   v_id int;
pg12@testdb$#   i record;
pg12@testdb$# begin 
pg12@testdb$#   for i in (select 1 from dual) loop 
pg12@testdb$#     select 2 into v_id from dual; 
pg12@testdb$#   end loop;
pg12@testdb$#   return; 
pg12@testdb$# end;
pg12@testdb$# $$ LANGUAGE 'plpgsql';
CREATE PROCEDURE
[local:/data/run/pg12]:5120 pg12@testdb=# 
[local:/data/run/pg12]:5120 pg12@testdb=#

```

**參考資料**
N/A

Oracle vs PostgreSQL Develop（25） - plsql vs plpgsql（語法嚴謹性）

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