Oracle的SQL和PL/SQL语法相对宽松，而PostgreSQL则相对严格一些。
在PL/SQL中，某些语句后可以不加分号，而PG则要求必须加分号。

Oracle
创建存储过程，loop不管加不加分号，均可创建成功。

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
创建存储过程，loop后必须加分号，才可创建成功。

[local:/data/run/pg12]:5120 pg12@testdb=# CREATE OR REPLACE PROCEDURE proc_test(pi_in int) pg12@testdb-# aspg12@testdb-# $$pg12@testdb$# declarepg12@testdb$# v_id int;pg12@testdb$# i record;pg12@testdb$# begin pg12@testdb$# for i in (select 1 from dual) loop pg12@testdb$# select 2 into v_id from dual; pg12@testdb$# end looppg12@testdb$# return; pg12@testdb$# end;pg12@testdb$# $$ 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 blockLINE 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-# aspg12@testdb-# $$pg12@testdb$# declarepg12@testdb$# v_id int;pg12@testdb$# i record;pg12@testdb$# begin pg12@testdb$# for i in (select 1 from dual) loop pg12@testdb$# select 2 into v_id from dual; pg12@testdb$# end loop;pg12@testdb$# return; pg12@testdb$# end;pg12@testdb$# $$ LANGUAGE 'plpgsql';CREATE PROCEDURE[local:/data/run/pg12]:5120 pg12@testdb=# [local:/data/run/pg12]:5120 pg12@testdb=#

参考资料
N/A