--创建模式ot。
openGauss=# CREATE SCHEMA ot;

--创建表ot.t1及其同义词t1。
openGauss=# CREATE TABLE ot.t1(id int, name varchar2(10)) DISTRIBUTE BY hash(id);
openGauss=# CREATE OR REPLACE SYNONYM t1 FOR ot.t1;

--使用同义词t1。
openGauss=# SELECT * FROM t1;
openGauss=# INSERT INTO t1 VALUES (1, 'ada'), (2, 'bob');
openGauss=# UPDATE t1 SET t1.name = 'cici' WHERE t1.id = 2;

--创建同义词v1及其关联视图ot.v_t1。
openGauss=# CREATE SYNONYM v1 FOR ot.v_t1;
openGauss=# CREATE VIEW ot.v_t1 AS SELECT * FROM ot.t1;

--使用同义词v1。
openGauss=# SELECT * FROM v1;

--创建重载函数ot.add及其同义词add。
openGauss=# CREATE OR REPLACE FUNCTION ot.add(a integer, b integer) RETURNS integer AS
$$
SELECT $1 + $2
$$
LANGUAGE sql;

openGauss=# CREATE OR REPLACE FUNCTION ot.add(a decimal(5,2), b decimal(5,2)) RETURNS decimal(5,2) AS
$$
SELECT $1 + $2
$$
LANGUAGE sql;

openGauss=# CREATE OR REPLACE SYNONYM add FOR ot.add;

--使用同义词add。
openGauss=# SELECT add(1,2);
openGauss=# SELECT add(1.2,2.3);

--创建存储过程ot.register及其同义词register。
openGauss=# CREATE PROCEDURE ot.register(n_id integer, n_name varchar2(10))
SECURITY INVOKER
AS
BEGIN
    INSERT INTO ot.t1 VALUES(n_id, n_name);
END;
/

openGauss=# CREATE OR REPLACE SYNONYM register FOR ot.register;

--使用同义词register，调用存储过程。
openGauss=# CALL register(3,'mia');

--删除同义词。
openGauss=# DROP SYNONYM t1;
openGauss=# DROP SYNONYM IF EXISTS v1;
openGauss=# DROP SYNONYM IF EXISTS add;
openGauss=# DROP SYNONYM register;
openGauss=# DROP SCHEMA ot CASCADE;