云数据库 GAUSSDB-MOVE:示例

时间：2024-11-02 18:50:36

云数据库 GAUSSDB

示例

--创建SCHEMA。
gaussdb=# CREATE SCHEMA tpcds;

--创建表tpcds.reason。
gaussdb=# CREATE TABLE tpcds.reason
(
r_reason_sk         INTEGER      NOT NULL,
r_reason_id         CHAR(16)     NOT NULL,
r_reason_desc       VARCHAR(40)
);

--向表中插入多条记录。
gaussdb=# INSERT INTO tpcds.reason VALUES (1, 'AAAAAAAABAAAAAAA', 'Xxxxxxxxx'),(2, 'AAAAAAAACAAAAAAA', ' Xxxxxxxxx'),(3, 'AAAAAAAADAAAAAAA', ' Xxxxxxxxx'),(4, 'AAAAAAAAEAAAAAAA', 'Not the product that was ordered'),(5, 'AAAAAAAAFAAAAAAA', 'Parts missing'),(6, 'AAAAAAAAGAAAAAAA', 'Does not work with a product that I have'),(7, 'AAAAAAAAHAAAAAAA', 'Gift exchange');

--开始一个事务。
gaussdb=# START TRANSACTION;

--定义一个名为cursor1的游标。
gaussdb=# CURSOR cursor1 FOR SELECT * FROM tpcds.reason;

--忽略游标cursor1的前3行。
gaussdb=# MOVE FORWARD 3 FROM cursor1;

--抓取游标cursor1的前4行。
gaussdb=# FETCH 4 FROM cursor1;
 r_reason_sk |   r_reason_id    |                                            r_reason_desc                                             
-------------+------------------+------------------------------------------------------------------------------------------------------
           4 | AAAAAAAAEAAAAAAA | Not the product that was ordered                                                                     
           5 | AAAAAAAAFAAAAAAA | Parts missing                                                                                       
           6 | AAAAAAAAGAAAAAAA | Does not work with a product that I have                                                            
           7 | AAAAAAAAHAAAAAAA | Gift exchange                                                                                       
(4 rows)

--关闭游标。
gaussdb=# CLOSE cursor1;

--结束一个事务。
gaussdb=# END;

--删除表。
gaussdb=# DROP TABLE tpcds.reason;

--删除SCHEMA。
gaussdb=# DROP SCHEMA tpcds CASCADE;