INSERT INTO target_table (id, column1, column2) SELECT id, column1, column2 FROM another_table ON CONFLICT (id) DO UPDATE SET column1 = EXCLUDED.column1, column2 = EXCLUDED.column2; 在上述示例中,target_table是目标表,another_table是另一个表。通过SELECT...
二：如果要插入目标表已经存在： insert into 目的表 select * from 表 where 条件 若两表只是有部分...
BEGIN; -- SQL 操作 INSERT INTO table_name (column1, column2) VALUES (value1, value2); UPDATE table_name SET column1 = value1 WHERE condition; COMMIT; -- 或者 ROLLBACK; 以撤销事务 这只是PostgreSQL语法的一个基础入门。PostgreSQL拥有丰富的功能和复杂的特性,比如JSON数据类型支持、全文搜索、地理...
postgres=# CREATE TABLE pg_fdw_remote (id int4 ,info text) ; CREATE TABLE postgres=# INSERT INTO pg_fdw_remote (id , info ) VALUES (1, 'a'),(2, 'b'); INSERT 0 2 2.本地(pg-15)创建上面的四个核心组件 [postgres@zc ~]$ psql -p 5432 -d postgres psql (15.1) Type "help" ...
Postgres-XL 10.1搭建 1、简介 Postgres-XL 一款开源的PG集群软件,XL代表eXtensible Lattice,即可扩展的PG“格子”之意。它是一个完全满足ACID的、开源的、可方便进行水平扩展的、多租户安全的、基于PostgreSQL的数据库解决方案。 与Pgpool
INSERT 0 1 MyTest=> SELECT id,date_col FROM testtable; id | date_col ---+--- 1 | 2001-02-03 2 | 2003-01-02 MyTest=> INSERT INTO testtable(id,time_col) VALUES(3, TIME'10:20:00'); --插入时间。 INSERT 0 1 MyTest=> SELECT id,time_col FROM testtable WHERE time_col I...
Table of Contents Usage PostgresModule MultiConnectionsDatabase ExampleOfUse Usage PostgresModule PostgresModule is the primary entry point for this package and can be used synchronously @Module({ imports: [ PostgresModule.forRoot({ connectionString: 'postgresql://[user]:[password]@[host]/[nameDb...
Parallel in chunks is another type of snapshot approach where data objects are broken into chunks and snapshots are taken in parallel. Most of the tools support snapshot and the process are invoked in tandem. There are two ways to perform a snapshot in chunks: 1) tabl...
BufMappingLock:使用规则如下,BufMappingLock用于保护buffer tag和buffer的映射,可以认为它保护的是buf_table.c中维护的哈希表。为了查找需要的buffer是否在hash中已经存在,需要获取BufMappingLock的共享锁,如果找到了,对buffer增加引用计数,然后才能释放BufMappingLock。要将页面分配给一个buffer,必须独占持有BufMappingLock...
But this only makes the change to the Postgres table, not the local table! We can fix thisby setting CharactersQuery to fire on the InsertCharacter’s success: Finally, to make our app a little easier to use, we can add another success handler that wipes our input field of the previous...