create_time timestamp NULL ); 首先、我们来做的是ROW的触发 第一步、建立个针对触发器的存储(方法)过程 CREATEORREPLACEFUNCTIONpublic.func_test_clone()RETURNStriggerLANGUAGEplpgsqlAS$function$beginif(TG_OP='INSERT')THENinsertinto"test_clone"(id,content,create_time)values(new.id,new.content,new.creat...
The PostgreSQLCREATE TABLEstatement is used to create a new table in a database. It defines the structure of the table, including column names, data types, and constraints. This tutorial covers how to use theCREATE TABLEstatement with practical examples. TheCREATE TABLEstatement is one of the ...
The metadata column stores JSON data, which can be queried and manipulated using PostgreSQL's JSON functions. Insert with CURRENT_TIMESTAMPThis example demonstrates how to insert the current timestamp into a table: insert_timestamp.sql -- CREATE TABLE books ( -- book_id INTEGER PRIMARY KEY, ...
为生成更优的执行计划,PolarDB PostgreSQL版(兼容Oracle)提供了执行计划固定(Statement OUTLINE)功能,简称为OUTLINE。该功能支持对某类SQL自动增加指定HINT,在不影响业务应用程序的情况下,精确控制SQL执行计划。 背景信息 在实际运行的数据库环境中,慢SQL问题常常困扰着运维团队和开发人员。慢SQL的成因多种多样,可能源于数...
https://stackoverflow.com/questions/19963954/set-transaction-query-timeout-in-psycopg2 设置方式 1....
PostgreSQL UPSERT using INSERT ON CONFLICT Statement Summary: in this tutorial, you will learn how to use the PostgreSQL upsert feature to insert a new row into a table if the row does not exist, or update an existing row if it already exists. Introduction to the PostgreSQL UPSERT Statement...
Summary: in this tutorial, you will learn how to use the PostgreSQL ALTER ROLE statement to modify the attributes of a role, rename a role, and change a role’s session default for a configuration variable. Using the PostgreSQL ALTER ROLE to modify attributes of roles To change attributes of...
Amazon Redshift 和 PostgreSQL Amazon Redshift 及 PostgreSQL JDBC 和 ODBC 以不同方式实施的功能 不支持的 PostgreSQL 功能 不支持的 PostgreSQL 数据类型 不支持的 PostgreSQL 函数 使用SQL SQL 参考惯例 基本元素 名称和标识符 文本 null 数据类型 数字类型 ...
update_time timestamp not null, userid bigint not null, dynamic_type smallint not null, dynamic_sub_type smallint not null default -1, dynamic_extern_id bigint not null, dynamic_status smallint not null default 0, primary key (userid, id) ...
Methods can also have the property of “idempotence” in that (aside from error or expiration issues) the side-effects of N > 0 identical requests is the same as for a single request. 这里需要关注几个重点: 幂等不仅仅只是一次(或多次)请求对资源没有副作用(比如查询数据库操作,没有增删改,因此...