rowid in postgresql

PostgreSQL is similar to Oracle's multi-process framework, so it can support high-concurrency application scenarios. This is similar to Oracle databases, so it is easier to switch Oracle DBA to PostgreSQL databases, after all, PostgreSQL databases

MySQL is so widely used that I have to migrate some applications from MySQL to PostgreSQL, many open source software is mysql as a database standard, and MySQL as the basis of the abstract, but the use of the process, found that MySQL has a lot of

PostgreSQL tutorial (1): Detailed description of data tables and detailed description of postgresql I. Table definition: For any relational database, tables are the core and basic object units of data storage. Now let's start from here. 1. Create a

Ctid: Represents the physical business information of a data record, which is the displacement of the data block in which a record is located.   Same as the pseudo-column ROWID in Oracle, except in the form of a different one. For example, there is

PostgreSQL usually finds one of the duplicate data and removes other duplicate values with a unique condition. Oracle deduplication is implemented in many ways. It is commonly used to perform deduplication Based on rowid. How does the PostgreSQL

I. Table definition: For any relational database, tables are the core and basic object units of data storage. Now let's start from here. 1. Create a table: Create TableProducts ( Product_no integer, Name text, Price numeric ); 2. delete a

Definition of a table: For any relational database, tables are the most core and basic object unit of data storage. Now let's start from here.1. Create a table: Copy Code code as follows: CREATE TABLE Products ( Product_no Integer,

Java SQL statement optimization experience and PostgreSQL statement Optimization Java SQL statement optimization experience (1) select the most efficient table name sequence (only valid in the rule-based seo/'target = '_ blank'> Optimizer ):The

Deduplication is generally used to locate one of the duplicate data and remove other duplicate values with a unique condition. OracleThere are many de-duplication methods, which are commonly used based on rowid. How to remove duplicate data from

Each table has a hidden system column, which cannot be the same as the system column name when creating a table column, and the following are some of the system columns that PostgreSQL has.(1) OID (4 bytes)The object identifier (that is, the object