postgresql create table primary key autoincrement example

Plist (Nsarry\nsdictionary) Preference (Preference Settings \nsuserdefaults Nscoding (Nskeyedarchiver\nskeyedunarchiver) SQLite3 Core Data SQLite3 What is SQLiteSQLite is a lightweight, embedded databaseIt occupies very

Although yii Dao can process any database-related tasks, it is likely that we spend 90% of the time writing some common SQL statements to execute the CRUD operation (create, read, update and delete ). At the same time, it is difficult for us to

Active Record (AR) is a popular Object relational mapping (ORM) technology. Each AR class represents a datasheet (or view) whose field is the property of the Ar class, and an AR instance represents a row in the table. Common CRUD operations are

How data is stored in iOS Plist (Nsarray\nsdictionary) Preference (Preferences \nsuserdefaults) Nscoding (Nskeyedarchiver\nskeyedunarchiver) SQlite3 Core Date Plist, Preference, nscoding storage methodsSee how iOS

If only one way to use the database is correct, you can create database design, database access, and database based PHP business logic code in a number of ways, but the end result is usually a mistake. This article describes the five common problems

MySQL table sharding auto-incremental ID Solution After we perform the table sharding operation on MySQL, we cannot rely on the automatic increment of MySQL to generate a unique ID, because the data has been distributed to multiple tables. Avoid

FAQ Chinese Version How do I create an auto-increment field? What data types does SQLite support? Why can I insert a string into an integer field of the SQLite database? Why does SQLite think the expression '0' = '00' is true? Why

Data | database | questions Expose five common database problems that occur in PHP applications-including database schema design, database access, and business logic code that uses the database-and their solutions.If only one way to use the database

Data | database | questions "Digest" resolves five common database problems that occur in PHP applications-including database schema design, database access, and business logic code that uses the database-and their solutions.Resolves five common

1) how to create an auto-increment field? A simple answer: a field declared as integer primary key will be automatically added. Here is a detailed answer: Starting from SQLite 2.3.4, if you declare a field in a table as integer primaryKey, so no