sql increment counter in select statement

MyISAM data table After a record with the maximum number is deleted, the number cannot be reused. You can use the "auto_increment = N" option to specify an auto-increment initial value when creating a table. You can use the alter table table_name

Today found in bulk INSERT, the self-increment primary key is not continuous ....InnoDB auto_increment Lock ModesThis section describes AUTO_INCREMENT the behavior of lock modes used to generate auto-increment values, and how each lock mode aff ECTS

Note: Prior to mysql8.0, the InnoDB storage engine table self-increment ID may be reused.This can cause problems in a number of scenarios, including but not limited to: primary and Standby switching, historical data migration, and other scenarios.

Background:Self-growth is a very common data attribute, and in MySQL everyone is willing to let the field of the self-growth attribute be a primary key. In particular InnoDB, because of the characteristics of the InnoDB clustered index, using fields

Hibernate uses MySQL's self-growth id attribute to coexist with self-growth ID and manual assignment IDWe know that in MySQL if the table ID is set to the self-growth attribute, if the ID assignment (value is not used) in the INSERT statement, then

SQL, a Structured Query Language (structured Query Language), is a special purpose programming language, a database query and programming language for accessing data and querying, updating, and managing relational database systems, as well as the

Before creating a database, determine if the database exists if exists (SELECT * from sysdatabases where name= ' databaseName ') drop DB databasenamegocreate DATABASE Databasenameon primary--belongs to the primary filegroup by default, which can be

SQL statement Daquan Delete databaseDrop database DatabaseNameSQL statement Daquan backup---Create backup data deviceuse masterexec sp_addumpdevice ' disk ', ' testback ', ' C:\mssql7backup\MyNwind_1.dat '---start backing up backup DATABASE pubs to

SQL is (structured query Language) Structured Query language abbreviation, the following Zhao yiming essay blog from the Basic knowledge, judgment object and application skills, introduced the application of SQL method.BasisCreate a

Practical SQL statement Daquan bitsCN.com I. Basics 1. description: create a database Create database database-name 2. description: Delete a database. Drop database dbname 3. description: back up SQL server --- Create a device for the backup