how to revert update query in sql

Oracle supported SQL directives can be divided into data manipulation language statements, data definition language statements, transaction control statements, session control statements, and several other types:1. Data Manipulation Language

[ Oracle-based SQL Optimization ]Oracle-based SQL optimization"Bo Master" Gao Ruilin"Blog Address" http://www.cnblogs.com/grl214 A Written Intent description In the early stage of the system development, due to less

Understanding Transactions and LocksTransactions: The essential tool for maintaining logical data consistency and recoverability.Lock: When multiple users access the same database resource, a mechanism for the priority authority management of access,

Understanding Transactions and LocksTransactions: The essential tool for maintaining logical data consistency and recoverability.Lock: When multiple users access the same database resource, a mechanism for the priority authority management of access,

Transferred from: http://www.cnblogs.com/knowledgesea/p/3714417.htmlUnderstanding Transactions and LocksTransactions: The essential tool for maintaining logical data consistency and recoverability.Lock: When multiple users access the same database

Oracle Query optimization(1) Select the most efficient table name order (only valid in the rule-based optimizer): The Oracle parser processes the table name from the FROM clause in a right-to-left order, and the last table written in the FROM clause

I. Overview of SQL statements(1) SQL is a " Structured Query Language (structured Language)".SQL is the standard query language used by most mainstream database systems.(2) The advantages of SQL statement: The language structure is simple, powerful,

Understanding Transactions and LocksTransactions: The essential tool for maintaining logical data consistency and recoverability.Lock: When multiple users access the same database resource, a mechanism for the priority authority management of access,

Very good SQL statement optimization 34 article1) Select the most efficient table name order (valid only in the rule-based optimizer):The ORACLE parser processes the table names in the FROM clause in a right-to-left order, and the FROM clause is

Software programming in Gizhgara: Getting Started with database transactions (for beginners to read) articles about MS SQL Server and Oracle's differences in database transaction processing are a bit controversial, so keep track of my thoughts on