SQL 语句快速参考 AND / OR SELECT column_name(s) FROM table_name WHERE condition AND|OR condition ALTER TABLE (add column) ALTER TABLE table_name ADD column_name datatype ALTER TABLE (drop column) ALTER TABLE table_name DROP COLUMN column_name AS (alias fo
SQLservice 数据库 use master go xp_cmdshell 'mkdir d:\project', NO_OUTPUT --创建文件夹project,xp_cmdshell为系统存储过程 --检验数据库是否存在，如果为真，删除此数据库-- IF EXISTS(SELECT NAME FROM master.dbo.SYSDATABASES WHERE NAME=N'stuDB') DROP DATABASE stuDB GO --创建数据库-- CREATE DATABA
一本全面介绍GWT应用教科书。 Roadmap Chapter 1 introduces GWT and examines where it sits in relation to complementary and competing technologies. It also shows how easy it is to get a first GWT application up and running. Chapter 2 provides a detailed understand
Refactoring is the process of changing a software system in such a way that it does not alter the external behavior of the code yet improves its internal structure. It is a disciplined way to clean up code that minimizes the chances of introducing b
声明：是SQL教程，是SQL教程。 SQL SQL SQL SQL SQL SQL SQL SQL SQL SELECT. DISTINCT WHERE AND OR IN BETWEEN. LIKE. ORDER BY 函数 COUNT Group By HAVING. ALIAS. 连接 外部连接 Subquery UNION UNION ALL. INTERSECT MINUS Concatenate Substring TRIM Create Table. Create View Cr
