龙建路桥股份有限公司章程 24

1、第3讲 Transact-SQL语言编程编程根底知识问题如何编制类似C语言的根本程序？ 要能编程须具备哪些结构？ 引用数据库对象的规那么Transact-SQL的语法元素SQL Server中标识符的命名规那么练习1问题：下面的标识符是否符合SQL Server的命名规那么：$tabletable#_var_1order detailsorder常量和变量常量：字符串常量数值常量日期常量uniqueidentifier常量注：引用数值常量不用单引号，引用日期、字符串常量时需要加单引号变量变量：在程序运行过程中其值是变化的量局部变量以开头；使用DECLARE语句声明【问题】DECLARE var

2、1 int,var2 moneySELECT var1=50,var2=$29.95SELECT var1,var2 全局变量也称配置函数，是系统定义的变量，以开头；用户只能使用例如：version rowcount练习2问题： 编写程序计算两个整数之和课本P99【例3.32】运算符算术运算符+、*、/、%比较运算符=、=、=、!=、!逻辑运算符NOT、OR、AND、IN、LIKE、BETWEEN、EXISTS字符串连接运算符赋值运算符=位运算符&、|、常用函数自学思考：如何将一个数字转换为一个字符串？如何截取字符串？如何根据一个人的出生年月，使用日期函数计算年龄？如何对一个数进行取整？进行四

3、舍五入？批处理批处理的特点一次发给数据库效劳器的所有的SQL语句，由GO作为结束标志。编译成一个可执行单元执行方案执行时，每次执行方案中的一条语句特别注意：如果在一个批处理中，某条语句存在语法错误，SQL Server将不执行批处理中的任何语句。【例】 流控语句【问题】如何用SQL语句编程实现：求1+2+3+4+100=?编程思想：代码：分析：WHILE、BEGINEND、IFELSE、GOTO的使用用法其他流控语句的使用用法BRAEK：在循环语句中，用于退出本层循环CONTINUE：在循环语句中，结束本次循环，重新转到下一次循环条件的判断练习3编写程序，计算n!n=10，并将结果显示出来流控

4、语句CASE语句开关语句【例】P108 例3.37【练习4】在Xk数据库中显示班级编码、班级名称和系部名称当系部编码为01时，显示系部名称为“计算机系；当系部编码为02时，显示系部名称为“建筑系；当系部编码为03时，显示系部名称为“旅游系，要求使用CASE语句流控语句WAITFOR语句：WAITFOR DELAY time延迟一段时间WAITFOR TIME time等待到一个时刻本章总结重点掌握：SQL Server中标识符的命名规那么学会使用局部变量和全局变量学会使用一些常用的函数流控语句学会编写简单的SQL程序pXmUiRfOcK9H5E2B+x(u%rZoWkThQeMbJ8G4D1z

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