龙建路桥股份有限公司章程 90.ppt

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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：z字符串常量z数值常量z日期常量zuniqueidentifier常量z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

2、】|DECLARE var1 int,var2 money|SELECT var1=50,var2=$29.95|SELECT 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

3、，使用日期函数计算年龄？|如何对一个数进行取整？进行四舍五入？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=?z编程思想：z代码：z分析：WHILE、BEGINEND、IFELSE、GOTO的使用用法|其他流控语句的使用用法zBRAEK：在循环语句中，用于退出本层循环zCONTINUE：在循环语句中，结束本次循环，重新转

4、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：1.WAITFOR DELAY time延迟一段时间2.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

5、句|学会编写简单的SQL程序#pXmUiRfOcK9H5E2B+x(u%rZoWkThQeMbJ8G4D1z-w*t!qYnVjSgPdLaI6F3C0y)v&s#pXlUiRfNcK9H5E2A+x(u$rZoWkThPeMbJ7G4D1z-w&t!qYmVjSgOdL9I6F3B0y)v%s#oXlUiQfNcK8H5E2A+x*u$rZnWkThPeMaJ7G4C1z-w&t!pYmVjRgOdL9I6E3B0y(v%s#oXlTiQfNbK8H5D2A-x*u$qZnWkShPdMaJ7F4C1z)w&t!pYmUjRgOcL9I6E3B+y(v%r#oXlTiQeNbK8G5D2A-

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