龍建路橋股份有限公司章程 90

1、第3講 Transact-SQL語言編程編程根底知識問題如何編制類似C語言的根本程序？ 要能編程須具備哪些結(jié)構(gòu)？ 引用數(shù)據(jù)庫對象的規(guī)那么Transact-SQL的語法元素SQL Server中標(biāo)識符的命名規(guī)那么練習(xí)1問題：下面的標(biāo)識符是否符合SQL Server的命名規(guī)那么：$tabletable#_var_1order detailsorder常量和變量常量：字符串常量數(shù)值常量日期常量uniqueidentifier常量注：引用數(shù)值常量不用單引號，引用日期、字符串常量時需要加單引號變量變量：在程序運行過程中其值是變化的量局部變量以開頭；使用DECLARE語句聲明【問題】DECLARE var

2、1 int,var2 moneySELECT var1=50,var2=$29.95SELECT var1,var2 全局變量也稱配置函數(shù)，是系統(tǒng)定義的變量，以開頭；用戶只能使用例如：version rowcount練習(xí)2問題： 編寫程序計算兩個整數(shù)之和課本P99【例3.32】運算符算術(shù)運算符+、*、/、%比較運算符=、=、=、!=、!邏輯運算符NOT、OR、AND、IN、LIKE、BETWEEN、EXISTS字符串連接運算符賦值運算符=位運算符&、|、常用函數(shù)自學(xué)思考：如何將一個數(shù)字轉(zhuǎn)換為一個字符串？如何截取字符串？如何根據(jù)一個人的出生年月，使用日期函數(shù)計算年齡？如何對一個數(shù)進行取整？進行四

3、舍五入？批處理批處理的特點一次發(fā)給數(shù)據(jù)庫效勞器的所有的SQL語句，由GO作為結(jié)束標(biāo)志。編譯成一個可執(zhí)行單元執(zhí)行方案執(zhí)行時，每次執(zhí)行方案中的一條語句特別注意：如果在一個批處理中，某條語句存在語法錯誤，SQL Server將不執(zhí)行批處理中的任何語句?！纠?流控語句【問題】如何用SQL語句編程實現(xiàn)：求1+2+3+4+100=?編程思想：代碼：分析：WHILE、BEGINEND、IFELSE、GOTO的使用用法其他流控語句的使用用法BRAEK：在循環(huán)語句中，用于退出本層循環(huán)CONTINUE：在循環(huán)語句中，結(jié)束本次循環(huán)，重新轉(zhuǎn)到下一次循環(huán)條件的判斷練習(xí)3編寫程序，計算n!n=10，并將結(jié)果顯示出來流控

4、語句CASE語句開關(guān)語句【例】P108 例3.37【練習(xí)4】在Xk數(shù)據(jù)庫中顯示班級編碼、班級名稱和系部名稱當(dāng)系部編碼為01時，顯示系部名稱為“計算機系；當(dāng)系部編碼為02時，顯示系部名稱為“建筑系；當(dāng)系部編碼為03時，顯示系部名稱為“旅游系，要求使用CASE語句流控語句WAITFOR語句：WAITFOR DELAY time延遲一段時間WAITFOR TIME time等待到一個時刻本章總結(jié)重點掌握：SQL Server中標(biāo)識符的命名規(guī)那么學(xué)會使用局部變量和全局變量學(xué)會使用一些常用的函數(shù)流控語句學(xué)會編寫簡單的SQL程序#pXmUiRfOcK9H5E2B+x(u%rZoWkThQeMbJ8G4D1

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