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      VB.net 2010 視頻教程 VB.net 2010 視頻教程 VB.net 2010 視頻教程
      SQL Server 2008 視頻教程 c#入門經典教程 Visual Basic從門到精通視頻教程
      • SQL Server 2008教程之SQL 函數

      • 2015-01-16 04:01 來源:未知
      SQL 函數

      (相關sql教程 及sql server 2008 教程

      SQL 擁有很多可用于計數和計算的內建函數。
      函數的語法
      內建 SQL 函數的語法是:
      SELECT function(列) FROM 表
      函數的類型
      在 SQL 中,基本的函數類型和種類有若干種。函數的基本類型是:
      ·  Aggregate 函數
      ·  Scalar 函數
      合計函數(Aggregate functions
      Aggregate 函數的操作面向一系列的值,并返回一個單一的值。
      注釋:如果在 SELECT 語句的項目列表中的眾多其它表達式中使用 SELECT 語句,則這個 SELECT 必須使用 GROUP BY 語句!
      "Persons" table (在大部分的例子中使用過)
      Name Age
      Adams, John 38
      Bush, George 33
      Carter, Thomas 28
      MS Access 中的合計函數
      函數 描述
      AVG(column) 返回某列的平均值
      COUNT(column) 返回某列的行數(不包括 NULL 值)
      COUNT(*) 返回被選行數
      FIRST(column) 返回在指定的域中第一個記錄的值
      LAST(column) 返回在指定的域中最后一個記錄的值
      MAX(column) 返回某列的最高值
      MIN(column) 返回某列的最低值
      STDEV(column)  
      STDEVP(column)  
      SUM(column) 返回某列的總和
      VAR(column)  
      VARP(column)  
      SQL Server 中的合計函數
      函數 描述
      AVG(column) 返回某列的行數
      BINARY_CHECKSUM  
      CHECKSUM  
      CHECKSUM_AGG  
      COUNT(column) 返回某列的行數(不包括NULL值)
      COUNT(*) 返回被選行數
      COUNT(DISTINCT column) 返回相異結果的數目
      FIRST(column) 返回在指定的域中第一個記錄的值(SQLServer2000 不支持)
      LAST(column) 返回在指定的域中最后一個記錄的值(SQLServer2000 不支持)
      MAX(column) 返回某列的最高值
      MIN(column) 返回某列的最低值
      STDEV(column)  
      STDEVP(column)  
      SUM(column) 返回某列的總和
      VAR(column)  
      VARP(column)  
      Scalar 函數
      Scalar 函數的操作面向某個單一的值,并返回基于輸入值的一個單一的值。
      MS Access 中的 Scalar 函數
      函數 描述
      UCASE(c) 將某個域轉換為大寫
      LCASE(c) 將某個域轉換為小寫
      MID(c,start[,end]) 從某個文本域提取字符
      LEN(c) 返回某個文本域的長度
      INSTR(c,char) 返回在某個文本域中指定字符的數值位置
      LEFT(c,number_of_char) 返回某個被請求的文本域的左側部分
      RIGHT(c,number_of_char) 返回某個被請求的文本域的右側部分
      ROUND(c,decimals) 對某個數值域進行指定小數位數的四舍五入
      MOD(x,y) 返回除法操作的余數
      NOW() 返回當前的系統日期
      FORMAT(c,format) 改變某個域的顯示方式
      DATEDIFF(d,date1,date2) 用于執行日期計算
       
       
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