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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
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      首頁 > 數據庫 > sql語句 >
      • sql語句大全-Select查詢語句

      • 2015-01-24 21:56 來源:未知
      (1)Select 查詢語句

      sql語句大全

      語法:SELECT [ALL|DISTINCT] <目標列表達式> [AS 列名]
      [,<目標列表達式> [AS 列名] ...] FROM <表名> [,<表名>…]
      [WHERE <條件表達式> [AND|OR <條件表達式>...]
      [GROUP BY 列名 [HAVING <條件表達式>>
      [ORDER BY 列名 [ASC | DESC>
      解釋:[ALL|DISTINCT]   ALL:全部; DISTINCT:不包括重復行
      <目標列表達式> 對字段可使用AVG、COUNT、SUM、MIN、MAX、運算符等
      <條件表達式>
      查詢條件 謂詞
      比較 =、>,<,>=,<=,!=,<>,
      確定范圍 BETWEEN AND、NOT BETWEEN AND
      確定集合 IN、NOT IN
      字符匹配 LIKE(“%”匹配任何長度,“_”匹配一個字符)、NOT LIKE
      空值 IS NULL、IS NOT NULL
      子查詢 ANY、ALL、EXISTS
      集合查詢 UNION(并)、INTERSECT(交)、MINUS(差)
      多重條件 AND、OR、NOT
      <GROUP BY 列名> 對查詢結果分組
      [HAVING <條件表達式>] 分組篩選條件
      [ORDER BY 列名 [ASC | DESC> 對查詢結果排序;ASC:升序 DESC:降序
      例1: select student.sno as 學號, student.name as 姓名, course as 課程名, score as 成績 from score,student where student.sid=score.sid and score.sid=:sid
      例2:select student.sno as 學號, student.name as 姓名,AVG(score) as 平均分 from score,student where student.sid=score.sid and student.class=:class and (term=5 or term=6) group by student.sno, student.name having count(*)>0 order by 平均分 DESC
      例3:select * from score where sid like '9634'
      例4:select * from student where class in (select class from student where name='陳小小')


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