SQL Server四种匹配符的含义
四种匹配符的含义 % 代表零个或者多个任意字符 代表一个任意字符 [] 指定范围内的任意单个字符 [^] 不在指定范围内的任意单个字符 带有匹配符的字符串必须使用引号引起来,例如下面的示例: LIKE 'BR%'返回以BR开始的任意字符串。 LIKE 'Br%'返回以Br开始的
四种匹配符的含义 % 代表零个或者多个任意字符 代表一个任意字符 [] 指定范围内的任意单个字符 [^] 不在指定范围内的任意单个字符 带有匹配符的字符串必须使用引号引起来,例如下面的示例: LIKE 'BR%'返回以“BR”开始的任意字符串。 LIKE 'Br%'返回以“Br”开始的任意字符中。 LIKE '%een'返回以“een”结束的任意字符串。 LIKE '%en%'返回包含“en”的任意字符串。 liKE 'en'返回以“en”结束的三个字符的字符串。 LIKE '[CK]%'返回以“C”或者“K”开始的任意字符串。 LIKE '[S-V]lng'返回长为四个字符的字符串,结尾是“ing”,开始是从S到V LIKE 'M[^c]%'返回以“M”开始且第二个字符不是“c”的任意字符串。 注意: 使用LIKE运算符通常会导致SQL Server不对给定的表使用与之联系的索引。它告诉SQL server比较所指定的字符串并且找到与所提供的匹配符相匹配的任何内容。由于这种原固,,不推荐在大型表上使用这种类型的搜索或者比较,至少应该提醒用户,系统寻找满足搜索标准的数据行时所需的等待时间非常重要。
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