SQL中通配符、转义符与"["号的使用(downmoon)
Jun 13, 2016 am 10:05 AM
ampquotsqloneandusecharactersearchofescapeWildcard
一、搜索通配符字符的说明
可以搜索通配符字符。有两种方法可指定平常用作通配符的字符:
使用 ESCAPE 关键字定义转义符。在模式中,当转义符置于通配符之前时,该通配符就解释为普通字符。例如,要搜索在任意位置包含字符串 5% 的字符串,请使用:
WHERE ColumnA LIKE '%5/%%' ESCAPE '/'
在上述 LIKE 子句中,前导和结尾百分号 (%) 解释为通配符,而斜杠 (/) 之后的百分号解释为字符 %。
在方括号 ([ ]) 中只包含通配符本身。要搜索破折号 (-) 而不是用它指定搜索范围,请将破折号指定为方括号内的第一个字符:
WHERE ColumnA LIKE '9[-]5'
下表显示了括在方括号内的通配符的用法。
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