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<td align="center" valign="middle" class="til"><h3> sql字符串函数 </h3>
发布时间：2007-05-23 来源：本站 作者：佚名<br />
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</table><p>字符串函数如下表所示：</p>
<table style="WIDTH: 390px; HEIGHT: 1066px" width="390" border="1">
<tbody>
<tr>
<td>函数</td>
<td>参数</td>
<td>功能</td>
</tr>
<tr>
<td>+</td>
<td>(expression,expression)</td>
<td>连接两个或多个字符串，二进制串，列名</td>
</tr>
<tr>
<td>ASCⅡ</td>
<td>(char_expr)</td>
<td>返回表达式中最左边一个字符的ASCⅡ值</td>
</tr>
<tr>
<td>CHAR</td>
<td>(integer_expr)</td>
<td>返回整数所代表的ASCⅡ值对应的字符</td>
</tr>
<tr>
<td>LOWER</td>
<td>(char_expr)</td>
<td>将大写字符转换为小写字符</td>
</tr>
<tr>
<td>UPPER</td>
<td>(char_expr)</td>
<td>将小写字符转换为大写字符</td>
</tr>
<tr>
<td>LTRIM</td>
<td>(char_expr)</td>
<td>删除字符串开始部分的空格</td>
</tr>
<tr>
<td>RTRIM</td>
<td>(char_expr)</td>
<td>删除字符串尾部的空格</td>
</tr>
<tr>
<td>RIGHT</td>
<td>(char_expr,integer_expr)</td>
<td>返回char_expr字符串中integer_expr个字符以后的部分字符串，integer_expr为负时，返回NULL</td>
</tr>
<tr>
<td>SPACE</td>
<td>(integer_expr)</td>
<td>返回一个由空格组成的字符串，空格等于integer_expr值，integer_expr为负时，返回NULL</td>
</tr>
<tr>
<td>STR</td>
<td>(float_expr[,length[,decimal]])</td>
<td>将一个数值型数据转换为字符串，length为字符串的长度，decimal为小数点的位数</td>
</tr>
<tr>
<td>STUFF</td>
<td>(char_expr1,start,length,char_expr2)</td>
<td>从char_expr1字符的start个字符位置处删除length个字符，然后把char_expr2字符串插入到char_expr1的start处</td>
</tr>
<tr>
<td>SUBSTRING</td>
<td>(expression,start,length)</td>
<td>从expression的第start个字符处返回length个字符</td>
</tr>
<tr>
<td>REVERSE</td>
<td>(char_expr)</td>
<td>返回char_expr的逆序</td>
</tr>
<tr>
<td>CHARINDEX</td>
<td>('pattern',expression)</td>
<td>返回指定pattern字符串在表达式中的起始位置</td>
</tr>
<tr>
<td>DIFFERENCE</td>
<td>(char_expr1,char_expr2)</td>
<td>比较两个字符串，返回它们的相似性，返回值为1~4</td>
</tr>
<tr>
<td>PATINDEX</td>
<td>('%prattern%',expression)</td>
<td>返回expression中首次出现pattern的起始位置</td>
</tr>
<tr>
<td>REPLICATE</td>
<td>(char_expr,integer_expr)</td>
<td>返回一个由char_expr重复integer_expr次组成的字符串</td>
</tr>
<tr>
<td>SOUNDEX</td>
<td>(char_expr)</td>
<td>返回一个四代码，说明字符串读音的相似性</td>
</tr>
</tbody>
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<p>上一篇：<a href='/data/SQLServer/jc/200705/1181.htm'>sql数学函数</a> 下一篇：<a href='/data/SQLServer/jc/200705/1183.htm'>sql的日期函数</a> </p></td>
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