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SQL 查询问题

WBOY
Release： 2016-06-23 13:36:21
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比如，数据表中有r4字段，内容是 
a0010b
a0020b
a0030b
a0040b

现在要按范围查询，a0020b到a0040b 之间的内容

表单：请填写最小单号_____请填写最大单号_____

查询语句怎么写？
谢谢


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where r4>=a0020b and r4

有没有人会？

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SQL 查询问题
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