表的列字段与客户端传来的语句进行比较时，会把客户端语句转成列对应编码再进行比较，这是因为列字段拥有更高优先级。
For comparisons of strings with column values, collation_connection does not matter because columns have their own collation, which has a higher collation precedence.
文中从实际诊断中出发首次将IEC - 60599三比值故障诊断表编写成对应的逻辑编码表，然后应用粗糙集理论构造决策表并对决策表进行约简，最后建立改进的新导则IEC - 60599三比值故障诊断决策规则。
Firstly, a logical diagnostic table of IEC-60599 is presented, and a decision table can be constructed by applying the Rough Set Theory based on the IEC-60599 three-ratio fault diagnosis table.
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