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在添加自定义字段时，根据实际情况选择合适的字段类型对数据的运算和数据集的性能都非常重要。
本节为您提供了一些关于字段类型选择的建议，请参考。
在选择使用 Sql 表达式字段还是计算字段时，请您参考如下建议：
如需跨数据源构建字段，则只能使用计算字段。
数据源支持的函数不能满足需求而 WynSql函数可以时，请使用计算字段（计算字段使用 WynSql 函数库）。
两者都能满足需求时，优先使用 Sql 表达式。因为sql表达式直接作用于数据源，执行效率高，能够提升数据集的总体运算性能。