diff --git a/表达式函数.md b/表达式函数.md
index 6f460e0..f035a0a 100644
--- a/表达式函数.md
+++ b/表达式函数.md
@@ -125,6 +125,38 @@ fsql.Select<T1, T2>()
 
 > v1.6.0 利用自定义解析功能，增加 SqlExt.Rank().Over().PartitionBy(...)、MySql group_concat 常用函数，欢迎 PR 补充
 
+FreeSql 默认集成了 SqlExt.cs 扩展解析方法：
+
+| lambda                                              | sql                                                | 说明           |
+| --------------------------------------------------- | -------------------------------------------------- | -------------- |
+| SqlExt.IsNull(id, 0)                                | isnull/ifnull/coalesce/nvl                         | 兼容各大数据库 |
+| SqlExt.DistinctCount(id)                            | count(distinct id)                                 |                |
+| SqlExt.AggregateCount()                             | count(1)                                           | 聚合函数       |
+| SqlExt.AggregateCount(id > 0)                       | sum(case when id > 0 then 1 else 0 end)            |                |
+| SqlExt.AggregateSum(id)                             | sum(id)                                            |                |
+| SqlExt.AggregateAvg(id)                             | avg(id)                                            |                |
+| SqlExt.AggregateMax(id)                             | max(id)                                            |                |
+| SqlExt.AggregateMin(id)                             | min(id)                                            |                |
+| SqlExt.GreaterThan                                  | &gt;                                               | 大于           |
+| SqlExt.GreaterThanOrEqual                           | &gt;=                                              | 大于或等于     |
+| SqlExt.LessThan                                     | &lt;                                               | 小于           |
+| SqlExt.LessThanOrEqual                              | &lt;=                                              | 小于           |
+| SqlExt.EqualIsNull                                  | IS NULL                                            | 是否为 NULL    |
+| SqlExt.Case(字典)                                   | case when .. end                                   | 根据字典 case  |
+| SqlExt.GroupConcat                                  | group_concat(distinct .. order by .. separator ..) | MySql          |
+| SqlExt.FindInSet                                    | find_in_set(str, strlist)                          | MySql          |
+| SqlExt.StringAgg                                    | string_agg(.., ..)                                 | PostgreSQL     |
+| SqlExt.Rank().Over().PartitionBy().ToValue()        | rank() over(partition by xx)                       | 开窗函数       |
+| SqlExt.DenseRank().Over().PartitionBy().ToValue()   | dense_rank() over(partition by xx)                 |                |
+| SqlExt.Count(id).Over().PartitionBy().ToValue()     | count(id) over(partition by xx)                    |                |
+| SqlExt.Sum(id).Over().PartitionBy().ToValue()       | sum(id) over(partition by xx)                      |                |
+| SqlExt.Avg(id).Over().PartitionBy().ToValue()       | avg(id) over(partition by xx)                      |                |
+| SqlExt.Max(id).Over().PartitionBy().ToValue()       | max(id) over(partition by xx)                      |                |
+| SqlExt.Min(id).Over().PartitionBy().ToValue()       | min(id) over(partition by xx)                      |                |
+| SqlExt.RowNumber(id).Over().PartitionBy().ToValue() | row_number(id) over(partition by xx)               |                |
+
+> 以上是利用《自定义解析》实现的功能
+
 ## 子表Exists
 
 ```csharp