diff --git a/FreeSql.Tests/FreeSql.Tests/ClickHouse/ClickHouseTest1.cs b/FreeSql.Tests/FreeSql.Tests/ClickHouse/ClickHouseTest1.cs
index 2f616a07..55133c34 100644
--- a/FreeSql.Tests/FreeSql.Tests/ClickHouse/ClickHouseTest1.cs
+++ b/FreeSql.Tests/FreeSql.Tests/ClickHouse/ClickHouseTest1.cs
@@ -173,6 +173,7 @@ namespace FreeSql.Tests.MySql
             var repository=fsql.GetRepository<TestAuditValue>();
             var list = repository.Select.ToList();
             list.ForEach(o=>o.UpdateTime = DateTime.Now);
+            list.ForEach(o => o.Enable = true);
             repository.Update(list);
 
         }
@@ -182,6 +183,7 @@ namespace FreeSql.Tests.MySql
         {
             var fsql = g.clickHouse;
             var state=fsql.GetRepository<TestAuditValue>().UpdateDiy.Set(o=>o.UpdateTime,DateTime.Now).Where(o=>1==1).ExecuteAffrows();
+            //var state1 = fsql.GetRepository<TestAuditValue>().UpdateDiy.Set(o => o.UpdateTime, null).Where(o => 1 == 1).ExecuteAffrows();
 
 
         }
diff --git a/Providers/FreeSql.Provider.ClickHouse/Curd/ClickHouseUpdate.cs b/Providers/FreeSql.Provider.ClickHouse/Curd/ClickHouseUpdate.cs
index eb4ba3a0..a284c98d 100644
--- a/Providers/FreeSql.Provider.ClickHouse/Curd/ClickHouseUpdate.cs
+++ b/Providers/FreeSql.Provider.ClickHouse/Curd/ClickHouseUpdate.cs
@@ -68,7 +68,10 @@ namespace FreeSql.ClickHouse.Curd
             }
             sb.Append(")");
         }
-
+        protected override void ToSqlCaseWhenEnd(StringBuilder sb, ColumnInfo col)
+        {
+            sb.Insert(sb.Length - 4, $" ELSE {_commonUtils.QuoteSqlName(col.Attribute.Name)}");
+        }
 #if net40
 #else
         public override Task<int> ExecuteAffrowsAsync(CancellationToken cancellationToken = default) => base.SplitExecuteAffrowsAsync(_batchRowsLimit > 0 ? _batchRowsLimit : 500, _batchParameterLimit > 0 ? _batchParameterLimit : 3000, cancellationToken);