diff --git a/Providers/FreeSql.Provider.Custom/Oracle/Curd/CustomOracleSelect.cs b/Providers/FreeSql.Provider.Custom/Oracle/Curd/CustomOracleSelect.cs
index ad62bf0d..7a8086e1 100644
--- a/Providers/FreeSql.Provider.Custom/Oracle/Curd/CustomOracleSelect.cs
+++ b/Providers/FreeSql.Provider.Custom/Oracle/Curd/CustomOracleSelect.cs
@@ -57,8 +57,8 @@ namespace FreeSql.Custom.Oracle
                             if (string.IsNullOrEmpty(tbsfrom[b].NavigateCondition) &&
                                 string.IsNullOrEmpty(tbsfrom[b].On) &&
                                 string.IsNullOrEmpty(tbsfrom[b].Cascade) &&
-                                string.IsNullOrEmpty(tbsfrom[b].CascadeBefore)) sb.Append(" ON 1 = 1");
-                            else sb.Append(" ON ").Append(string.Join(" AND ", new[]
+                                string.IsNullOrEmpty(tbsfrom[b].CascadeBefore)) sbunion.Append(" ON 1 = 1");
+                            else sbunion.Append(" ON ").Append(string.Join(" AND ", new[]
                                 {
                                     tbsfrom[b].CascadeBefore,
                                     tbsfrom[b].NavigateCondition ?? tbsfrom[b].On,
diff --git a/Providers/FreeSql.Provider.Dameng/Curd/DamengSelect.cs b/Providers/FreeSql.Provider.Dameng/Curd/DamengSelect.cs
index 443400bc..89536822 100644
--- a/Providers/FreeSql.Provider.Dameng/Curd/DamengSelect.cs
+++ b/Providers/FreeSql.Provider.Dameng/Curd/DamengSelect.cs
@@ -56,8 +56,8 @@ namespace FreeSql.Dameng.Curd
                             if (string.IsNullOrEmpty(tbsfrom[b].NavigateCondition) &&
                                 string.IsNullOrEmpty(tbsfrom[b].On) &&
                                 string.IsNullOrEmpty(tbsfrom[b].Cascade) &&
-                                string.IsNullOrEmpty(tbsfrom[b].CascadeBefore)) sb.Append(" ON 1 = 1");
-                            else sb.Append(" ON ").Append(string.Join(" AND ", new[]
+                                string.IsNullOrEmpty(tbsfrom[b].CascadeBefore)) sbunion.Append(" ON 1 = 1");
+                            else sbunion.Append(" ON ").Append(string.Join(" AND ", new[]
                                 {
                                     tbsfrom[b].CascadeBefore,
                                     tbsfrom[b].NavigateCondition ?? tbsfrom[b].On,
diff --git a/Providers/FreeSql.Provider.Odbc/Dameng/Curd/OdbcDamengSelect.cs b/Providers/FreeSql.Provider.Odbc/Dameng/Curd/OdbcDamengSelect.cs
index 81d4ab32..1dc9c3a0 100644
--- a/Providers/FreeSql.Provider.Odbc/Dameng/Curd/OdbcDamengSelect.cs
+++ b/Providers/FreeSql.Provider.Odbc/Dameng/Curd/OdbcDamengSelect.cs
@@ -56,8 +56,8 @@ namespace FreeSql.Odbc.Dameng
                             if (string.IsNullOrEmpty(tbsfrom[b].NavigateCondition) &&
                                 string.IsNullOrEmpty(tbsfrom[b].On) &&
                                 string.IsNullOrEmpty(tbsfrom[b].Cascade) &&
-                                string.IsNullOrEmpty(tbsfrom[b].CascadeBefore)) sb.Append(" ON 1 = 1");
-                            else sb.Append(" ON ").Append(string.Join(" AND ", new[]
+                                string.IsNullOrEmpty(tbsfrom[b].CascadeBefore)) sbunion.Append(" ON 1 = 1");
+                            else sbunion.Append(" ON ").Append(string.Join(" AND ", new[]
                                 {
                                     tbsfrom[b].CascadeBefore,
                                     tbsfrom[b].NavigateCondition ?? tbsfrom[b].On,
diff --git a/Providers/FreeSql.Provider.Odbc/Oracle/Curd/OdbcOracleSelect.cs b/Providers/FreeSql.Provider.Odbc/Oracle/Curd/OdbcOracleSelect.cs
index f1c46abd..3a876c73 100644
--- a/Providers/FreeSql.Provider.Odbc/Oracle/Curd/OdbcOracleSelect.cs
+++ b/Providers/FreeSql.Provider.Odbc/Oracle/Curd/OdbcOracleSelect.cs
@@ -56,8 +56,8 @@ namespace FreeSql.Odbc.Oracle
                             if (string.IsNullOrEmpty(tbsfrom[b].NavigateCondition) &&
                                  string.IsNullOrEmpty(tbsfrom[b].On) &&
                                  string.IsNullOrEmpty(tbsfrom[b].Cascade) &&
-                                 string.IsNullOrEmpty(tbsfrom[b].CascadeBefore)) sb.Append(" ON 1 = 1");
-                            else sb.Append(" ON ").Append(string.Join(" AND ", new[]
+                                 string.IsNullOrEmpty(tbsfrom[b].CascadeBefore)) sbunion.Append(" ON 1 = 1");
+                            else sbunion.Append(" ON ").Append(string.Join(" AND ", new[]
                                 {
                                     tbsfrom[b].CascadeBefore,
                                     tbsfrom[b].NavigateCondition ?? tbsfrom[b].On,
diff --git a/Providers/FreeSql.Provider.Oracle/Curd/OracleSelect.cs b/Providers/FreeSql.Provider.Oracle/Curd/OracleSelect.cs
index dc3eea2a..c1de966a 100644
--- a/Providers/FreeSql.Provider.Oracle/Curd/OracleSelect.cs
+++ b/Providers/FreeSql.Provider.Oracle/Curd/OracleSelect.cs
@@ -57,8 +57,8 @@ namespace FreeSql.Oracle.Curd
                             if (string.IsNullOrEmpty(tbsfrom[b].NavigateCondition) &&
                                 string.IsNullOrEmpty(tbsfrom[b].On) &&
                                 string.IsNullOrEmpty(tbsfrom[b].Cascade) &&
-                                string.IsNullOrEmpty(tbsfrom[b].CascadeBefore)) sb.Append(" ON 1 = 1");
-                            else sb.Append(" ON ").Append(string.Join(" AND ", new[]
+                                string.IsNullOrEmpty(tbsfrom[b].CascadeBefore)) sbunion.Append(" ON 1 = 1");
+                            else sbunion.Append(" ON ").Append(string.Join(" AND ", new[]
                                 {
                                     tbsfrom[b].CascadeBefore,
                                     tbsfrom[b].NavigateCondition ?? tbsfrom[b].On,