diff --git a/Src/Asp.NetCore2/SqlSugar.OceanBaseForOracle/OceanBase/SqlBuilder/OceanBaseForOracleExpressionContext.cs b/Src/Asp.NetCore2/SqlSugar.OceanBaseForOracle/OceanBase/SqlBuilder/OceanBaseForOracleExpressionContext.cs
index 31c8bc592a0c118d69155e4011db5f988de07022..b5c97829f5b3395143d4661380c23991faf837ab 100644
--- a/Src/Asp.NetCore2/SqlSugar.OceanBaseForOracle/OceanBase/SqlBuilder/OceanBaseForOracleExpressionContext.cs
+++ b/Src/Asp.NetCore2/SqlSugar.OceanBaseForOracle/OceanBase/SqlBuilder/OceanBaseForOracleExpressionContext.cs
@@ -76,7 +76,7 @@ namespace SqlSugar.OceanBaseForOracle
         public override string GetLimit()
         {
             int num = 1;
-            if (this.Case?.Num != 1)
+            if (this.Case?.Num > 1)
             {
                 num = this.Case.Num;
             }
diff --git a/Src/Asp.NetCore2/SqlSugar.TDSQLForPGODBC/TDSQLForPG/SqlBuilder/TDSQLForPGODBCExpressionContext.cs b/Src/Asp.NetCore2/SqlSugar.TDSQLForPGODBC/TDSQLForPG/SqlBuilder/TDSQLForPGODBCExpressionContext.cs
index 05cb81a82b1881f2fdabf9fbe6619142b01c71be..1c7720eb22b426ffe78b416ea49f00973a332e44 100644
--- a/Src/Asp.NetCore2/SqlSugar.TDSQLForPGODBC/TDSQLForPG/SqlBuilder/TDSQLForPGODBCExpressionContext.cs
+++ b/Src/Asp.NetCore2/SqlSugar.TDSQLForPGODBC/TDSQLForPG/SqlBuilder/TDSQLForPGODBCExpressionContext.cs
@@ -134,7 +134,7 @@ namespace SqlSugar.TDSQLForPGODBC
         public override string GetLimit()
         {
             int num = 1;
-            if (this.Case.Num != 1)
+            if (this.Case?.Num > 1)
             {
                 num = this.Case.Num;
             }
diff --git a/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Subquery/Items/SubTake.cs b/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Subquery/Items/SubTake.cs
index 534fa0a5df7b8fc591ac0da5acd681ab140df054..1bb530640668cf31a497e9d4a520a0ad3b27b083 100644
--- a/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Subquery/Items/SubTake.cs
+++ b/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Subquery/Items/SubTake.cs
@@ -82,14 +82,12 @@ namespace SqlSugar
             }
             else if (this.Context.GetLimit() != null)
             {
-                if (this?.Context?.Case?.HasWhere == true)
+                if (this.Context.Case == null)
                 {
-                    this.Context.Case.HasWhere = this.HasWhere;
-                }
-                if (this?.Context?.Case?.Num != 1)
-                {
-                    this.Context.Case.Num = num;
+                    this.Context.Case = new ExpressionContextCase();
                 }
+                this.Context.Case.HasWhere = this.HasWhere;
+                this.Context.Case.Num = num;
                 return this.Context.GetLimit();
             }
             else
diff --git a/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Subquery/Items/SubTop.cs b/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Subquery/Items/SubTop.cs
index 312ed677be2d3bcca758575710b7ee99db66c7ba..36a7da37959d0992209c9144a2174884d1965727 100644
--- a/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Subquery/Items/SubTop.cs
+++ b/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Subquery/Items/SubTop.cs
@@ -67,10 +67,11 @@ namespace SqlSugar
             }
             else if (this.Context.GetLimit()!=null)
             {
-                if (this?.Context?.Case?.HasWhere == true)
+                if (this.Context.Case == null)
                 {
-                    this.Context.Case.HasWhere = this.HasWhere;
+                    this.Context.Case = new ExpressionContextCase();
                 }
+                this.Context.Case.HasWhere = this.HasWhere;
                 return this.Context.GetLimit();
             }
             else