diff --git a/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/ArithmeticQueryColumn.java b/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/ArithmeticQueryColumn.java
index c5780e64..5eb00c9b 100644
--- a/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/ArithmeticQueryColumn.java
+++ b/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/ArithmeticQueryColumn.java
@@ -96,7 +96,7 @@ public class ArithmeticQueryColumn extends QueryColumn {
             sql.append(arithmeticInfos.get(i).toSql(queryTables, dialect, i));
         }
         if (StringUtil.isNotBlank(alias)) {
-            return WrapperUtil.withAlias(sql.toString(), dialect.wrap(alias));
+            return WrapperUtil.withAlias(sql.toString(), dialect.wrap(alias), dialect);
         }
         return sql.toString();
     }
@@ -141,7 +141,7 @@ public class ArithmeticQueryColumn extends QueryColumn {
             } else {
                 valueSql = String.valueOf(value);
             }
-            return index == 0 ? valueSql : symbol  + valueSql;
+            return index == 0 ? valueSql : symbol + valueSql;
         }
 
         @Override
diff --git a/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/CaseQueryColumn.java b/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/CaseQueryColumn.java
index 4a9743d5..1bd24d32 100644
--- a/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/CaseQueryColumn.java
+++ b/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/CaseQueryColumn.java
@@ -44,7 +44,7 @@ public class CaseQueryColumn extends QueryColumn implements HasParamsColumn {
     String toSelectSql(List<QueryTable> queryTables, IDialect dialect) {
         String sql = buildSql(queryTables, dialect);
         if (StringUtil.isNotBlank(alias)) {
-            return WrapperUtil.withAlias(sql, dialect.wrap(alias));
+            return WrapperUtil.withAlias(sql, dialect.wrap(alias), dialect);
         }
         return sql;
     }
diff --git a/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/CaseSearchQueryColumn.java b/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/CaseSearchQueryColumn.java
index c8d53f7d..96946703 100644
--- a/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/CaseSearchQueryColumn.java
+++ b/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/CaseSearchQueryColumn.java
@@ -37,7 +37,7 @@ public class CaseSearchQueryColumn extends QueryColumn implements HasParamsColum
     String toSelectSql(List<QueryTable> queryTables, IDialect dialect) {
         String sql = buildSql(queryTables, dialect);
         if (StringUtil.isNotBlank(alias)) {
-            return WrapperUtil.withAlias(sql, dialect.wrap(alias));
+            return WrapperUtil.withAlias(sql, dialect.wrap(alias), dialect);
         }
         return sql;
     }
diff --git a/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/FunctionQueryColumn.java b/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/FunctionQueryColumn.java
index 50f606e1..22bdba2b 100644
--- a/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/FunctionQueryColumn.java
+++ b/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/FunctionQueryColumn.java
@@ -78,7 +78,7 @@ public class FunctionQueryColumn extends QueryColumn implements HasParamsColumn
         if (StringUtil.isBlank(alias)) {
             return fnName + WrapperUtil.withBracket(sql);
         }
-        return fnName + WrapperUtil.withAlias(sql, dialect.wrap(alias));
+        return fnName + WrapperUtil.withAlias(sql, dialect.wrap(alias), dialect);
     }
 
     @Override
diff --git a/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/SelectQueryColumn.java b/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/SelectQueryColumn.java
index 0256bede..b10f48b4 100644
--- a/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/SelectQueryColumn.java
+++ b/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/SelectQueryColumn.java
@@ -45,7 +45,7 @@ public class SelectQueryColumn extends QueryColumn implements HasParamsColumn {
     String toSelectSql(List<QueryTable> queryTables, IDialect dialect) {
         String selectSql = dialect.forSelectByQuery(queryWrapper);
         if (StringUtil.isNotBlank(selectSql) && StringUtil.isNotBlank(alias)) {
-            selectSql = WrapperUtil.withAlias(selectSql, dialect.wrap(alias));
+            selectSql = WrapperUtil.withAlias(selectSql, dialect.wrap(alias), dialect);
         }
         return selectSql;
     }
diff --git a/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/SelectQueryTable.java b/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/SelectQueryTable.java
index fb735c57..565c3b68 100644
--- a/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/SelectQueryTable.java
+++ b/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/SelectQueryTable.java
@@ -49,7 +49,7 @@ public class SelectQueryTable extends QueryTable {
     public String toSql(IDialect dialect) {
         String sql = dialect.buildSelectSql(queryWrapper);
         if (StringUtil.isNotBlank(alias)) {
-            return WrapperUtil.withAlias(sql, dialect.wrap(alias));
+            return WrapperUtil.withAlias(sql, dialect.wrap(alias), dialect);
         } else {
             return WrapperUtil.withBracket(sql);
         }
diff --git a/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/StringFunctionQueryColumn.java b/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/StringFunctionQueryColumn.java
index 25763d40..582bafc1 100644
--- a/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/StringFunctionQueryColumn.java
+++ b/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/StringFunctionQueryColumn.java
@@ -65,7 +65,7 @@ public class StringFunctionQueryColumn extends QueryColumn {
         if (StringUtil.isBlank(alias)) {
             return fnName + WrapperUtil.withBracket(sql);
         }
-        return fnName + WrapperUtil.withAlias(sql, dialect.wrap(alias));
+        return fnName + WrapperUtil.withAlias(sql, dialect.wrap(alias), dialect);
     }
 
     @Override
diff --git a/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/WrapperUtil.java b/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/WrapperUtil.java
index 8b56340d..b1a91d24 100644
--- a/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/WrapperUtil.java
+++ b/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/WrapperUtil.java
@@ -20,6 +20,7 @@ import com.mybatisflex.core.FlexConsts;
 import com.mybatisflex.core.constant.SqlConsts;
 import com.mybatisflex.core.dialect.DialectFactory;
 import com.mybatisflex.core.dialect.IDialect;
+import com.mybatisflex.core.dialect.impl.OracleDialect;
 import com.mybatisflex.core.util.ClassUtil;
 import com.mybatisflex.core.util.EnumWrapper;
 import com.mybatisflex.core.util.StringUtil;
@@ -145,11 +146,15 @@ class WrapperUtil {
         return SqlConsts.BRACKET_LEFT + sql + SqlConsts.BRACKET_RIGHT;
     }
 
-    static String withAlias(String sql, String alias) {
-        return SqlConsts.BRACKET_LEFT + sql + SqlConsts.BRACKET_RIGHT + SqlConsts.AS + alias;
+    static String withAlias(String sql, String alias, IDialect dialect) {
+        return SqlConsts.BRACKET_LEFT + sql + SqlConsts.BRACKET_RIGHT + getAsKeyWord(dialect) + alias;
     }
 
     static String buildAlias(String alias, IDialect dialect) {
-        return StringUtil.isBlank(alias) ? SqlConsts.EMPTY : SqlConsts.AS + dialect.wrap(alias);
+        return StringUtil.isBlank(alias) ? SqlConsts.EMPTY : getAsKeyWord(dialect) + dialect.wrap(alias);
+    }
+
+    private static String getAsKeyWord(IDialect dialect){
+        return dialect instanceof OracleDialect ? SqlConsts.BLANK : SqlConsts.AS;
     }
 }