diff --git a/infra/common/src/main/java/org/apache/shardingsphere/infra/metadata/identifier/ShardingSphereIdentifier.java b/infra/common/src/main/java/org/apache/shardingsphere/infra/metadata/identifier/ShardingSphereIdentifier.java
index 7f54a7bad7eb6..f06d08f6e6595 100644
--- a/infra/common/src/main/java/org/apache/shardingsphere/infra/metadata/identifier/ShardingSphereIdentifier.java
+++ b/infra/common/src/main/java/org/apache/shardingsphere/infra/metadata/identifier/ShardingSphereIdentifier.java
@@ -38,8 +38,7 @@ public ShardingSphereIdentifier(final String value) {
     }
     
     public ShardingSphereIdentifier(final String value, final DatabaseType databaseType) {
-        isCaseSensitive = DatabaseTypedSPILoader.findService(DatabaseDialectIdentifierHandler.class, databaseType)
-                .map(DatabaseDialectIdentifierHandler::isCaseSensitive).orElse(false);
+        isCaseSensitive = DatabaseTypedSPILoader.findService(DatabaseDialectIdentifierHandler.class, databaseType).map(DatabaseDialectIdentifierHandler::isCaseSensitive).orElse(false);
         this.value = new CaseInsensitiveString(value);
     }
     
@@ -68,12 +67,15 @@ public boolean equals(final Object obj) {
         if (!(obj instanceof ShardingSphereIdentifier)) {
             return false;
         }
-        return isCaseSensitive ? value.toString().equals(((ShardingSphereIdentifier) obj).value.toString()) : value.equals(((ShardingSphereIdentifier) obj).value);
+        if (null == getValue() && null == ((ShardingSphereIdentifier) obj).getValue()) {
+            return true;
+        }
+        return isCaseSensitive ? String.valueOf(getValue()).equals(((ShardingSphereIdentifier) obj).getValue()) : value.equals(((ShardingSphereIdentifier) obj).value);
     }
     
     @Override
     public int hashCode() {
-        return isCaseSensitive ? value.toString().hashCode() : value.hashCode();
+        return isCaseSensitive ? String.valueOf(getValue()).hashCode() : value.hashCode();
     }
     
     @Override
diff --git a/infra/common/src/test/java/org/apache/shardingsphere/infra/metadata/identifier/ShardingSphereIdentifierTest.java b/infra/common/src/test/java/org/apache/shardingsphere/infra/metadata/identifier/ShardingSphereIdentifierTest.java
new file mode 100644
index 0000000000000..791194b6728a8
--- /dev/null
+++ b/infra/common/src/test/java/org/apache/shardingsphere/infra/metadata/identifier/ShardingSphereIdentifierTest.java
@@ -0,0 +1,72 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.shardingsphere.infra.metadata.identifier;
+
+import org.apache.shardingsphere.sql.parser.statement.core.value.identifier.IdentifierValue;
+import org.junit.jupiter.api.Test;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.CoreMatchers.not;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+class ShardingSphereIdentifierTest {
+    
+    @Test
+    void assertEqualsWithNotShardingSphereIdentifier() {
+        assertThat(new ShardingSphereIdentifier("foo"), not(new Object()));
+    }
+    
+    @Test
+    void assertEqualsWithNullValue() {
+        assertThat(new ShardingSphereIdentifier("foo"), not(new ShardingSphereIdentifier((String) null)));
+        assertThat(new ShardingSphereIdentifier((String) null), not(new ShardingSphereIdentifier("foo")));
+        assertThat(new ShardingSphereIdentifier((String) null), is(new ShardingSphereIdentifier((String) null)));
+    }
+    
+    @Test
+    void assertEqualsWithCaseSensitive() {
+        assertThat(new ShardingSphereIdentifier(new IdentifierValue("`foo`")), is(new ShardingSphereIdentifier(new IdentifierValue("`foo`"))));
+        assertThat(new ShardingSphereIdentifier(new IdentifierValue("`foo`")), is(new ShardingSphereIdentifier(new IdentifierValue("foo"))));
+        assertThat(new ShardingSphereIdentifier(new IdentifierValue("`foo`")), not(new ShardingSphereIdentifier("FOO")));
+    }
+    
+    @Test
+    void assertEqualsWithCaseInsensitive() {
+        assertThat(new ShardingSphereIdentifier("foo"), is(new ShardingSphereIdentifier("foo")));
+        assertThat(new ShardingSphereIdentifier("foo"), is(new ShardingSphereIdentifier("FOO")));
+    }
+    
+    @Test
+    void assertHashCodeWithCaseSensitive() {
+        assertThat(new ShardingSphereIdentifier(new IdentifierValue("`foo`")).hashCode(), is(new ShardingSphereIdentifier(new IdentifierValue("`foo`")).hashCode()));
+        assertThat(new ShardingSphereIdentifier(new IdentifierValue("`foo`")).hashCode(), not(new ShardingSphereIdentifier(new IdentifierValue("`FOO`")).hashCode()));
+    }
+    
+    @Test
+    void assertHashCodeWithCaseInsensitive() {
+        assertThat(new ShardingSphereIdentifier("foo").hashCode(), is(new ShardingSphereIdentifier("foo").hashCode()));
+        assertThat(new ShardingSphereIdentifier("foo").hashCode(), is(new ShardingSphereIdentifier("FOO").hashCode()));
+    }
+    
+    @Test
+    void assertToString() {
+        assertThat(new ShardingSphereIdentifier("foo").toString(), is("foo"));
+        assertThat(new ShardingSphereIdentifier("FOO").toString(), is("FOO"));
+        assertThat(new ShardingSphereIdentifier(new IdentifierValue("`foo`")).toString(), is("foo"));
+    }
+}