fix: include conversation history in SQL prompt template

pandasai/core/prompts/templates/generate_python_code_with_sql.tmpl

@@ -21,6 +21,10 @@ import pandas as pd
 ```
 {% endif %}
 {% include 'shared/vectordb_docs.tmpl' with context %}
+{% if context.memory.count() > 1 %}
+### PREVIOUS CONVERSATION
+{{ context.memory.get_previous_conversation() }}
+{% endif %}
 {{ context.memory.get_last_message() }}
 
 At the end, declare "result" variable as a dictionary of type and value in the following format:

tests/unit_tests/core/prompts/test_generate_python_code_with_sql_prompt.py

@@ -3,6 +3,7 @@
 import pytest
 
 from pandasai.core.prompts import GeneratePythonCodeWithSQLPrompt
+from pandasai.helpers.memory import Memory
 
 
 @pytest.fixture
@@ -17,6 +18,17 @@ def mock_context():
     return context
 
 
+@pytest.fixture
+def render_context():
+    """Context with real Memory for template rendering tests."""
+    context = Mock()
+    context.dfs = []
+    context.skills = []
+    context.config.direct_sql = True
+    context.vectorstore = None
+    return context
+
+
 def test_to_json(mock_context):
     """Test that to_json returns the expected structure with all required fields"""
     prompt = GeneratePythonCodeWithSQLPrompt(context=mock_context, output_type="code")
@@ -46,3 +58,36 @@ def test_to_json(mock_context):
         assert result["config"]["direct_sql"] is True
         assert "output_type" in result["config"]
         assert result["config"]["output_type"] == "code"
+
+
+def test_template_includes_previous_conversation(render_context):
+    """Test that the rendered template includes previous conversation history."""
+    memory = Memory(memory_size=10)
+    memory.add("What is the average salary?", is_user=True)
+    memory.add('result = {"type": "number", "value": 50000}', is_user=False)
+    memory.add("Show me the top 5 earners", is_user=True)
+    render_context.memory = memory
+
+    prompt = GeneratePythonCodeWithSQLPrompt(
+        context=render_context, last_code_generated=None, output_type="number"
+    )
+    rendered = prompt.to_string()
+
+    assert "PREVIOUS CONVERSATION" in rendered
+    assert "average salary" in rendered
+    assert "top 5 earners" in rendered
+
+
+def test_template_no_previous_conversation_for_single_message(render_context):
+    """Test that single-message memory does not show PREVIOUS CONVERSATION."""
+    memory = Memory(memory_size=10)
+    memory.add("What is the average salary?", is_user=True)
+    render_context.memory = memory
+
+    prompt = GeneratePythonCodeWithSQLPrompt(
+        context=render_context, last_code_generated=None, output_type="number"
+    )
+    rendered = prompt.to_string()
+
+    assert "PREVIOUS CONVERSATION" not in rendered
+    assert "average salary" in rendered