Update sample.txt

sample.txt

@@ -0,0 +1,21 @@
+{
+  "text": "find employees with salary greater than 50000",
+  "tables": {
+    "employees": ["id", "name", "salary"]
+  }
+}
+
+{
+  "text": "calculate total sales per region",
+  "tables": {
+    "sales": ["id", "amount", "region"]
+  }
+}
+
+{
+  "text": "show departments with more than 10 employees",
+  "tables": {
+    "departments": ["id", "name"],
+    "employees": ["employee_id", "department_id"]
+  }
+}