diff --git a/minisql/src/internals/schema.rs b/minisql/src/internals/schema.rs
index c23c24a..4f2bf54 100644
--- a/minisql/src/internals/schema.rs
+++ b/minisql/src/internals/schema.rs
@@ -11,9 +11,9 @@ use std::collections::HashMap;
 #[derive(Debug)]
 pub struct TableSchema {
     table_name: TableName, // used for descriptive errors
-    pub primary_key: ColumnPosition,
-    pub column_name_position_mapping: BiMap<ColumnName, ColumnPosition>,
-    pub types: Vec<DbType>,
+    primary_key: ColumnPosition,
+    column_name_position_mapping: BiMap<ColumnName, ColumnPosition>,
+    types: Vec<DbType>,
 }
 
 pub type TableName = String;
@@ -32,6 +32,10 @@ impl TableSchema {
         &self.table_name
     }
 
+    pub fn column_type(&self, column_position: ColumnPosition) -> DbType {
+        self.types[column_position]
+    }
+
     fn get_column(&self, column_name: &ColumnName) -> DbResult<(DbType, ColumnPosition)> {
         match self.column_name_position_mapping.get_by_left(column_name) {
             Some(column_position) => match self.types.get(*column_position) {
diff --git a/minisql/src/internals/table.rs b/minisql/src/internals/table.rs
index e5506e0..36abf76 100644
--- a/minisql/src/internals/table.rs
+++ b/minisql/src/internals/table.rs
@@ -206,7 +206,7 @@ impl Table {
                     let column_name: ColumnName = self
                         .schema
                         .column_name_from_column_position(column_position)?;
-                    let type_ = self.schema.types[column_position];
+                    let type_ = self.schema.column_type(column_position);
                     Err(Error::ValueDoesNotMatchExpectedType(
                         self.table_name().clone(),
                         column_name,