diff --git a/Hadoop/ZKLT.Hadoop/TableService.cs b/Hadoop/ZKLT.Hadoop/TableService.cs
index 99c1ed5..ff7332f 100644
--- a/Hadoop/ZKLT.Hadoop/TableService.cs
+++ b/Hadoop/ZKLT.Hadoop/TableService.cs
@@ -55,7 +55,7 @@ namespace ZKLT.Hadoop
                     {
                         StringBuilder _colstr = new StringBuilder();
                         var _column = table.Columns[i];
-                        if (_dbColumns.Any(x => x.Key == _column.Key))
+                        if (_dbColumns.Any(x => x.Key!.ToLower() == _column.Key!.ToLower()))
                         {
                             _colstr.Append($@"MODIFY `{_column.Key}`");
                         }