diff --git a/ydb/core/kqp/provider/yql_kikimr_exec.cpp b/ydb/core/kqp/provider/yql_kikimr_exec.cpp
index 78546a2058d0..42b62863492a 100644
--- a/ydb/core/kqp/provider/yql_kikimr_exec.cpp
+++ b/ydb/core/kqp/provider/yql_kikimr_exec.cpp
@@ -1318,21 +1318,21 @@ class TKiSinkCallableExecutionTransformer : public TAsyncCallbackTransformer<TKi
                         auto columnTuple = item.Cast<TExprList>();
                         auto columnName = columnTuple.Item(0).Cast<TCoAtom>();
                         alter_columns->set_name(TString(columnName));
-
                         auto alterColumnList = columnTuple.Item(1).Cast<TExprList>();
-                        if (TString(alterColumnList.Item(0).Cast<TCoAtom>()) = "setDefault") {
+                        auto alterColumnAction = TString(alterColumnList.Item(0).Cast<TCoAtom>());
+                        if (alterColumnAction == "setDefault") {
                             auto setDefault = alterColumnList.Item(1).Cast<TCoAtomList>();
                             auto func = TString(setDefault.Item(0).Cast<TCoAtom>());
                             auto arg = TString(setDefault.Item(1).Cast<TCoAtom>());
                             if (func != "nextval") {
-                                ctx.AddError(TIssue(ctx.GetPosition(alterColumnList.Pos()),
+                                ctx.AddError(TIssue(ctx.GetPosition(setDefault.Pos()),
                                     TStringBuilder() << "Unsupported function to set default: " << func));
                                 return SyncError();
                             }
                             auto fromSequence = alter_columns->mutable_from_sequence();
                             fromSequence->set_name(arg);
-                        } else {
-                            auto families = columnTuple.Item(1).Cast<TCoAtomList>();
+                        } else if (alterColumnAction == "setFamily") {
+                            auto families = alterColumnList.Item(1).Cast<TCoAtomList>();
                             if (families.Size() > 1) {
                                 ctx.AddError(TIssue(ctx.GetPosition(families.Pos()),
                                     "Unsupported number of families"));
@@ -1341,6 +1341,10 @@ class TKiSinkCallableExecutionTransformer : public TAsyncCallbackTransformer<TKi
                             for (auto family : families) {
                                 alter_columns->set_family(TString(family.Value()));
                             }
+                        } else {
+                            ctx.AddError(TIssue(ctx.GetPosition(alterColumnList.Pos()),
+                                    TStringBuilder() << "Unsupported action to alter column"));
+                            return SyncError();
                         }
                     }
                 } else if (name == "addColumnFamilies" || name == "alterColumnFamilies") {
diff --git a/ydb/core/kqp/provider/yql_kikimr_type_ann.cpp b/ydb/core/kqp/provider/yql_kikimr_type_ann.cpp
index aca9507393e8..6dd19301f2ac 100644
--- a/ydb/core/kqp/provider/yql_kikimr_type_ann.cpp
+++ b/ydb/core/kqp/provider/yql_kikimr_type_ann.cpp
@@ -1361,8 +1361,10 @@ virtual TStatus HandleCreateTable(TKiCreateTable create, TExprContext& ctx) over
                             << " Column: \"" << name << "\" does not exist"));
                         return TStatus::Error;
                     }
-                    if (TString(columnTuple.Item(1).Cast<TExprList>().Item(0).Cast<TCoAtom>()) == "setDefault") {
-                        auto setDefault = columnTuple.Item(1).Cast<TExprList>().Item(1).Cast<TCoAtomList>();
+                    auto alterColumnList = columnTuple.Item(1).Cast<TExprList>();
+                    auto alterColumnAction = TString(alterColumnList.Item(0).Cast<TCoAtom>());
+                    if (alterColumnAction == "setDefault") {
+                        auto setDefault = alterColumnList.Item(1).Cast<TCoAtomList>();
                         auto func = TString(setDefault.Item(0).Cast<TCoAtom>());
                         auto arg = TString(setDefault.Item(1).Cast<TCoAtom>());
                         if (func != "nextval") {
@@ -1375,15 +1377,19 @@ virtual TStatus HandleCreateTable(TKiCreateTable create, TExprContext& ctx) over
                                 TStringBuilder() << "Function nextval has exactly one argument"));
                             return TStatus::Error;
                         }
-                    } else {
-                        auto families = columnTuple.Item(1);
-                        if (families.Cast<TCoAtomList>().Size() > 1) {
+                    } else if (alterColumnAction == "setFamily") {
+                        auto families = alterColumnList.Item(1).Cast<TCoAtomList>();
+                        if (families.Size() > 1) {
                             ctx.AddError(TIssue(ctx.GetPosition(nameNode.Pos()), TStringBuilder()
                                 << "AlterTable : " << NCommon::FullTableName(table->Metadata->Cluster, table->Metadata->Name)
                                 << " Column: \"" << name
                                 << "\". Several column families for a single column are not yet supported"));
                             return TStatus::Error;
                         }
+                    } else {
+                        ctx.AddError(TIssue(ctx.GetPosition(nameNode.Pos()),
+                                TStringBuilder() << "Unsupported action to alter column"));
+                        return TStatus::Error;
                     }
                 }
             } else if (name == "addIndex") {
diff --git a/ydb/library/yql/sql/v1/query.cpp b/ydb/library/yql/sql/v1/query.cpp
index 28762c779389..495547b28d95 100644
--- a/ydb/library/yql/sql/v1/query.cpp
+++ b/ydb/library/yql/sql/v1/query.cpp
@@ -1335,7 +1335,8 @@ class TAlterTableNode final: public TAstListNode {
                 for (const auto& family : col.Families) {
                     familiesDesc = L(familiesDesc, BuildQuotedAtom(family.Pos, family.Name));
                 }
-                columnDesc = L(columnDesc, Q(familiesDesc));
+
+                columnDesc = L(columnDesc, Q(Y(Q("setFamily"), Q(familiesDesc))));
                 columns = L(columns, Q(columnDesc));
             }
             actions = L(actions, Q(Y(Q("alterColumns"), Q(columns))));