added alter table command to fluent query builder (progress)

include/matador/query/intermediates/query_alter_table_intermediate.hpp

@@ -30,22 +30,12 @@ public:
     query_add_foreign_key_constraint_intermediate foreign_keys(const std::vector<sql::column>& columns) const;
 };
 
-class query_drop_key_constraint_intermediate final : public query_intermediate {
-public:
-    using query_intermediate::query_intermediate;
-
-    void constraint(const std::string& name);
-    void primary_key();
-    void foreign_key(const std::string& name);
-    void foreign_keys(const std::vector<std::string>& names);
-};
-
 class query_alter_table_intermediate final : public query_intermediate {
 public:
     using query_intermediate::query_intermediate;
 
     query_add_key_constraint_intermediate add_constraint(const std::string& name);
-    query_drop_key_constraint_intermediate drop_constraint(const std::string& name);
+    executable_query drop_constraint(const std::string& name);
 };
 }
 

include/matador/sql/dialect.hpp

@@ -161,8 +161,8 @@ private:
     {dialect_token::Like,        "LIKE"},
     {dialect_token::Between,     "BETWEEN"},
     {dialect_token::In,          "IN"},
-    {dialect_token::OrderBy,    "ORDER BY"},
-    {dialect_token::GroupBy,    "GROUP BY"},
+    {dialect_token::OrderBy,     "ORDER BY"},
+    {dialect_token::GroupBy,     "GROUP BY"},
     {dialect_token::Asc,         "ASC"},
     {dialect_token::Desc,        "DESC"},
     {dialect_token::Offset,      "OFFSET"},
@@ -174,7 +174,8 @@ private:
     {dialect_token::NotNull,    "NOT NULL"},
     {dialect_token::PrimaryKey, "PRIMARY KEY"},
     {dialect_token::ForeignKey, "FOREIGN KEY"},
-    {dialect_token::AddConstraint,  "Add CONSTRAINT"},
+    {dialect_token::References, "REFERENCES"},
+    {dialect_token::AddConstraint,  "ADD CONSTRAINT"},
     {dialect_token::DropConstraint, "DROP CONSTRAINT"},
     {dialect_token::Begin,       "BEGIN TRANSACTION"},
     {dialect_token::Commit,      "COMMIT TRANSACTION"},