CreateQuery database_for_dict_01018 table_for_dict (children 4) Identifier database_for_dict_01018 Identifier table_for_dict Columns definition (children 1) ExpressionList (children 3) ColumnDeclaration key_column (children 1) DataType UInt64 ColumnDeclaration second_column (children 1) DataType UInt8 ColumnDeclaration third_column (children 1) DataType String Storage definition (children 2) Function MergeTree (children 1) ExpressionList Identifier key_column