GRFN_S_QUERY_SELECTION is a standard SAP Structure so does not store data like a database table does. It can be used to define the fields of other actual tables or to process "Query selection" Information within sap ABAP programs. This is done by declaring abap internal tables, work areas or database tables based on this Structure. These can then be used to store and process the required data appropriately. i.e. DATA: wa_GRFN_S_QUERY_SELECTION TYPE GRFN_S_QUERY_SELECTION.
The GRFN_S_QUERY_SELECTION table consists of various fields, each holding specific information or linking keys about Query selection data available in SAP. These include SIGN (Long text for DataMart), OPTION (Long text for DataMart), LOW (Long text for DataMart), HIGH (Long text for DataMart)... See below for full list along with technical details, documentation, text table, check tables, foreign key relationships, conversion routines, relevant tcodes and example ABAP select code etc. .