ESH_S_HDB_CONSTRAINT_SINGLE 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 "Constraint Clause on DB Table Attribute" 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_ESH_S_HDB_CONSTRAINT_SINGLE TYPE ESH_S_HDB_CONSTRAINT_SINGLE.
The ESH_S_HDB_CONSTRAINT_SINGLE table consists of various fields, each holding specific information or linking keys about Constraint Clause on DB Table Attribute data available in SAP. These include OPERATOR (Join Operator), CONSTRAINT_VAL (Constraint Value)... 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. .