E3CSKU 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 "Cost elements: Text segment" 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_E3CSKU TYPE E3CSKU.
The E3CSKU table consists of various fields, each holding specific information or linking keys about Cost elements: Text segment data available in SAP. These include SPRAS (Language Key), KTEXT (Text for Criterion), LTEXT (Text, length 40)... 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. .