It complements the Data Definition Language (DDL), which is used to add and delete database objects, and the Data Manipulation Language (DML), which is used to retrieve, insert and modify the contents of a database.
Ọ na-agụnye Data Definition Language (DDL), nke ejiri iji gbakwunye na ihichapụ ihe nchekwa data, na Asụsụ Ntanye Data (DML) iji weghachite, tinye, ma gbanwee ọdịnaya nke nchekwa data.