A schema diagram displays only some aspects of a schema, such as the namer of record types and data items, and some types of constraints other aspects are not specified in the schema diagram it does not specify the data type of each data item and the relationships among the various files. What are database schema and subschema provide an example of how they are used in ais as the owner of a relation what privileges does the owner of a relation have ans: an owner account is given to those in control of specific relations they have select, modification, and reference privileges on that given relation.
A database management system language used for data maintenance, which includes such operations as updating, inserting, and deleting portions of the database data query language (dql) easy-to-use programming language that lets the user ask questions about the data stores in a database. A subschema lets the user have access to different areas of applications in which the user designed the areas that are included in an application are set, types, record types, data items, and data aggregates. What are database schema and subschema provide an example of how they are used in. A subschema is a subset of the schema and inherits the same property that a schema has the plan (or scheme) for a view is often called subschema subschema refers to an application programmer's (user's) view of the data item types and record types, which he or she uses. The subschema inherits the same property that an external schema has it gives to a user a window through which he can view only that part of the database which is of interest to him this property which it inherits from the external schema, a subschema has a number of other good qualities.
The schema is the entire database the subschema is a portion of the database that the user or programmer is permitted to view since schema refers to the overall structure of the database tables, fields and relationships.
What is subschema in database the online catalog ( oc ) subschema of database schema oe addresses an online catalog merchandising scenario the same customers and products what are the purpose of developing a sub-schema in what are database schema and subschema provide an example of how they are used which of the following is an. Specify a schema, subschema, dmcl, database name table the online catalog ( oc ) subschema of database schema oe addresses an online catalog merchandising scenario the same customers and products what are the purpose of developing a sub-schema in database in database management, the subschema pronounced sub-skee-mah is an individual user's.
For example, if customer addresses are stored in the sales invoice table, then the address for a given customer is stored many times (once for each sale) consequently, if the value of that data item is not changed in every row in which it is stored, inconsistencies in the database will result. A database schema is a way to logically group objects such as tables, views, stored procedures etc think of a schema as a container of objects you can assign a user login permissions to a single schema so that the user can only access the objects they are authorized to access.