"A description of a database generated by the data definition language (DDL) of the database management system (DBMS)." (Microsoft Corporation, "SQL Server 7.0 System Administration Training Kit", 1999)
"The structure of a database, which includes the definitions of the objects. The database schema includes the tables, columns, defaults, indexes, and relationships." (Microsoft Corporation, "Microsoft SQL Server 7.0 Data Warehouse Training Kit", 2000)
"Database schema refers to the names of tables, fields, data types, and primary and foreign keys of a database. Database schema is also known as the database structure." (Anthony Sequeira & Brian Alderman, "The SQL Server 2000 Book", 2003)
"A group of related database objects assigned to a database user. A schema contains tables, views, indexes, sequences, and SQL code. The schema name can be used to qualify objects that are not owned by the user referencing the objects." (Bob Bryla, "Oracle Database Foundations", 2004)
"In the SQL-92 standard, a collection of database objects that are owned by a single user and form a single namespace. A namespace is a set of objects that cannot have duplicate names" (Thomas Moore, "EXAM CRAM™ 2: Designing and Implementing Databases with SQL Server 2000 Enterprise Edition", 2005)
"A description of data that provides context and structure. There are many types of schemas, including database schemas and XML schemas." (Tom Petrocelli, "Data Protection and Information Lifecycle Management", 2005)
"The design of the physical database that defines the tables in the database that correspond to physical data objects. The physical database schema is often referred to by CDI vendors as their data model." (Jill Dyché & Evan Levy, "Customer Data Integration: Reaching a Single Version of the Truth", 2006)
"A grouping mechanism for objects inside a database. A schema is owned by a user, and various users can be assigned permission to use objects in a schema. In SQL Server 2005 the schema is separated from the object owner and is used as the third part of the four-part naming system for objects, which is server.database.schema.object." (Marilyn Miller-White et al, "MCITP Administrator: Microsoft® SQL Server™ 2005 Optimization and Maintenance 70-444", 2007)
"A group of database objects that make up a given namespace. Objects include tables, views, and statements that grant or revoke access to other securable objects. No two objects in any namespace can have the same name." (Robert D. Schneider and Darril Gibson, "Microsoft SQL Server 2008 All-In-One Desk Reference For Dummies", 2008)
"In SQL Server 2000, the schema identified the model of the database. For example, the tables, VIEWs, data types, and so on would be identified as the schema. In SQL Server 2005, the term schema is used to identify a collection of database entities within a single namespace. Schemas are the owners of the objects, and one or more users can be the owners of schemas." (Darril Gibson, "MCITP SQL Server 2005 Database Developer All-in-One Exam Guide", 2008)
"A collection of tables that forms a database." (Paulraj Ponniah, "Data Warehousing Fundamentals for IT Professionals", 2010)
"A conceptual data model that shows all the relationships among the data elements under consideration in a given context; the collection of table definitions in a relational database." (Toby J Teorey, "Database Modeling and Design" 4th Ed, 2010)
"In database design theory, the overall logical design of a database. In a SQL DBMS, a group of tables and supporting elements such as views and indexes." (Jan L Harrington, "SQL Clearly Explained 3rd Ed. ", 2010)
"(1) The logical or physical definition of data elements, physical characteristics, and relationships. (2) The diagram representing a logical data model." (Craig S Mullins, "Database Administration: The Complete Guide to DBA Practices and Procedures 2nd Ed", 2012)
"The names of tables, fields, data types, and primary and foreign keys of a database." (Microsoft, "SQL Server 2012 Glossary", 2012)
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