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The Oracle DBMS has a different architecture. Each instance of the DBMS software manages only one database. However, each database user gets a distinct schema for storage of database objects owned by that user. So, in Oracle a schema is much like what SQL Server calls a database. Oracle has a tool called SQL Developer that is functionally similar to the SQL Server Management Studio. Figure 2-4 shows SQL Developer with the INVENTORY schema expanded down to the columns in the ARTIST_CDS table. Oracle was the first commercially available RDBMS, and since it was created long before there was an SQL standard, it should be no surprise that it is architecturally different. In 1, I stated that a database is a collection of data organized in a structured format that is defined by the metadata that describes that structure. In both SQL Server and Oracle you can see how this definition applies. Both systems (and any true RDBMS you re working with) collect the data in a structured format and define that data by the use of schemas, which contain the metadata. This definition can also be applied to the SQL standard and its construction of the SQL environment and catalogs. SQL data is stored in an organized format within base tables. These base tables are contained within a schema, which defines those tables, thereby defining the data. So even though the SQL:2006 standard doesn t actually define the term database, it nonetheless supports the concept of a database, as do the RDBMS products that implement SQL.
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Up to this point in the book, I have provided you with a lot of conceptual and background information. The reason for this is that I want you have a basic foundation in SQL before you actually start writing SQL statements. I believe that, with this information, you will be better able to grasp the logic behind the SQL code that you create and the reason for creating it, and I have no doubt that you re more than ready to start writing those statements. However, before I actually start getting into the meat of SQL, there s one more topic that I need to cover briefly object identifiers. An identifier is a name given to an SQL object. The name can be up to (but not including) 128 characters and must follow defined conventions. An identifier can be assigned to any object that you can create with SQL statements, such as domains, tables, columns, views, or schemas. The SQL:2006 standard defines two types of identifiers: regular identifiers and delimited identifiers. Regular identifiers are fairly restrictive and must follow specific conventions:
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The names are not case-sensitive. For example, Artist_Names is the same as ARTIST_ NAMES and artist_names. Only letters, digits, and underscores are allowed. For example, you can create identifiers such as First_Name, 1stName, or FIRST_NAME. Notice that the underscore is the only valid character that may be used as a separator between words. Spaces are not acceptable nor are dashes (dashes are interpreted as subtraction operators). No SQL reserved keywords can be used.
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NOTE
A keyword is a word that is part of the SQL lexicon. There are two types of SQL keywords: reserved and nonreserved. As the name suggests, the reserved keywords cannot be used for any purpose other than as they are intended to be used within an SQL statement. The nonreserved words have no such restriction. For a complete list of the SQL keywords, see Appendix B.
SQL is insensitive to case, with regard to regular identifiers. All names are changed to uppercase by SQL when they are stored, which is why 1stName and 1STNAME are read as identical values. As already mentioned, case insensitivity is the default behavior in most RDBMSs and while the default can be changed in some products, I highly recommend that you don t change it because it s not consistent with the SQL standard, and it leads to compatibility problems should you use other products to access your data. Delimited identifiers are not as restrictive as regular identifiers, but they still must follow specific conventions:
The identifier must be enclosed in a set of double quotation marks, such as the ArtistNames identifier. The quotation marks are not stored in the database, but all other characters are stored as they appear in the SQL statement.
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