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Most packaged application programs that have database access as an important part of their capabilities support ODBC, range from multi-million dollar enterprise class applications like Enterprise Resource Planning (ERP) and Supply Chain Management (SCM) to PC applications such as spreadsheets, query tools, and reporting programs Microsoft's focus has moved beyond ODBC to higher-level interfaces (such as OLE/DB) and more recently to ADO (Active Data Objects), but these new interfaces are layered on top of ODBC for relational database access, and it remains a key cross-platform database access technology..

The fact that the batch is compiled as an undivided entity has interesting implications for syntax errors. Results will vary according to whether the syntax error occurs in a statement or in the name of a database object. If a DBA writes a batch with a statement that contains a syntax error, the whole batch will fail to execute. Consider the following batch:

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Insert into Part (Make, Model, Type) Values ('Toshiba', 'Port g 7020CT', 'Notebook') Selec * from Part

The existence of published SQL standards has spawned quite a few exaggerated claims about SQL and applications portability. Diagrams such as the one in Figure 3-1 are frequently drawn to show how an application using SQL can work interchangeably with any SQL-based database management system. In fact, the holes in the SQL-89 standard and the current differences between SQL dialects are significant enough that an application must always be modified when moved from one SQL database to another. These differences, many of which were eliminated by the SQL2 standard but have not yet implemented in commercial products, include:

It consists of two commands. The second contains a syntax error a missing letter in the Select keyword. If you execute this batch in Query Analyzer, SQL Server will not compile or execute but will return the following error:

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Server: Msg 170, Level 15, State 1, Line 3 Line 3: Incorrect syntax near 'Selec'

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If you make a typo in the name of the database object (for instance, in a table or column name), the situation is very different. Note that the name of the table in the following Insert statement is incorrect:

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Insert into art (Make, Model, Type) Values ('Toshiba', 'Portege 7020CT', 'Notebook') Select * from Part

In this example, the application will notice an error and stop execution as soon as it encounters it:

Error codes The SQL-89 standard does not specify the error codes to be returned when SQL detects an error, and all of the commercial implementations use their own set of error codes The SQL2 standard specifies standard error codes Data types The SQL-89 standard defines a minimal set of data types, but it omits some of the most popular and useful types, such as variable-length character strings, dates and times, and money data The SQL2 standard addresses these, but not "new" data types such as graphics and multimedia objects System tables The SQL-89 standard is silent about the system tables that provide information regarding the structure of the database itself Each vendor has its own structure for these tables, and even IBM's four SQL implementations differ from one another.

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Server: Msg 208, Level 16, State 1, Line 1 Invalid object name 'art'.

SQL Server executes the batch in three steps: it parses, compiles, then executes. In the first phase, SQL Server verifies batch syntax. It focuses on the sequence of keywords, operators, and identifiers. The first batch used a statement with a typo in a keyword. SQL Server picked up the error during the parsing phase. The error in the second batch (an invalid object name) was picked up during execution. To further demonstrate this fact, let s investigate the following example, where the error is in the second statement:

The tables are standardized in SQL2, but only at the higher levels of compliance, which are not yet provided by most vendors Interactive SQL The standard specifies only the programmatic SQL used by an application program, not interactive SQL For example, the SELECT statement used to query the database in interactive SQL is absent from the SQL-89 standard Again, the SQL2 standard addressed this issue, but long after all of the major DBMS vendors had well-established interactive SQL capabilities Programmatic interface The original standard specifies an abstract technique for using SQL from within an applications program written in COBOL, C, FORTRAN, and other programming languages No commercial SQL product uses this technique, and there is considerable variation in the actual programmatic interfaces used The SQL2 standard specifies an embedded SQL interface for popular programming languages but not a call-level interface Dynamic SQL.

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