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SQL in a Nutshell is a realistic and invaluable command connection with the most recent free up of the dependent question Language (SQL99), assisting readers find out how their favourite database product helps any average SQL command. This booklet offers all the SQL instructions and describes its use in either advertisement (Microsoft SQL Server 2000 and Oracle 8i) and open resource (MySQL, PostgreSQL 7.0) implementations. every one command reference contains the command syntax (by seller, if the syntax differs throughout implementations), an outline, and informative examples that illustrate very important options and makes use of. SQL in a Nutshell is greater than a handy reference advisor for knowledgeable SQL programmers, analysts, and database directors. it is also an exceptional studying source for amateur and auxiliary SQL clients.
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Extra resources for SQL in a Nutshell: A Desktop Quick Reference
66 $70000 2E5 7E-3 As the example illustrates, SQL Server allows signed or unsigned numerals, in scientific or normal notation. And since SQL has a money datatype, even a dollar sign can be included. SQL does not allow other symbols in numeric literals (besides 0 1 2 3 4 5 6 7 8 9 + - $ . E e), so do not include commas. Most data bases interpret a comma in a numeric literal as a list item separator. Thus, the literal value 3,000 would be interpreted by the database as 3 and, separately, 000. Oracle provides support for an interesting literal type called a interval literal, which is used to specify an interval of time.
Stores the date and time. The optional WITH TIME ZONE keyword allows the declaration of a specially defined time zone value. Holds the time of day, including time zone. Stores variable-length character strings with spaces trimmed. Processing NULLS Most databases allow any of their supported datatypes to store NULL values. Inex perienced SQL programmers and developers tend to think of NULL as zero or blank. In fact, NULL is neither of these. In the relational database world, NULL literally means that the value is unknown or indeterminate.
Finally, an indicator also may be specified to retain the condition of the host variable, if the function is a precom piled Pro*C/C++ routine. Example This example creates a simple stored procedure, then calls it independently: CREATE PROCEDURE update_employee_salary (emp_id NUMBER, updated_salary NUMBER) IS BEGIN UPDATE employee SET salary = updated_salary WHERE employee_id =emp_id ; END; CALL update_employee_salary(1517, 95000); CASE The CASE function provides IF-THEN-ELSE functionality within a SELECT or UPDATE statement.
SQL in a Nutshell: A Desktop Quick Reference by Kevin Kline, Visit Amazon's Brand Hunt Page, search results, Learn about Author Central, Brand Hunt, , Visit Amazon's Daniel Kline Page, search results, Learn about Author Central, Daniel Kline,