By Allen G. Taylor
ISBN-10: 0470557419
ISBN-13: 9780470557419
The secret's SQL, and when you get the grasp of that, you could construct relational databases and get helpful info into and out of them comfortably. here is easy methods to constitution a database administration procedure with SQL, enforce the layout, guard your information, entry and paintings with it, continue your database, and lots more and plenty extra, utilizing the latest model of SQL.
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Extra info for SQL For Dummies, 7th Edition
Example text
The decimal point can “float” to different locations in the number, depending on the number’s value. 14159 — and yes, all three can be used as values for “pi” — each with a different precision. DOUBLE PRECISION data type The DOUBLE PRECISION data type gives you a double-precision floatingpoint number, the precision of which again depends on the implementation. Surprisingly, the meaning of the word DOUBLE also depends on the implementation. Double-precision arithmetic is primarily employed by scientific users.
Use the NUMERIC or DECIMAL type if your data has fractional positions, and use the INTEGER, SMALLINT, or BIGINT type if your data always consists of whole numbers. Use the NUMERIC type if you want to maximize portability, because a value that you define as NUMERIC (5,2), for example, holds the same range of values on all systems. info Chapter 2: SQL Fundamentals Approximate numerics Some quantities have such a large range of possible values (many orders of magnitude) that a computer with a given register size can’t represent all the values exactly.
A constraint is a restriction on what a column may contain. The characteristics of a table column, plus the constraints that apply to that column, determine the column’s domain. By applying constraints, you can prevent users from entering data into a column that falls outside the column’s domain. info 19 20 Part I: Basic Concepts In the auto dealership example, you can constrain the database to accept only those four values in the Color column. If a data entry operator then tries to enter in the Color column a value of, for example, forest green, the system refuses to accept the entry.
SQL For Dummies, 7th Edition by Allen G. Taylor
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