The Language of SQL- P5 ppt
The Language of SQL- P5 ppt
... stored in any number of
tables. The term relational is used to indicate that the tables are related to each
other. For example, let’s take the simple case of a database consisting of only two
tables: ... and the data they contain. The
common custom is to display a table as a grid of rows and columns. Each row
represents a record in the table. Each column represents a field...
The Language of SQL- P4 pptx
... that time.
Generally speaking, there are three major components of the SQL language. The
first is called DML, or Data Manipulation Language. This module of the language
allows you to retrieve, ... been The Logic of SQL. This is because, like all computer languages, the
language of SQL has much more to do with cold, hard logic than with English
vocabulary.
Nevertheless,...
The Language of SQL- P6 pptx
... statement.
The
FROM keyword is used to designate the table from which data is to be
retrieved. The name of the table follows the
FROM. In this case, the table name is
Customers.
As is the custom, ... such, the principles of
database design will be much more meaningful after you’re more aware of the
details and nuances of retrieving some data. So we’re going to tempor...
The Language of SQL- P15 pptx
... define the logic of the
CASE expression. The WHEN and THEN keywords
define a condition that is evaluated. If the value after the
WHEN is true, then the
result after
THEN is utilized. The WHEN and THEN ... value2 THEN result2
(repeat WHEN-THEN any number of times)
[ELSE DefaultResult]
END
As can be seen, the CASE expression utilizes a number of keywords other than
CASE: W...
The Language of SQL- P18 pptx
... rows
where the Quan tityPurchased column has a value of 5.
In the real world, the selection of data is often far from straightforward.
Accordingly, let’s now turn our attention to ways of specifying ... in the row
for William Smith. Therefore, it determines that both the William Smith and the
Natalie Lopez rows meet the condition.
Obviously, this isn’t what was meant. This...
The Language of SQL- P32 pptx
... Customers.CustomerID
Two blank lines were inserted to clearly separate the subquery from the rest of
the statement. The subquery is the middle section of the statement.
Using a Subquery as a Data Source 143
chapter ... or
view. Notice that the subquery is given a table alias of CashOrders, which allows
the columns in the subquery to be referenced in the main
SELECT....
The Language of SQL- P35 ppt
... first
SELECT has an original name of OrderDate. The first column of the second
SELECT has an original name of ReturnDate. To ensure that the first column in
the final result has the desired name, both OrderDate ... only pulls data that is in
both of the two sets being looked at. The
INTERSECT is analogous to the AND
operator and handles the second scenario stated at...
The Language of SQL- P37 pptx
... statements gives you the possi-
bility of much greater flexibility.
The term parameter in SQL statements is similar to the term variable, as it is used
in other computer languages. A parameter ... ure is executed, the calling program passes a value for the
parameter, and the SQL statement is executed as if that value were part of the
statement.
It should also be noted that...
The Language of SQL- P44 ppt
... database, and the best way often relates to the type of software that will
be used with the data.
Looking Ahead
This chapter covered the principles of database design. We went over the basics
of the normalization ... period?
■ Are there special analysis requirements for the data? If there is more than
one teacher for the same subject, do you want to be able to compare t...
Tài liệu PHP: The Good Parts: Delivering the Best of PHP- P5 ppt
... verify that the directory exists, we simply direct the browser to the first page
of the survey.
Now that we are on the first page of the survey (see Figure 7-2), the form is ready for
the user to ... have, of course, just scratched the surface of what the MySQLi class has to offer. You
can find the documentation for the class at http://www.php.net/mysqli, and y...
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