Microsoft Word - Sam's Teach Yourself MySQL in 21 Days - SAMS.doc
1 row in set (0.00 sec) Note For columns of the TEXT and BLOB data type, you have no option but to make a partial index of the c ...
Unique Keys By definition, a unique index allows only unique values in the column. When you construct a WHERE clause to access o ...
table's primary key. In contrast, keys that are merely unique can be added purely for performance reasons. MySQL requires you to ...
way to refer to each entry in the table. A synthetic key for each customer will never change, irrespective of what other changes ...
MySQL will not allow you to create a key on a column with NULL values. A table in MySQL cannot contain more than 16 keys. Wh ...
You've looked at how to apply keys and whether you should. You can use a key to make lookups more efficient, to help performance ...
b. A table of products available to order from your online shop. Duplicates are not allowed. c. A table that records the sales t ...
happy, and then management decided to change database products. They heard about this absolutely incredible database called MySQ ...
Getting to the Data Every interface shares the same concept for accessing data. There are a series of steps that are the same fo ...
records can go. You will learn more about this in the upcoming days. You'll see how to pass variables from your application to t ...
Q&A Q: How are my queries executed? A: The SQL statements that you embed in your program are passed to the driver. This driv ...
Click Start, Settings, Control Panel. You should see an icon that is titled ODBC Data Sources (32 bit). Double-click it. The Da ...
Figure 13.3 Data Sources dialog box. From here, click the Close button. You will add the Data Source Name later. Congratulation ...
Figure 13.5 The Data Sources Administrator. The Data Source Administrator consists of 7 panels. The first panel, User DSN, sets ...
Figure 13.7 Creating a new Data Source. The next window to appear is the TcX mysql Driver Configuration window. This window con ...
responded. Microsoft has released many tools to aid a developer who is using ODBC to connect to a database. They include ODBCDir ...
<% Dim Conn Dim Cmd Set Conn = Server.CreateObject("ADODB.Connection") Set Cmd = Server.CreateObject("ADODB.Command") Conn.Co ...
As you can see, the anatomy of an Active Server Page is not very different from a regular Web page. The only difference is the c ...
VBScript Declarations Variables can be of only one type—variant. A variant is a variable that can hold any value—a string, numbe ...
Commenting Your Code You can also use comments in your server pages. A comment is denoted by a single quote ('). There are no bl ...
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