Microsoft Word - Sam's Teach Yourself MySQL in 21 Days - SAMS.doc
Apart from assigning values, you can also compare. You can use == for testing equality != for not equal to < for smalle ...
if ($price > 100) echo "This is expensive"; is correct syntax and will print the message only if $price is greater than 100. ...
Control Structures: for A more complex form of looping is available in the form of the for loop. This takes the following form: ...
Figure 15.1 Exiting a loop using break and continue. Control Structures: include() and require() PHP gives you the include() and ...
When you define a user-defined function, you specify how it should execute and what values (if any) it should return. You can op ...
$myarray["R"] = 'red'; $myarray["G"] = 'green'; $myarray["B"] = 'blue'; Now, to pass through the array, you would do something l ...
the logged-in user with an active connection Creating and Dropping Databases mysql_create_db Creates a MySQL database mysql_drop ...
mysql_field_flags Returns the flags associated with the specified field in a result mysql_insert_id (^) Returns the ID generated ...
Creating a Database You can create a database by using the following: mysql_create_db(database_name[, link_identifier]); The lin ...
echo "Error: ".mysql_errno()."; error description: ".mysql_error()."<br>\n"; } Then, whenever you want to handle an error, ...
forward one row through the array that resulted from the query. This happens until the pointer reaches the end of the result set ...
All date and time data types have a range of legal values and a "zero" value to which a field will be set if you attempt to put ...
You can specify time without delimiters, as in 083220 or 83220. However, be careful before getting too minimalist: MySQL reads t ...
When specifying a date as a string, you should always use at least 6 characters. This is because dates, such as 98-12 or 98 , wh ...
Getting Day Information There are four functions for converting a date to a day number: DAYOFYEAR(date) DAYOFMONTH(date) D ...
mysql> SELECT DAYOFWEEK('0-2-1'); results in the following: +--------------------+ | DAYOFWEEK('0-2-1') | +------------------ ...
| NULL | +----------------+ Extracting Years, Quarters, Months, and Weeks MySQL has a range of function for extracting numerical ...
You can override the default behavior by adding the firstday parameter. Instead of 0 representing Sunday, 1=Monday, and so on, y ...
%T 24-hour time (hh:mm:ss) %Y Numeric year, 4 digits %y Numeric year, 2 digits %m Month with leading 0 (01, 02...12) %c Month wi ...
Extracting Hours, Minutes, and Seconds HOUR(time) MINUTE(time) SECOND(time) These functions can be used to easily extract ...
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