Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / sekar
SQL JOIN:
type of join
1.cross join
Ans :
cross join not support where clause.
The size of cartesian product result set is number
of row in first table multiplied by number of row in second
table.
2.inner join
Ans: Inner join is used to retrive the matching record
first and second table.
3.self join
Ans:Self join is used to retrive matching record in same
table.
4.right outer join
Ans:right outer join is used to return the all the value of
second table and plus matching record(innerjoin) of both
table.
5.left outer join
Ans:left outer join is used to return the all the value of
first table and plus matching record(innerjoin) of both
table.
6 full outer join
Example:
<?php
$con = mysql_connect("localhost","root","") or die ("could
not connet".mysql_error());
$db = mysql_select_db("sekar",$con) or die ("could not
connet".mysql_error());
//$sql = mysql_query("create table emp2(eno int(4) not null
auto_increment primary key, ename varchar(20), sal int
(10))") or die ("could not connet".mysql_error());
//$record = mysql_query("insert into std2(sno, sname, mark)
values (4, 'krish', 100)") or die("could not
add".mysql_error());
//$record = mysql_query("insert into emp2(eno, ename, sal)
values (4, 'kanna', 10000)") or die("could not
add".mysql_error());
/*cross join
$query = "select * from std2, emp2";
$query = "select s.sname, s.mark, e.ename,e.sal from std2
s,emp2 e";
*/
/*inner join
$query = "select s.sname, s.mark, e.ename,e.sal from std2 s
inner join emp2 e on(s.sname= e.ename)";
*/
/*self join
$query = "select s.sname, s.mark, e.sname from std2 s join
std2 e on(s.sname= e.sname)";
*/
/*Right outer join
$query = "select s.sname, s.mark, e.ename,e.sal from std2 s
left outer join emp2 e on(s.sname= e.ename)";
*/
/*Right outer join
$query = "select s.sname, s.mark, e.ename,e.sal from std2 s
right outer join emp2 e on(s.sname= e.ename)";
*/
//full outer join
$query = "select s.sname, s.mark, e.ename,e.sal from std2 s
join emp2 e on(s.sname= e.ename)";
$result= mysql_query($query) or die("could not
select".mysql_error());
echo "<table border='1' cellpadding='0' cellspacing='0'
width='700'>";
while($rec = mysql_fetch_array($result))
{
$sno = $rec[sno];
$sname = $rec[sname];
$mark = $rec[mark];
$eno = $rec[eno];
$ename = $rec[ename];
$sal = $rec[sal];
echo "<tr><td>$sno</td><td>$sname</td><td>$mark</td>
<td>$eno</td><td>$ename</td><td>$sal</td></tr>";
}
echo "</table>";
echo "sucess"
?>
| Is This Answer Correct ? | 13 Yes | 1 No |
Post New Answer View All Answers
How many functions are there in php?
What type of errors can be occurred in php?
What is the difference between single quoted string and double quoted string?
What is session management php?
Which framework is best for php?
Write a statement to show the joining of multiple comparisons in php?
Why should I store logs in a database rather than a file?
Explain about the $_GET variable of PHP?
How to move uploaded files to permanent directory?
What is put method in php?
What are objects in php?
What is the latest version of php?
What is $_ request?
What is a controller in php?
What is substr() in php? And how it is used?
