Can I select more tables using this?
$table = "users";
$query = mysql_query("SELECT title, smalltitle, FROM $table ORDER BY date DESC");
while($result= mysql_fetch_array($query))
{
echo'<div id="title"> ';
echo'<p>'.$result['title'].'</p>';
echo'</div>';
echo'<div id="name"> ';
echo'<p>'.$result['name'].'</p>';
echo'</div>';
}
I want title/smalltitle from table "users" and name/text from table "gmsg"
Use this query -
"SELECT users.title, users.smalltitle, gmsg.name FROM users, gmsg $where_condition ORDER BY users.date DESC"
$where_condition would be the condtion to match users & gmsg like -
$where_condition = "users.id = gmsg.user_id"; //Or whatever it is
Yes, with JOIN. Documentation for use JOIN in Mysql here.
Sample:
SELECT * FROM t1 LEFT JOIN (t2, t3, t4)
ON (t2.a=t1.a AND t3.b=t1.b AND t4.c=t1.c)
$table = "users";
$table2 = "gmsg";
$query = mysql_query("SELECT a.title, a.smalltitle, b.name, b.text FROM $table a, $table2 b ORDER BY a.date DESC");
Related
I have about 20 tables in my db, im running query inside a while loop to get all that table data and store data of each table inside an array, looping and everything happens fine but storing part does not happen. can any body help me to store data of each table inside an array
code
while($row = mysql_fetch_array($table_count)){
$table = $row["TABLE_NAME"];
$excute = mysql_query("
SELECT DISTINCT b.ID, name, accountname, c.accountID, status, total_impr, min(a.timestamp), max(a.timestamp)
FROM $table a INNER JOIN bookers b on a.ID = b.ID INNER JOIN accounts c on b.accountID = c.accountID
WHERE a.timestamp > DATE_ADD(NOW(), INTERVAL -1 YEAR)
GROUP BY ID;") or die(mysql_error());
$result = mysql_fetch_assoc($excute);
$tables = array();
$tables .= $result;
}
print_r($tables);
There is little mistake in your syntax in foreach use this
foreach ($table as $tables) {
Correct syntax of forech is
foreach(array_expression as $variable)
{
}
Update====
$tables = array();
$i=0;
while($row = mysql_fetch_array($table_count))
{
$table = $row["TABLE_NAME"];
$excute = mysql_query("
SELECT DISTINCT b.ID, name, accountname, c.accountID, status, total_impr, min(a.timestamp), max(a.timestamp)
FROM $table a INNER JOIN bookers b on a.ID = b.ID INNER JOIN accounts c on b.accountID = c.accountID
WHERE a.timestamp > DATE_ADD(NOW(), INTERVAL -1 YEAR)
GROUP BY ID;") or die(mysql_error());
while($finalRes = mysql_fetch_assoc($excute))
{
$tables[$i][] = $finalRes;
}
$i++;
}
echo '<pre>';
print_r($tables);
And you are using this wrongly.
How can I achieve the following using only one database query?
$query = "SELECT `email`, `name` FROM `customers`";
$result = mysqli_query($link,$customer_query);
while($row = mysqli_fetch_array($result)){
echo "<p>".$row['name']."</p>";
echo "<ul>";
$query2 = "SELECT `sku` FROM `orders` WHERE `email` = '".$row['email']."'";
$result2 = mysqli_query($link,$query2);
while($row2 = mysqli_fetch_array($result2)){
echo "<li>".$row2['sku']."</li>";
echo "<li>".$row2['cost']."</li>";
}
echo "</ul>"
}
Use INNER JOIN on email field for this:
SELECT c.name, o.sku, o.cost FROM customers c INNER JOIN orders o ON o.email = c.email
Don't forget to add MySQL INDEX on email field for performance.
But this only select customers which have orders.
If you need to select all customers (even which does not have orders) use LEFT JOIN instead. In this case sku and cost fields for users without orders will be null.
Use this picture as hint for this.
Im working on a message board of some sort and i have everything up an running except one little part, the threads need to be sorted by the date/time of the latest post in them (standard forum format), which im having lots of trouble wrapping my head around.
This is the querys im using, i know its not pretty and its not safe, i will be reworking them once i learn how to do it properly.
$sql = "SELECT Thread_ID, Thread_Title, Board_ID, Author FROM threads WHERE Board_ID='$Board_ID' LIMIT $offset, $rowsperpage";
$result = mysql_query($sql, $conn) or trigger_error("SQL", E_USER_ERROR);
while ($row = mysql_fetch_assoc($result))
{
$Thread_ID = $row['Thread_ID'];
$Thread_Title = $row['Thread_Title'];
$Board_ID = $row['Board_ID'];
$Author = $row['Author'];
$getauthor = mysql_query("SELECT * FROM members WHERE Member_ID='$Author'");
while ($row = mysql_fetch_assoc($getauthor))
{
$Post_Author = $row['Post_As']; }
$postcount = mysql_query("SELECT Post_ID FROM posts WHERE Thread_ID='$Thread_ID'");
$Posts = mysql_num_rows($postcount);
$getlatest = mysql_query("SELECT * FROM posts WHERE Thread_ID='$Thread_ID' ORDER by Post_DateTime DESC LIMIT 1");
while ($row = mysql_fetch_assoc($getlatest))
{
$Post_DateTime = time_ago($row['Post_DateTime']);
$Member_ID = $row['Member_ID']; }
$getmember = mysql_query("SELECT * FROM members WHERE Member_ID='$Member_ID'");
while ($row = mysql_fetch_assoc($getmember))
{
$Post_As = $row['Post_As']; }
So what im trying to do is Sort $sql by $getlatest, i tried adding another query above $sql that did basically the same as $getlatest and then had $sql order by that but alas it just broke everything.
I know i have to make a variable to sort the $sql by but its that variable thats driving me mad.
any help would be appreciated, thanks.
current error message as requested:
Fatal error: SQL - Unknown column 'posts2.LatestPost' in 'on clause' - SELECT threads.Thread_ID, threads.Thread_Title, threads.Board_ID, threads.Author, Sub1.LatestPost, Sub1.PostCount, members.Post_As, members2.Member_ID AS LastPostMemberID, members2.Post_As AS LastPostMemberPostAs FROM threads INNER JOIN (SELECT Thread_ID, MAX(posts.Post_DateTime) AS LatestPost, COUNT(*) AS PostCount FROM posts GROUP BY Thread_ID) Sub1 ON threads.Thread_ID = Sub1.Thread_ID INNER JOIN members ON threads.Author = members.Member_ID INNER JOIN posts posts2 ON posts2.Thread_ID = Sub1.Thread_ID AND posts2.LatestPost INNER JOIN members members2 ON members2.Member_ID = posts2.Member_ID WHERE threads.Board_ID='1' ORDER BY Sub1.LatestPost DESC LIMIT 0, 25 in C:\wamp\www\forum\include\threads.php on line 86
You should be able to do it using something like this for your first query:-
$sql = "SELECT threads.Thread_ID, threads.Thread_Title, threads.Board_ID, threads.Author, MAX(posts.Post_DateTime) AS LatestPost
FROM threads
LEFT OUTER JOIN posts ON threads.Thread_ID = posts.Thread_ID
WHERE threads.Board_ID='$Board_ID'
GROUP BY SELECT threads.Thread_ID, threads.Thread_Title, threads.Board_ID, threads.Author
ORDER BY LatestPost DESC
LIMIT $offset, $rowsperpage";
EDIT
Not tested the following but looking at your selects I think you could probably put it together into a single SELECT. Something like this:-
$sql = "SELECT threads.Thread_ID, threads.Thread_Title, threads.Board_ID, threads.Author, Sub1.LatestPost, Sub1.PostCount, members.Post_As, members2.Member_ID AS LastPostMemberID, members2.Post_As AS LastPostMemberPostAs
FROM threads
INNER JOIN (SELECT Thread_ID, MAX(posts.Post_DateTime) AS LatestPost, COUNT(*) AS PostCount FROM posts GROUP BY Thread_ID) Sub1
ON threads.Thread_ID = Sub1.Thread_ID
INNER JOIN members
ON threads.Author = members.Member_ID
INNER JOIN posts posts2
ON posts2.Thread_ID = Sub1.Thread_ID AND posts2.Post_DateTime = Sub1.LatestPost
INNER JOIN members members2
ON members2.Member_ID = posts2.Member_ID
WHERE threads.Board_ID='$Board_ID'
ORDER BY Sub1.LatestPost DESC
LIMIT $offset, $rowsperpage";
$result = mysql_query($sql, $conn) or trigger_error("SQL", E_USER_ERROR);
while ($row = mysql_fetch_assoc($result))
{
$Thread_ID = $row['Thread_ID'];
$Thread_Title = $row['Thread_Title'];
$Board_ID = $row['Board_ID'];
$Author = $row['Author'];
$Post_Author = $row['Post_As'];
$Posts = $row['PostCount'];
$Post_DateTime = time_ago($row['LatestPost']);
$Member_ID = $row['LastPostMemberID'];
$Post_As = $row['LastPostMemberPostAs'];
How can I grab the count value from the query MySQL query below using PHP.
Here is My MySQL code.
$dbc = mysqli_query($mysqli,"SELECT COUNT(*) FROM((SELECT users_friends.id
FROM users_friends
INNER JOIN users ON users_friends.user_id = users.user_id
WHERE users_friends.user_id = 1
AND users_friends.friendship_status = '1')
UNION
(SELECT users_friends.id
FROM users_friends
INNER JOIN users ON users_friends.friend_id = users.user_id
WHERE users_friends.friend_id = 1
AND users_friends.friendship_status = '1')) as friends");
using SQL_CALC_FOUND_ROWS should simplify things:
$dbc = mysqli_query($mysqli,"SELECT SQL_CALC_FOUND_ROWS users_friends.id
FROM users_friends
INNER JOIN users ON users_friends.user_id = users.user_id
WHERE users_friends.user_id = 1
AND users_friends.friendship_status = '1'
");
then afterwards do
$rs = mysqli_query($mysqli, "SELECT FOUND_ROWS()"));
$rec = $rs->fetch_array();
$count = $rec[0];
This method will return the number of records that match the query, ignoring any LIMIT statement, whereas using $rs->num_rows will only give you the number of records actually returned. Depends which one you want.
if ($result = mysqli_query($link, "SELECT Name FROM City LIMIT 10")) {
printf("Select returned %d rows.\n", mysqli_num_rows($result));
/* free result set */
mysqli_free_result($result);
http://us.php.net/manual/en/mysqli.query.php
Assuming that you are correctly connected to the MySQL server and your query are executed correctly, you can use the following code:
$values = mysql_fetch_row($dbc);
$count = $values[0];
Your query should look like SELECT COUNT(*) as numThings FROM xxx
The numThings is what you will reference in PHP:
$result = mysql_query("SELECT COUNT(*) as `numThings` FROM xxx");
$row = mysql_fetch_assoc($result);
$count = $row['numThings'];
I want to do the following but in one query:
$query = mysql_query("SELECT name FROM tbl_users WHERE category = '1'");
while($row = mysql_fetch_assoc($query))
{
$query2 = mysql_query("SELECT datecreated
FROM tbl_comments
ORDER BY datecreated DESC LIMIT 1");
$row2 = mysql_fetch_assoc($query2);
echo $row['name'] . " > " . $row2['datecreated'] ."<br />";
}
There is a user table and a comments table, I want to display a list of users and the date of the last comment next to them?
Is this possible in a single query?
You can do so using the following SQL:
SELECT name,
(
SELECT datecreated
FROM tbl_comments
WHERE tbl_users.user_id = tbl_comments.user_id
ORDER BY datecreated LIMIT 1
)
FROM tbl_users
WHERE category = '1';
OR using:
SELECT tbl_users.name, MAX(datecreated) AS latestcomment
FROM tbl_users LEFT JOIN tbl_comments ON (tbl_users.user_id = tbl_comments.user_id)
GROUP BY tbl_users.name;