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SQL and php to count rows and in a table and summarize in another table

Posted on 2014-03-07
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Last Modified: 2014-03-07
Hi,

I have this table

cars
dogs
cars
dogs
cats
tables
electronics
tables
tables
electronics

and so on...

I need a query and  php code to give a table that presents the unique values and count how many exists of each of them, like a pivot table in excel

cars              2
dogs             2
cats              1
tables           3
electronics  2  

any idea?
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Question by:joyacv2
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4 Comments
 
LVL 110

Expert Comment

by:Ray Paseur
ID: 39913068
I think you can use a GROUP BY with COUNT()
0
 
LVL 110

Accepted Solution

by:
Ray Paseur earned 500 total points
ID: 39913093
http://www.iconoun.com/demo/temp_joyacv2.php

See the query on line 117

<?php // temp_joyacv2.php
ini_set('display_errors', TRUE);
error_reporting(E_ALL);
echo '<pre>';


// CREATE AN ARRAY OF NAMES TO USE FOR TEST DATA
$test_names_arrays = array
( 'cars'
, 'dogs'
, 'cars'
, 'dogs'
, 'cats'
, 'tables'
, 'electronics'
, 'tables'
, 'tables'
, 'electronics'
)
;


// DATABASE CONNECTION AND SELECTION VARIABLES - GET THESE FROM YOUR HOSTING COMPANY
$db_host = "localhost"; // PROBABLY THIS IS OK
$db_name = "??";
$db_user = "??";
$db_word = "??";

// OPEN A CONNECTION TO THE DATA BASE SERVER AND SELECT THE DB
$mysqli = new mysqli($db_host, $db_user, $db_word, $db_name);

// DID THE CONNECT/SELECT WORK OR FAIL?
if ($mysqli->connect_errno)
{
    $err
    = "CONNECT FAIL: "
    . $mysqli->connect_errno
    . ' '
    . $mysqli->connect_error
    ;
    trigger_error($err, E_USER_ERROR);
}

// ACTIVATE THIS TO SHOW WHAT THE DB CONNECTION OBJECT LOOKS LIKE
// var_dump($mysqli);


// CREATING A TABLE FOR OUR TEST DATA
$sql
=
"
CREATE TEMPORARY TABLE my_table
( id    INT         NOT NULL AUTO_INCREMENT PRIMARY KEY
, fname VARCHAR(24) NOT NULL DEFAULT ''
)
"
;

// RUN THE QUERY TO CREATE THE TABLE
$res = $mysqli->query($sql);

// IF mysqli::query() RETURNS FALSE, LOG AND SHOW THE ERROR
if (!$res)
{
    $err
    = 'QUERY FAILURE:'
    . ' ERRNO: '
    . $mysqli->errno
    . ' ERROR: '
    . $mysqli->error
    . ' QUERY: '
    . $sql
    ;
    trigger_error($err, E_USER_ERROR);
}

// SHOW THE RESULTS OF THE QUERY
var_dump($res);


// LOADING OUR DATA INTO THE TABLE
foreach ($test_names_arrays as $fname)
{
    // ESCAPE THE DATA FOR SAFE USE IN A QUERY
    $safe_fn  = $mysqli->real_escape_string($fname);

    // CONSTRUCT THE QUERY USING THE ESCAPED VARIABLES
    $sql = "INSERT INTO my_table ( fname ) VALUES ( '$safe_fn' )";

    // RUN THE QUERY TO INSERT THE ROW
    $res = $mysqli->query($sql);

    // IF mysqli::query() RETURNS FALSE, LOG AND SHOW THE ERROR
    if (!$res)
    {
        $err
        = 'QUERY FAILURE:'
        . ' ERRNO: '
        . $mysqli->errno
        . ' ERROR: '
        . $mysqli->error
        . ' QUERY: '
        . $sql
        ;
        trigger_error($err, E_USER_ERROR);
    }


    // GET THE AUTO_INCREMENT ID OF THE RECORD JUST INSERTED
    $id  = $mysqli->insert_id;
    echo "MySQLI INSERTED A ROW CONTAINING <b>$safe_fn</b> WITH AUTO_INCREMENT ID = $id" . PHP_EOL;
}
echo PHP_EOL;


// CONSTRUCT THE QUERY
$sql = "SELECT fname, COUNT(id) as num FROM my_table GROUP BY fname ORDER BY fname";
$res = $mysqli->query($sql);

// IF mysqli_query() RETURNS FALSE, LOG AND SHOW THE ERROR
if (!$res)
{
    $err
    = 'QUERY FAILURE:'
    . ' ERRNO: '
    . $mysqli->errno
    . ' ERROR: '
    . $mysqli->error
    . ' QUERY: '
    . $sql
    ;
    trigger_error($err, E_USER_ERROR);
}
// IF WE GET THIS FAR, THE QUERY SUCCEEDED AND WE HAVE A RESULT OBJECT IN $res
// AND SO WE CAN NOW USE $res IN OTHER MYSQLI FUNCTIONS

// ITERATE OVER THE RESULTS SET AS AN OBJECT TO SHOW WHAT WE FOUND
echo PHP_EOL . 'USING MySQLi_Result::Fetch_<i>Object</i>(): ';
echo PHP_EOL;
while ($row = $res->fetch_object())
{
    // ROW BY ROW PROCESSING IS DONE HERE
    print_r($row);
    echo PHP_EOL;
}
echo PHP_EOL;

Open in new window

HTH, ~Ray
0
 
LVL 1

Author Closing Comment

by:joyacv2
ID: 39913183
works perfect!!!!!
0
 
LVL 110

Expert Comment

by:Ray Paseur
ID: 39913394
Thanks for the points.  Here is line 117 deconstructed:

/* Get me the column named fname and the count of the id column.  Name the count "num" in the results set */
SELECT fname, COUNT(id) as num FROM my_table

/* Group all matching fname columns together, and order the results set alphabetically */
GROUP BY fname ORDER BY fname


Best regards, ~Ray
0

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