How to target specific rows returned by mysqli query - php

Question

Let's say I have a table with following columns: id-1, id-2, col-1, col-2, col-3
Here, id-1 is the primary key and is auto-incremented. id-2 is a different id and is not necessary to be unique. There are multiple instances of same id in that column. col-1, col-2, col-3 are just necessary columns.
I pass a query to select data from the table.
mysqli_query($connect, SELECT * FROM table WHERE id-2='some_specific_id')
It will return multiple rows. I would like to know how can I target specific rows, say row number 3.

Answer 1

First, use ":
mysqli_query($connect, "SELECT * FROM table WHERE id-2 = 'some_specific_id'");
Target specific row? Do you mean to limit the fetched rows? Or get the 3rd row?
For limiting the fetched rows, you can use LIMIT:
SELECT * FROM table WHERE id-2='some_specific_id' LIMIT 3
For getting the third row:
SELECT * FROM table WHERE id-2='some_specific_id' LIMIT 2, 1

Answer 2

Well although it seems you just rather needed to learn basic SQL to get your answer, there is still the question in the title, that may attract other people whose problem is formulated exactly like that. So goes the answer:
Mysqli is not very convenient for this task, so we would use PDO.
In case your query is intended to return multiple rows and you need to address one of them by number (which is rather makes little sense, but anyway), use fetchAll() method:
$stmt = $connect->prepare("SELECT * FROM table WHERE id2=?");
$stmt->execute(['some specific id']);
$data = $stmt->fetchAll();
and you will be able to address returned rows by number, starting from zero:
echo $data[0]['col1'];
However, it makes more sense to address the returned rows by some unique id. In this case just add this unique field fiset in the field list and then use the special PDO street magic:
$stmt = $connect->prepare("SELECT id1, table.* FROM table WHERE id2=?);
$stmt->execute(['some specific id']);
$data = $stmt->fetchAll(PDO::FETCH_UNIQUE);
and you will be able to address returned rows by that unique field :
echo $data[$id1]['col1'];

Answer 3

Use LIMIT to get what you want like:
SELECT * FROM table WHERE id-2='some_specific_id' LIMIT 2, 1;
Or, if you want to fetch from array, then use the 3rd index of array.
LIMIT Explanation:
The following illustrates the LIMIT clause syntax with two arguments:
SELECT
column1,column2,...
FROM
table
LIMIT offset , count;
Let's examine the LIMIT clause parameters:
The offset specifies the offset of the first row to return. The offset of the first row is 0, not 1.
The count specifies the maximum number of rows to return.