How to split row into multiple rows from the MySQL? - php

Question

I have a MySQL data table, in which I have more than 2 columns. First column has a unique value clinical trial value whereas second column has disease information. There are, in most of the cases, more than 2 disease names in one cell for a single id. I want to spilt those rows which cell contains two or more than two diseases. There is a pattern for searching also, i.e. small character is immediately followed by capital character., e.g. MalariaDengueTuberculosis like this. Suppose for these three diseases there is unique id, it should show like the following:
NCT-ID disease
4534343654 Maleria
4534343654 Dengue
4534343654 Tubercoulsosis

Answer 1

If you want to store one or more data in one String column, you could use JSON data formatting.

Answer 2

It is not very clear to me what you're trying to achieve. Since you're using PHP you can try to read the tables using PDO and print the results. For example:
$sql = 'SELECT diseases FROM diseases_info_table';
foreach($pdo->query($sql) as $row) {
$diseases = preg_split('/(?=[A-Z])/', $row['diseases']);
$sql2 = 'SELECT * FROM diseases WHERE disease_name IN ("' . implode('","', $diseases) . '")';
foreach ($pdo->query($sql2) as $row) {
print $row['NCT-ID '] . "\t";
print $row['disease'] . "\t";
}
}
But this way you're generating a lot of queries. If it is possible for you to rethink the database structure than I would recommend doing that.

Answer 3

To answer your question:
If you insist on multi data in one column you can use php explode:
$diseases = explode("|", $row['disease']); //Changing | to whatever separates your diseases.
$diseases is now an array of your diseases which you can do:
foreach ($diseases as $disease)
{
echo $disease;
}
However
Personally I would normalise your database now before trying to hack around solutions. Use an ID against your table and then have a diseases table to link to it. ie:
Main table
NCT-ID
4534343654
5768788544
3i33i3i078
Disease Table
disease_id nct_id disease
1 4534343654 Broken Wind
2 4534343654 Chronic Nosehair
3 4534343654 Corrugated Ankles
4 5768788544 Discrete Itching
5 3i33i3i078 Gastric Ejections
6 3i33i3i078 Bloaty Head
This allows multiple diseases against one nct-id. disease_id would be the primary key.