phpmyadmin一列中有多个值

Question

I would like to ask you, does it possible to create a column in phpmyadmin where I could insert (import) more than one value in one column. As example I create a table with name mytable then added column1 (with value 1) and now i would like to add column2(with values 3 5 8).

When I try to do that it only show column2 with value 3 in it... It ignores 5 and 8.

Answer 1

You can, but don't

Technically a single database field can store multiple values by storing them in a comma-separated string, or a JSON-encoded string. Many newer versions of MySql also support storing complex objects in a Json Datatype , which can hold just about anything. However, it is usually a bad idea to do this, and goes against the intent of a relational database.

Instead consider creating a separate column for each value.

Better, store optional values in another table.

Rather than attempting to define a single column to store varying data, create a new table, which references the rows on the first table. Below is an example of a Many-to-One data relationship which would solve your problem.

table a
-------
id, name, column1
1,  'A',  1
2,  'B',  5

table b
------- 
id, a_id, column2
81, 1,    3
82, 1,    5
83, 1,    8
94, 2,    1
95, 2,    2
96, 2,    3
97, 2,    4
98, 2,    5

By joining these two table, you have a similar result set which is both much more flexible, and sortable/searchable/filterable.

SELECT a.id, a.name, a.column1, b.column2
FROM a
LEFT JOIN b ON a.id = b.a_id

Answer 2

The answer to " can I do it " is "yes" . However, the answer to " should I do it " is " try to find another way " . For example if I have a string like:

$mystring = "1 2 3 4 5";

If I execute a query to insert this into a table column field it will insert it. If this is the only way you can tackle your algorithm then I suggest you insert data values split with / or - so when you retrieve you can explode them and get their values, but I do not suggest doing it this way. Instead, I suggest you to try and find another solution to your problem before you go for this one.