Question

I am trying to build a dynamic query.

This works fine :

$qstring="10000, 10001, 10003, 10005";

SELECT *
FROM orders
WHERE order_id in ($qstring);

This also works fine when I have no data to match and select.

$qstring="";

SELECT *
FROM orders
WHERE order_id in ($qstring);

Does something like below exists to match any data? I checked out the pattern matching for SQL but found nothing that could match everything.

$qstring="*";

SELECT *
FROM orders
WHERE order_id in ($qstring);

Any hints? Thanks!

Answer 1

If you want to match everything just use the select without the where clause.

SELECT * FROM orders

If you’re forced (for some odd reason to use the construct you described) then…

$qstring="SELECT order_id FROM orders";