Question

Is there an alternative for this?

This is my code

function loadQ() {
   db.transaction(function(t) {
     t.executeSql('SELECT * FROM q ORDER BY RAND()', [], qDataHandler, errorHandler);
   });
};

Now, this doesn’t work. It works if I remove the Rand() and replace it with LIMIT 1. But I want the result to be randomized.

I am thinking of running a query for a total rows and then create a function that picks numbers from 0 to total rows and then use the result in my loadQ as ID. But i think this is a tedious work. Am wondering if you have any better ideas for this?

many thanks.

Answer 1

If you use the random value as the PK, it’ll fail if you have gaps in your rows.

Here’s a better solution:

1. Query for a COUNT() of rows.

2. Generate a random number from 0 to the count

3. Use the result in LIMIT 1 OFFSET ?