How to check if a value is a number in SQLite

Question

I have a column that contains numbers and other string values (like \"?\", \"???\", etc.)

Is it possible to add an \"is number\" condition to the where clause in SQL

Answer 1

You could try something like this also:

select * from mytable where printf("%d", field1) = field1;

In case your column is text and contains numeric and string, this might be somewhat helpful in extracting integer data.

Example:

CREATE TABLE mytable (field1 text);
insert into mytable values (1);
insert into mytable values ('a');

select * from mytable where printf("%d", field1) = field1;
field1
----------
1