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

As SQLite and MySQL follow the same syntax and loose datatypes.

The query below is also possible

SELECT 
   
 , (
     LENGTH(CAST( AS UNSIGNED))
   )
     =
  CASE WHEN CAST( AS UNSIGNED) = 0
  THEN CAST( AS UNSIGNED)
  ELSE (LENGTH()
  ) END AS is_int;

Note the is BNF you would have the replace those values.

This answer is based on mine other answer

Running SQLite demo