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

To test whether the column contains exclusively an integer with no other alphanumeric characters, use:

NOT myColumn GLOB '*[^0-9]*' AND myColumn LIKE '_%'

I.e., we test whether the column contains anything else than a digit and invert the result. Additionally we test whether it contains at least one character.

Note that GLOB '*[0-9]*' will find digits nested between other characters as well. The function typeof() will return 'text' for a column typed as TEXT, even if the text represents a number. As @rayzinnz mentioned, the abs() function is not reliable as well.

Answer 2

SELECT * 
FROM mytable
WHERE columnNumeric  GLOB '*[0-9]*'

Answer 3

select * from mytable where abs(mycolumn) <> 0.0 or mycolumn = '0'

http://sqlfiddle.com/#!5/f1081/2

Based on this answer