Is there an sql condition that can look for non in

问题:

Basically I would like a select statement that would function like this

SELECT *
FROM table  
WHERE column IS NOT INT  

Is there a condition like this or how do you check for non-integers in an nvarchar(10) column?

回答1:

In SQL Server you can do:

SELECT  *
FROM    mytable  
WHERE   CASE WHEN IsNumeric(mycolumn) = 1 THEN CASE WHEN CAST(mycolumn AS FLOAT) <> CAST(CAST(mycolumn AS FLOAT) AS INT) THEN 1 END ELSE 1 END = 1

回答2:

You could also use

SELECT  *
FROM    T 
WHERE  C = ''
        OR C LIKE '%[^0-9-]%' /*Contains a char other than - or 0-9*/
        OR C LIKE '_%-%'  /*Contains the - char other than 1st position*/