Question

I have a column named D1_VAL

The rows in this column have data that looks like this:

C:10
R:200
E:3
N:77

I’m trying to do a search on these values with a logical operator. I’ve tried this:

SELECT * FROM d1 WHERE CAST(`D1_VAL` AS UNSIGNED) > 5

It doesn’t return any rows. I’ve also tried:

SELECT * FROM d1 WHERE (0 + `D1_VAL`) > 5

How would I do this properly?

Answer 1

This query will do,

SELECT * FROM d1 WHERE CAST(SUBSTRING(`D1_VAL`, 3) AS UNSIGNED) > 5

But its better to normalize the values like C:10 to two separate columns.

create table d1(
    letter char(1),
    number int,
    // ... other columns
)