SELECT statement for the "length" of the field is greater than 1

Question

I have an LINK field in my table. Some rows have a link, some don't.

I'd like to select all rows where LINK is present. (length is greater than X characters).

How to write this?

Answer 1

select * from [tbl] where [link] is not null and len([link]) > 1

Answer 2

How about:

SELECT * FROM sometable WHERE CHAR_LENGTH(LINK) > 1

Here's the MySql string functions page (5.0).

Note that I chose CHAR_LENGTH instead of LENGTH, as if there are multibyte characters in the data you're probably really interested in how many characters there are, not how many bytes of storage they take. So for the above, a row where LINK is a single two-byte character wouldn't be returned - whereas it would when using LENGTH.

Note that if LINK is NULL, the result of CHAR_LENGTH(LINK) will be NULL as well, so the row won't match.

Answer 3

try:

SELECT
    *
    FROM YourTable
    WHERE CHAR_LENGTH(Link)>x