MySql find all rows where data contains less than four characters

How would I properly write this sql-english query:

"SELECT zip FROM tblContacts WHERE [the number of characters in zips is less o开发者_如何学Gor equal than 4]".

Thanks.

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Assuming zip is a string:

WHERE CHAR_LENGTH(zip) <= 4

should work.

Edit: originally there was some confusion as to whether the desired comparison was <, <=, or >, but now the Q's been edited to clarify, so I've edited my A accordingly.

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SELECT zip FROM tblContacts WHERE CHAR_LENGTH(zip) > 0

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I'm sure there must be a better way, but...:

SELECT zip FROM tblContacts WHERE zip LIKE '_' OR zip LIKE '__' OR zip LIKE '___' OR zip LIKE '____';