SQL中的模式匹配

Question

I have a SQL database column for uploaded content Mime types . This column contains string values in the form:

image/jpeg
image/gif
video/mpeg
video/mp4

Is there a SQL query where I can select all rows with the 'image' prefix? Or do I have to hard code each value?

WHERE mime_type IN ('image/png','image/gif', ... )

Hard coding these values will make the script hard to maintain when future mime types are declared. The database already filters on input but adding a new column for grouping is out of my hands.

Answer 1

WHERE mime_type LIKE 'image%'

As simple as that. % acts as a wildcard.

Answer 2

Use the LIKE operator

WHERE mime_type LIKE 'image/%'

http://dev.mysql.com/doc/refman/5.0/en/string-comparison-functions.html#operator_like