contains

Basically I want to check whether a mysql text column, which contains comma-separated values, contains any of the values contained in an array. I know this can be done with a loop and multiple queries, but I was hoping for a single query. Is this possible? Thank you. I would use a solution like this: SELECT * FROM yourtable WHERE str RLIKE CONCAT('[[:<:]]', REPLACE('values,in,the,array', ',', '[[:>:]]|[[:<:]]'), '[[:>:]]') this will make the following string: 'values,in,the,array' like this: [[:<:]]values[[:>:]]|[[:<:]]in[[:>:]]|[[:<:]]the[[:>:]]|[[:<:]]array[[:>:]] [[:<:]] and [[:>:]] are

I'm looking for the CouchDB JS view equivalent of the following LinQ query : var query = from f in context.Feed where !(from ds in context.DataSource select ds.Feed_ID) .Contains(f.ID) select f; Where DataSources have a foreign key to Feeds. In a word : get all Feeds not associated with a DataSource Thank you You can use the view collation to join feeds and data sources in map: function(doc) { if (!doc.type) return; if (doc.type == "feed") emit(doc._id, null); if (doc.type == "ds" && doc.feed) emit(doc.feed, null); } and reduce to filter those feed ids which have data source documents linking

Does the __contains__ method of a list class check whether an object itself is an element of a list, or does it check whether the list contains an element equivalent to the given parameter? Could you give me an example to demonstrate? >>> a = [[]] >>> b = [] >>> b in a True >>> b is a[0] False This proves that it is a value check (by default at least), not an identity check. Keep in mind though that a class can if desired override __contains__() to make it an identity check. But again, by default, no. It depends on the class how it does the check. For the builtin list it uses the == operator;